Class 10th Science Chapter 7 – How Do Organisms Reproduce? | Reproductive Parts of a Flower

🌸 How Do Organisms Reproduce?

Reproductive Parts of a Flower | पुष्प के जनन भाग

Class 10 Science | CBSE + Foundation + Competitive

🌺 Reproductive Parts of a Flower | पुष्प के जनन भाग

1. Introduction to Reproductive Parts of a Flower

English:
A flower is the reproductive structure of a flowering plant. It contains specialised reproductive organs that take part in sexual reproduction. The male reproductive part is the stamen, while the female reproductive part is the pistil or carpel.

हिन्दी:
फूल (Flower) पुष्पीय पौधों की जनन संरचना है। इसमें ऐसे विशेष जनन अंग पाए जाते हैं जो लैंगिक जनन में भाग लेते हैं। फूल का नर जनन भाग पुंकेसर (Stamen) तथा मादा जनन भाग स्त्रीकेसर/कार्पेल (Pistil/Carpel) कहलाता है।

Flower → Male Reproductive Part + Female Reproductive Part
फूल → नर जनन भाग + मादा जनन भाग

2. Structure of a Typical Flower – Labelled Diagram

Diagram Focus: Stamen + Pistil are the main reproductive parts.

3. Four Main Parts / Whorls of a Flower

Part / भाग	Main Structure / मुख्य संरचना	Function / कार्य
Sepals / बाह्यदल	Calyx	Protect the developing flower bud / कली की सुरक्षा
Petals / पंखुड़ियाँ	Corolla	Attract pollinators / परागणकर्ताओं को आकर्षित करना
Stamen / पुंकेसर	Filament + Anther	Male reproductive part; produces pollen / नर जनन भाग, परागकण बनाता है
Pistil/Carpel / स्त्रीकेसर	Stigma + Style + Ovary	Female reproductive part / मादा जनन भाग

4. Stamen – Male Reproductive Part

English:
The stamen is the male reproductive part of a flower. It consists of two main parts:

1. Filament – a thin stalk that supports the anther.
2. Anther – produces pollen grains containing the male reproductive cells/gametophytes.

हिन्दी:
पुंकेसर (Stamen) फूल का नर जनन भाग है। इसके दो मुख्य भाग होते हैं:

1. तंतु (Filament) – परागकोष को सहारा देने वाला पतला डंठल।
2. परागकोष (Anther) – परागकण उत्पन्न करता है।

Stamen = Filament + Anther
पुंकेसर = तंतु + परागकोष

CBSE Point: Anther is the part of the stamen that produces pollen grains.
महत्वपूर्ण: परागकण परागकोष (Anther) में बनते हैं।

5. Pollen Grains – परागकण

English:
Pollen grains are tiny structures produced in the anther. They carry the male reproductive cells. During pollination, pollen grains are transferred from the anther to the stigma.

हिन्दी:
परागकण परागकोष में बनने वाली सूक्ष्म संरचनाएँ हैं। इनमें नर जनन कोशिकाएँ होती हैं। परागण के समय परागकण परागकोष से वर्तिकाग्र तक पहुँचते हैं।

Anther → Pollen Grain → Stigma → Pollen Tube → Ovule
परागकोष → परागकण → वर्तिकाग्र → परागनलिका → बीजांड

6. Pistil / Carpel – Female Reproductive Part

English:
The pistil or carpel is the female reproductive part of a flower. It generally consists of three parts:

1. Stigma – sticky surface that receives pollen grains.
2. Style – slender stalk connecting stigma with ovary.
3. Ovary – swollen basal part containing ovules.

हिन्दी:
स्त्रीकेसर/कार्पेल फूल का मादा जनन भाग है। इसके तीन मुख्य भाग होते हैं:

1. वर्तिकाग्र (Stigma) – परागकणों को ग्रहण करता है।
2. वर्तिका (Style) – वर्तिकाग्र को अंडाशय से जोड़ती है।
3. अंडाशय (Ovary) – इसमें बीजांड पाए जाते हैं।

Pistil = Stigma + Style + Ovary
स्त्रीकेसर = वर्तिकाग्र + वर्तिका + अंडाशय

7. Functions of Different Floral Parts

Structure	Function
Sepal / बाह्यदल	Protects the flower bud.
Petal / पंखुड़ी	Often attracts insects and other pollinators.
Filament / तंतु	Supports the anther.
Anther / परागकोष	Produces pollen grains.
Stigma / वर्तिकाग्र	Receives pollen grains.
Style / वर्तिका	Provides a pathway for pollen tube growth.
Ovary / अंडाशय	Contains ovules.
Ovule / बीजांड	Contains the female reproductive structure; after fertilisation it generally develops into a seed.

8. Male vs Female Reproductive Parts

Male Part / नर भाग	Female Part / मादा भाग
Stamen / पुंकेसर	Pistil/Carpel / स्त्रीकेसर
Filament + Anther	Stigma + Style + Ovary
Anther produces pollen	Ovary contains ovules
Associated with male gametes	Associated with female gamete

9. Pollination and Reproductive Parts

Pollination / परागण:
English: Pollination is the transfer of pollen grains from the anther to the stigma of a flower. हिन्दी: परागण वह प्रक्रिया है जिसमें परागकण परागकोष से वर्तिकाग्र तक पहुँचते हैं।

Anther → Pollen → Stigma
परागकोष → परागकण → वर्तिकाग्र

Types of Pollination:

• Self-pollination: Pollen reaches the stigma of the same flower or another flower on the same plant.
• Cross-pollination: Pollen is transferred to a flower on another plant of the same species.

परागण के प्रकार:

• स्व-परागण: उसी फूल या उसी पौधे के दूसरे फूल के वर्तिकाग्र तक परागकण पहुँचना।
• पर-परागण: उसी प्रजाति के दूसरे पौधे के फूल तक परागकण पहुँचना।

10. From Pollination to Fertilisation

After a pollen grain reaches the stigma, it may germinate and form a pollen tube. The pollen tube grows through the style towards the ovary and reaches an ovule. The male gamete is delivered to the female reproductive structure where fertilisation can occur.

परागकण वर्तिकाग्र पर पहुँचने के बाद अंकुरित होकर परागनलिका बनाता है। परागनलिका वर्तिका से होकर अंडाशय की ओर बढ़ती है और बीजांड तक पहुँचती है। नर युग्मक मादा जनन संरचना तक पहुँचता है जहाँ निषेचन होता है।

Male Gamete + Female Gamete → Zygote
नर युग्मक + मादा युग्मक → युग्मनज

11. Animated Pollen Tube Pathway

12. Changes After Fertilisation

Before Fertilisation	After Fertilisation
Male + Female gametes	Zygote
Zygote	Embryo
Ovule / बीजांड	Seed / बीज
Ovary / अंडाशय	Fruit / फल – generally

Golden Point:
Ovule generally develops into a seed, while the ovary generally develops into a fruit after fertilisation.

13. Bisexual and Unisexual Flowers

Bisexual Flower / उभयलिंगी फूल:
A flower containing both stamens and pistil is called a bisexual flower.

Examples: Hibiscus, mustard.

Unisexual Flower / एकलिंगी फूल:
A flower containing either stamens or pistil is called a unisexual flower.

Examples: Papaya, watermelon.

14. Advanced Concept – Double Fertilisation

In flowering plants, two male gametes are involved in a special process called double fertilisation.

• One male gamete fuses with the egg → Zygote.
• The other male gamete fuses with the polar nuclei → Primary endosperm nucleus.

This is a characteristic feature of flowering plants (angiosperms).

Male Gamete 1 + Egg → Zygote
Male Gamete 2 + Polar Nuclei → Endosperm

15. Pollination vs Fertilisation

Pollination	Fertilisation
Transfer of pollen from anther to stigma.	Fusion of male and female gametes.
Occurs before fertilisation.	Occurs after successful pollen delivery.
Does not form a zygote.	Forms a zygote.
Involves pollen transfer.	Involves gamete fusion.

16. 30 MCQs – CBSE + Foundation + Competitive

Q1. Which is the male reproductive part of a flower?

A) Pistil

B) Stamen

C) Ovary

D) Stigma

Answer: B

The stamen is the male reproductive part of a flower.

Q2. A stamen consists of:

A) Stigma and style

B) Ovary and ovule

C) Filament and anther

D) Petal and sepal

Answer: C

Stamen = filament + anther.

Q3. Which part produces pollen grains?

A) Anther

B) Stigma

C) Ovary

D) Style

Answer: A

Q4. The female reproductive part of a flower is:

A) Stamen

B) Filament

C) Anther

D) Pistil

Answer: D

Q5. Which part of the pistil receives pollen grains?

A) Ovary

B) Stigma

C) Style

D) Ovule

Answer: B

Q6. The ovary contains:

A) Sepals

B) Petals

C) Ovules

D) Anthers

Answer: C

Q7. The transfer of pollen from anther to stigma is called:

A) Pollination

B) Fertilisation

C) Germination

D) Fragmentation

Answer: A

Q8. The stalk connecting stigma and ovary is called:

A) Filament

B) Anther

C) Sepal

D) Style

Answer: D

Q9. Which structure develops into a seed generally after fertilisation?

A) Petal

B) Ovule

C) Stigma

D) Filament

Answer: B

Q10. The ovary generally develops into:

A) Pollen

B) Embryo

C) Fruit

D) Anther

Answer: C

Q11. A flower containing both stamen and pistil is called:

A) Bisexual

B) Unisexual

C) Vegetative

D) Asexual

Answer: A

Q12. Which is an example of a unisexual flower?

A) Hibiscus

B) Mustard

C) Rose

D) Papaya

Answer: D

Q13. Which part supports the anther?

A) Style

B) Filament

C) Stigma

D) Ovary

Answer: B

Q14. Which structure carries the pollen tube towards the ovary?

A) Petal

B) Sepal

C) Style

D) Filament

Answer: C

Q15. Fusion of male and female gametes produces:

A) Zygote

B) Pollen grain

C) Ovule

D) Anther

Answer: A

Q16. Which part often attracts insects towards a flower?

A) Ovary

B) Style

C) Filament

D) Petal

Answer: D

Q17. Which of the following is NOT a part of pistil?

A) Stigma

B) Anther

C) Style

D) Ovary

Answer: B

Q18. Which sequence is correct?

A) Anther → Pollen → Stigma

B) Ovary → Pollen → Anther

C) Stigma → Petal → Pollen

D) Style → Anther → Sepal

Answer: A

Q19. Cross-pollination occurs between:

A) Different species only

B) Roots of plants

C) Different plants of the same species

D) Leaves of the same plant

Answer: C

Q20. The female gamete in a flowering plant is associated with the:

A) Anther

B) Ovule

C) Filament

D) Petal

Answer: B

Q21. What is the correct order after pollination?

A) Pollen germination → pollen tube growth → fertilisation

B) Fertilisation → pollination → pollen tube

C) Seed → pollen → fertilisation

D) Ovary → anther → stigma

Answer: A

Q22. A flower having only stamens is:

A) Bisexual

B) Complete

C) Perfect

D) Unisexual

Answer: D

Q23. Which floral part protects the flower bud?

A) Petal

B) Stigma

C) Sepal

D) Anther

Answer: C

Q24. Double fertilisation is characteristic of:

A) Flowering plants

B) All bacteria

C) Fungi only

D) All algae

Answer: A

Q25. In double fertilisation, one male gamete fuses with:

A) Petal

B) Egg

C) Sepal

D) Filament

Answer: B

Q26. The pollen tube normally grows through the:

A) Petal

B) Sepal

C) Filament

D) Style

Answer: D

Q27. Which statement is correct?

A) Pollination is fusion of gametes.

B) Fertilisation is transfer of pollen.

C) Pollination precedes fertilisation.

D) Stamen contains ovules.

Answer: C

Q28. Which combination is correctly matched?

A) Anther – pollen production

B) Ovary – pollen production

C) Stigma – ovule production

D) Filament – female gamete production

Answer: A

Q29. The zygote develops into:

A) Pollen

B) Embryo

C) Anther

D) Stigma

Answer: B

Q30. Which statement best describes the role of stigma?

A) Produces ovules

B) Produces petals

C) Supports the anther

D) Receives pollen grains

Answer: D

17. 30 Subjective Questions with Answers

2 Marks Q1. What is a flower?

Answer: A flower is the reproductive structure of a flowering plant. It contains male and/or female reproductive parts.

2 Marks Q2. Name the male reproductive part of a flower and its two components.

Answer: The male reproductive part is the stamen. It consists of filament and anther.

2 Marks Q3. Name the three parts of the pistil.

Answer: Stigma, style and ovary.

2 Marks Q4. What is the function of anther?

Answer: Anther produces pollen grains containing the male reproductive cells.

2 Marks Q5. What are ovules?

Answer: Ovules are structures present inside the ovary. They contain the female reproductive structure and generally develop into seeds after fertilisation.

3 Marks Q6. Differentiate between stamen and pistil.

Answer:
Stamen is the male reproductive part and consists of filament and anther. Pistil is the female reproductive part and consists of stigma, style and ovary.

3 Marks Q7. Write three functions of different floral parts.

Answer:

1. Sepals protect the flower bud.
2. Petals often attract pollinators.
3. Anther produces pollen grains.

3 Marks Q8. What is pollination? Name its two types.

Answer: Pollination is the transfer of pollen from anther to stigma. Its two types are self-pollination and cross-pollination.

3 Marks Q9. Explain the role of stigma, style and ovary.

Answer: Stigma receives pollen, style provides a pathway for pollen tube growth and ovary contains ovules.

3 Marks Q10. What happens to ovule and ovary after fertilisation?

Answer: The ovule generally develops into a seed and the ovary generally develops into a fruit.

4 Marks Q11. Explain the structure of a stamen.

Answer: The stamen consists of:

1. Filament – slender stalk.
2. Anther – terminal part.
3. The filament supports the anther.
4. The anther produces pollen grains.

4 Marks Q12. Explain the structure of pistil.

Answer: The pistil has three main parts:

1. Stigma – receives pollen.
2. Style – connects stigma with ovary.
3. Ovary – contains ovules.
4. After fertilisation, ovules generally become seeds.

4 Marks Q13. Explain the process from pollen deposition to fertilisation.

Answer: Pollen lands on stigma → pollen germinates → pollen tube grows through style → reaches ovule → male gamete is delivered → fusion with female gamete forms zygote.

4 Marks Q14. Differentiate between self-pollination and cross-pollination.

Answer: Self-pollination occurs within the same flower or same plant. Cross-pollination occurs between flowers on different plants of the same species.

4 Marks Q15. What are bisexual and unisexual flowers? Give examples.

Answer: A bisexual flower contains both stamen and pistil, e.g. hibiscus. A unisexual flower contains either stamens or pistil, e.g. papaya.

5 Marks Q16. Explain the four main whorls of a flower.

Answer:

1. Sepals – protect the developing bud.
2. Petals – often attract pollinators.
3. Stamens – male reproductive structures.
4. Pistil/carpel – female reproductive structure.

5 Marks Q17. Describe the reproductive role of stamen.

Answer: The stamen consists of filament and anther. Filament supports anther. Anther produces pollen grains. Pollen grains carry male reproductive cells and are transferred to stigma during pollination.

5 Marks Q18. Explain the reproductive role of pistil.

Answer: Pistil consists of stigma, style and ovary. Stigma receives pollen, style provides a route for pollen tube and ovary contains ovules. Fertilisation occurs in association with the ovule, leading to zygote formation.

5 Marks Q19. Explain pollination and fertilisation in flowering plants.

Answer: Pollination is pollen transfer from anther to stigma. The pollen germinates and forms a pollen tube. The tube grows through the style to an ovule. Male and female gametes fuse to form a zygote. This fusion is fertilisation.

5 Marks Q20. Explain the changes occurring after fertilisation.

Answer: The zygote develops into an embryo. The ovule generally develops into a seed and the ovary generally develops into a fruit. Other floral parts may wither depending on the plant.

6 Marks Q21. Draw and explain the reproductive parts of a typical flower.

Answer: The main reproductive parts are stamen and pistil. Stamen has filament and anther. Pistil has stigma, style and ovary. Anther produces pollen grains, while ovary contains ovules. The stigma receives pollen and the pollen tube grows through the style towards an ovule.

6 Marks Q22. Explain the complete pathway from anther to zygote.

Answer: Anther produces pollen → pollen reaches stigma → pollen germinates → pollen tube develops → pollen tube grows through style → reaches ovule → male gamete reaches female reproductive structure → fusion occurs → zygote is formed.

6 Marks Q23. Explain the structure and functions of stamen and pistil in detail.

Answer: Stamen is the male part and consists of filament and anther. Anther produces pollen grains. Pistil is the female part and consists of stigma, style and ovary. Stigma receives pollen, style provides a route for pollen tube and ovary contains ovules.

6 Marks Q24. Explain self-pollination and cross-pollination with differences.

Answer: Self-pollination occurs within the same flower or same plant. Cross-pollination occurs between flowers on different plants of the same species. Cross-pollination generally promotes greater genetic variation than self-pollination.

6 Marks Q25. Why is a flower called the reproductive structure of a flowering plant?

Answer: A flower contains reproductive organs. The stamen produces pollen carrying male reproductive cells, while the pistil contains ovules associated with female reproduction. Pollination and fertilisation occur through these structures, leading to seed formation.

6 Marks Q26. Explain double fertilisation in flowering plants.

Answer: Two male gametes participate. One fuses with the egg to form the zygote. The second fuses with the polar nuclei to form the primary endosperm nucleus. This process is called double fertilisation and is characteristic of flowering plants.

6 Marks Q27. Differentiate between pollination and fertilisation.

Answer: Pollination is transfer of pollen from anther to stigma. Fertilisation is fusion of male and female gametes. Pollination precedes fertilisation and does not itself form a zygote. Fertilisation results in zygote formation.

6 Marks Q28. Explain how pollen reaches the female reproductive structure.

Answer: Pollen grains are produced in anthers. During pollination, they are transferred to the stigma. A compatible pollen grain germinates on the stigma and forms a pollen tube. The pollen tube grows through the style and reaches an ovule in the ovary.

6 Marks Q29. Explain the role of ovary and ovule in reproduction.

Answer: The ovary is the swollen basal part of the pistil and contains ovules. The ovule contains the female reproductive structure. After fertilisation, the ovule generally becomes a seed and the ovary generally becomes a fruit.

6 Marks Q30. Describe the reproductive sequence of a flowering plant from flower formation to seed development.

Answer: Flower develops → anther produces pollen → pollen reaches stigma → pollen tube grows → male gamete reaches ovule → fertilisation occurs → zygote forms → embryo develops → ovule becomes seed → ovary generally becomes fruit.

18. HOTS / Competency-Based Questions

HOTS 1. A flower has stamens but no pistil. Can it directly perform fertilisation within the same flower? Explain.

No. The flower lacks the female reproductive part (pistil), so it cannot provide the female reproductive structure required for fertilisation within that flower.

HOTS 2. If the anther is removed before pollen release, what reproductive event is directly affected?

Pollen production/release and therefore pollination by that flower will be affected.

HOTS 3. If the stigma is damaged, why may fertilisation be affected?

The stigma receives pollen. Damage to it may reduce successful pollen deposition and germination, thereby preventing normal pollen tube formation.

HOTS 4. Why is pollination not the same as fertilisation?

Pollination is pollen transfer from anther to stigma, whereas fertilisation is the fusion of male and female gametes.

HOTS 5. Why is the style important even though it does not itself produce gametes?

It provides the pathway through which the pollen tube grows from the stigma towards the ovary and ovule.

19. CBSE Golden Points

Flower = Reproductive Structure Stamen = Male Pistil = Female Anther = Pollen Stigma = Receives Pollen Ovary = Contains Ovules Ovule → Seed Ovary → Fruit Pollination ≠ Fertilisation Zygote → Embryo

• Stamen is the male reproductive part.
• Pistil/carpel is the female reproductive part.
• Anther produces pollen grains.
• Filament supports the anther.
• Stigma receives pollen grains.
• Style connects stigma with ovary.
• Ovary contains ovules.
• Pollination is transfer of pollen from anther to stigma.
• Fertilisation is fusion of male and female gametes.
• Fertilisation produces a zygote.
• Zygote develops into embryo.
• Ovule generally develops into seed.
• Ovary generally develops into fruit.
• Double fertilisation is characteristic of flowering plants.

20. Easy Memory Trick

STAMEN:
F = Filament
A = Anther

PISTIL:
S = Stigma
S = Style
O = Ovary

Remember:
“Anther gives, Stigma receives.”
“Ovule becomes Seed, Ovary becomes Fruit.”

21. One-Line Revision

Flower → Stamen + Pistil → Pollination → Pollen Tube → Fertilisation → Zygote → Embryo → Seed/Fruit

English Revision:
The flower is the reproductive structure of flowering plants. Stamen is the male part and pistil is the female part. Anther produces pollen. Stigma receives pollen. Pollen tube grows through the style towards an ovule. Fertilisation produces a zygote. The zygote develops into an embryo, the ovule generally becomes a seed and the ovary generally becomes a fruit.

हिन्दी पुनरावृत्ति:
फूल पुष्पीय पौधों की जनन संरचना है। पुंकेसर नर जनन भाग तथा स्त्रीकेसर मादा जनन भाग है। परागकोष परागकण बनाता है। वर्तिकाग्र परागकण ग्रहण करता है। परागनलिका वर्तिका से होकर बीजांड तक पहुँचती है। नर एवं मादा युग्मक के संलयन से युग्मनज बनता है। युग्मनज भ्रूण बनाता है, बीजांड सामान्यतः बीज तथा अंडाशय सामान्यतः फल में विकसित होता है।

22. Diagram Labelling Practice

Label these parts in a flower diagram:

1. Petal
2. Sepal
3. Anther
4. Filament
5. Stigma
6. Style
7. Ovary
8. Ovule

हिन्दी:

1. पंखुड़ी
2. बाह्यदल
3. परागकोष
4. तंतु
5. वर्तिकाग्र
6. वर्तिका
7. अंडाशय
8. बीजांड

23. Complete Concept Summary

🌸 COMPLETE FLOW:

Flower / फूल ↓
Four Whorls / चार मुख्य भाग
↓
Stamen + Pistil
↓
Anther produces Pollen
↓
Pollination
↓
Pollen lands on Stigma
↓
Pollen Tube Formation
↓
Pollen Tube through Style
↓
Ovule
↓
Male Gamete + Female Gamete
↓
Fertilisation
↓
Zygote
↓
Embryo
↓
Ovule → Seed
Ovary → Fruit

Class 10th Science Chapter 7 – How Do Organisms Reproduce? | Sexual Reproduction in Plants

How Do Organisms Reproduce?

Sexual Reproduction in Plants | Class 10 Science | CBSE + Foundation + Competitive

Sexual Reproduction in Plants

1. Introduction | परिचय

English:
Sexual reproduction in flowering plants involves the formation and fusion of male and female gametes. The reproductive structures of a typical flowering plant are present in the flower. A flower may contain:

• Male reproductive part – Stamen
• Female reproductive part – Pistil / Carpel

Sexual reproduction generally creates greater genetic variation because genetic material from two gametes is combined.

हिन्दी:
पुष्पीय पौधों में लैंगिक जनन में नर तथा मादा युग्मकों का निर्माण और उनका संलयन शामिल होता है। पुष्प पौधों की प्रमुख जनन संरचना है।

Flower

→

Gamete Formation

→

Pollination

→

Fertilisation

→

Seed

→

New Plant

2. Structure of a Flower | पुष्प की संरचना

A typical flower consists of four major whorls:

Part	Function
Sepals	Protect the flower in the bud stage.
Petals	Often attract pollinators through colour, scent and other features.
Stamen	Male reproductive part; produces pollen grains.
Pistil / Carpel	Female reproductive part; contains ovary and ovules.

हिन्दी: फूल के चार प्रमुख भाग होते हैं—बाह्यदल, पंखुड़ी, पुंकेसर और स्त्रीकेसर।

3. Animated Flower Diagram | पुष्प का चित्र

🌸 Labelled Flower – Male and Female Reproductive Parts

4. Stamen – Male Reproductive Part | पुंकेसर

The stamen is the male reproductive part of a flower. It has two main parts:

• Filament: Slender stalk that supports the anther.
• Anther: Produces pollen grains.

Pollen grains contain the male reproductive cells/gametes that participate in fertilisation. हिन्दी: पुंकेसर फूल का नर जनन भाग है। इसके दो प्रमुख भाग तंतु (Filament) और परागकोष (Anther) हैं।

Stamen = Filament + Anther

5. Pistil / Carpel – Female Reproductive Part | स्त्रीकेसर

The pistil or carpel is the female reproductive part of a flower. It consists of:

• Stigma: Sticky surface that receives pollen grains.
• Style: Slender part connecting stigma to ovary.
• Ovary: Contains ovules.

The ovule contains the female reproductive structure, including the egg cell. हिन्दी: स्त्रीकेसर फूल का मादा जनन भाग है। इसके प्रमुख भाग वर्तिकाग्र, वर्तिका और अंडाशय हैं।

Pistil = Stigma + Style + Ovary

6. Pollen Grains | परागकण

Pollen grains are produced in the anthers. They carry the male reproductive cells. When pollen reaches a compatible stigma, it can germinate and form a pollen tube. The pollen tube grows through the style towards the ovary and helps deliver the male gamete to the ovule.

7. Pollination | परागण

Pollination is the transfer of pollen grains from the anther to the stigma. There are two major types:

Type	Meaning
Self-pollination	Transfer of pollen to the stigma of the same flower or another flower on the same plant, depending on the context.
Cross-pollination	Transfer of pollen from one plant to the stigma of a flower on another plant of the same species.

8. Agents of Pollination | परागण के माध्यम

Pollen can be transferred by different agents such as:

• Wind
• Water in some aquatic plants
• Insects such as bees and butterflies
• Birds and other animals

Flowers may possess adaptations that help attract or utilise pollinating agents.

9. Pollen Tube Formation | परागनलिका का निर्माण

Animated Pollen Tube Growth

10. Fertilisation | निषेचन

Fertilisation is the fusion of male and female gametes. In flowering plants, the male gamete delivered through the pollen tube fuses with the egg cell inside the ovule. The product of fertilisation is called a zygote.

Male Gamete + Female Gamete → Fertilisation → Zygote

Important: Pollination and fertilisation are not the same process.

Pollination: Transfer of pollen from anther to stigma.
Fertilisation: Fusion of male and female gametes.

11. Changes After Fertilisation | निषेचन के बाद परिवर्तन

Structure	Develops into
Zygote	Embryo
Ovule	Seed
Ovary	Fruit

After fertilisation:

• The zygote develops into an embryo.
• The ovule develops into a seed.
• The ovary develops into a fruit.
• Other floral parts may wither or fall off, though some may persist depending on the plant.

12. Formation of Seed | बीज का निर्माण

A seed contains a young developing plant called the embryo along with protective and nutritive structures. The seed can remain dormant for a period and germinate when suitable conditions are available.

Ovule → Seed → Germination → Seedling → Plant

13. Formation of Fruit | फल का निर्माण

After fertilisation, the ovary generally develops into a fruit. The fruit protects the seeds and can help in their dispersal. Different fruits have different structures and adaptations for seed dispersal.

14. Advanced Concept – Double Fertilisation | द्विनिषेचन

Foundation / Competitive Level: In flowering plants, two fertilisation events occur. One male gamete fuses with the egg cell to form the zygote. The other male gamete fuses with the polar nuclei in the central cell to form the primary endosperm nucleus. This phenomenon is called double fertilisation.

Male Gamete + Egg → Zygote

Male Gamete + Polar Nuclei → Primary Endosperm Nucleus

Competitive Exam Point: Double fertilisation is a characteristic feature of flowering plants (angiosperms).

15. Self-Pollination and Cross-Pollination

Self-Pollination	Cross-Pollination
Pollen reaches a stigma on the same plant.	Pollen moves from one plant to another plant of the same species.
Usually less genetic variation.	Generally promotes greater genetic variation.
Does not require pollen transfer between two separate plants.	Requires transfer between different plants.

16. Sexual vs Asexual Reproduction in Plants

Asexual Reproduction	Sexual Reproduction
Generally one parent.	Male and female gametes participate.
No gamete fusion.	Gamete fusion occurs.
Generally less variation.	Generally greater variation.
Examples: vegetative propagation.	Flowering plant reproduction through pollination and fertilisation.

17. Importance of Sexual Reproduction | लैंगिक जनन का महत्व

Sexual reproduction is important because it:

• Combines genetic material from two gametes.
• Generates genetic variation.
• Provides variation that can contribute to adaptation and evolution.
• Produces seeds in flowering plants.
• Helps maintain continuity of plant species.

18. MCQs – Multiple Choice Questions

Q1. The male reproductive part of a flower is:

A) Stamen

B) Pistil

C) Ovary

D) Stigma

Answer: A) Stamen

The stamen is the male reproductive part of a flower.

Q2. The female reproductive part of a flower is:

A) Anther

B) Filament

C) Pistil

D) Pollen grain

Answer: C) Pistil

Q3. Pollen grains are produced in the:

A) Ovary

B) Anther

C) Stigma

D) Style

Answer: B) Anther

Q4. The stalk supporting the anther is called:

A) Style

B) Filament

C) Stigma

D) Ovule

Answer: B) Filament

Q5. The sticky part that receives pollen is:

A) Ovary

B) Anther

C) Stigma

D) Filament

Answer: C) Stigma

Q6. The ovules are present inside the:

A) Ovary

B) Anther

C) Filament

D) Stigma

Answer: A) Ovary

Q7. Transfer of pollen from anther to stigma is called:

A) Fertilisation

B) Germination

C) Pollination

D) Fragmentation

Answer: C) Pollination

Q8. Fusion of male and female gametes is called:

A) Pollination

B) Fertilisation

C) Germination

D) Dispersal

Answer: B) Fertilisation

Q9. The product of fertilisation is:

A) Pollen grain

B) Ovule

C) Zygote

D) Fruit

Answer: C) Zygote

Q10. After fertilisation, the ovule generally develops into:

A) Fruit

B) Seed

C) Flower

D) Stigma

Answer: B) Seed

Q11. After fertilisation, the ovary generally develops into:

A) Fruit

B) Seed

C) Pollen

D) Anther

Answer: A) Fruit

Q12. The zygote develops into:

A) Embryo

B) Pollen

C) Stigma

D) Anther

Answer: A) Embryo

Q13. The pollen tube grows through the:

A) Style

B) Anther

C) Filament

D) Sepal

Answer: A) Style

Q14. Which is an agent of pollination?

A) Insects

B) Kidney

C) Neuron

D) Nephron

Answer: A) Insects

Q15. Cross-pollination involves transfer of pollen:

A) Between different plants of the same species

B) From root to leaf

C) From ovary to anther

D) From seed to fruit

Answer: A) Between different plants of the same species

Q16. Which structure contains ovules?

A) Ovary

B) Anther

C) Filament

D) Petal

Answer: A) Ovary

Q17. Which structure produces pollen grains?

A) Stigma

B) Anther

C) Ovary

D) Style

Answer: B) Anther

Q18. Which structure receives pollen grains?

A) Stigma

B) Ovule

C) Anther

D) Filament

Answer: A) Stigma

Q19. Which sequence is correct?

A) Anther → Pollen → Stigma → Pollen Tube → Ovule

B) Ovary → Anther → Seed → Stigma

C) Seed → Pollen → Root → Ovary

D) Stigma → Seed → Anther → Fruit

Answer: A) Anther → Pollen → Stigma → Pollen Tube → Ovule

Q20. Which process directly produces the zygote?

A) Pollination

B) Fertilisation

C) Germination

D) Dispersal

Answer: B) Fertilisation

Q21. Which part connects stigma with ovary?

A) Style

B) Filament

C) Anther

D) Petal

Answer: A) Style

Q22. Which of the following generally produces greater variation?

A) Sexual reproduction

B) Vegetative propagation

C) Cutting

D) Budding

Answer: A) Sexual reproduction

Q23. Double fertilisation is characteristic of:

A) Flowering plants

B) Fungi

C) Bacteria

D) Amoeba

Answer: A) Flowering plants

Q24. In double fertilisation, one male gamete fuses with:

A) Egg cell

B) Pollen grain

C) Stigma

D) Anther

Answer: A) Egg cell

Q25. The second male gamete in double fertilisation fuses with:

A) Polar nuclei

B) Stigma

C) Petal

D) Sepal

Answer: A) Polar nuclei

Q26. Which floral part usually attracts pollinators?

A) Petals

B) Ovule

C) Style

D) Filament

Answer: A) Petals

Q27. Self-pollination generally occurs:

A) On the same plant

B) Only between different species

C) Only through water

D) Only through birds

Answer: A) On the same plant

Q28. The embryo develops from:

A) Zygote

B) Pollen grain

C) Anther

D) Stigma

Answer: A) Zygote

Q29. Which pair is correctly matched?

A) Anther – Pollen

B) Ovary – Pollen grains

C) Stigma – Ovules

D) Filament – Egg cell

Answer: A) Anther – Pollen

Q30. Which sequence correctly represents sexual reproduction in a flowering plant?

A) Pollination → Pollen tube → Fertilisation → Zygote → Seed

B) Seed → Pollination → Anther → Root

C) Fruit → Pollen → Leaf → Fertilisation

D) Root → Flower → Fragmentation → Seed

Answer: A) Pollination → Pollen tube → Fertilisation → Zygote → Seed

19. Subjective Questions with Answers

2 Marks Q1. What is sexual reproduction in plants?

Sexual reproduction in plants involves the formation and fusion of male and female gametes. In flowering plants, reproduction occurs through flowers.

2 Marks Q2. Name the male and female reproductive parts of a flower.

Male reproductive part – Stamen.
Female reproductive part – Pistil or Carpel.

2 Marks Q3. What is pollination?

Pollination is the transfer of pollen grains from the anther to the stigma of a flower.

2 Marks Q4. What is fertilisation?

Fertilisation is the fusion of male and female gametes to form a zygote.

2 Marks Q5. What happens to the ovule and ovary after fertilisation?

The ovule generally develops into a seed and the ovary generally develops into a fruit.

3 Marks Q6. Describe the structure of a stamen.

A stamen consists of two main parts: filament and anther. The filament supports the anther, while the anther produces pollen grains.

3 Marks Q7. Describe the structure of a pistil.

The pistil consists of stigma, style and ovary. The stigma receives pollen, the style connects stigma to ovary, and the ovary contains ovules.

3 Marks Q8. Differentiate between pollination and fertilisation.

Pollination: Transfer of pollen from anther to stigma.

Fertilisation: Fusion of male and female gametes to form a zygote.

3 Marks Q9. What is the function of the pollen tube?

The pollen tube grows from the germinating pollen grain through the style towards the ovule and provides a pathway for the male gamete to reach the female gamete.

3 Marks Q10. Name three agents of pollination.

Wind, insects and birds are examples of agents of pollination. Water also acts as an agent in some aquatic plants.

4 Marks Q11. Explain self-pollination and cross-pollination.

Self-pollination involves transfer of pollen to the stigma on the same plant. Cross-pollination involves transfer of pollen from one plant to another plant of the same species. Cross-pollination generally promotes greater genetic variation.

4 Marks Q12. Explain the role of anther, stigma and ovary.

• Anther: Produces pollen grains.
• Stigma: Receives pollen grains.
• Ovary: Contains ovules where the female reproductive structure is present.

4 Marks Q13. What changes occur in a flower after fertilisation?

The zygote develops into an embryo, ovules develop into seeds and the ovary generally develops into a fruit. Other floral parts may wither or fall off depending on the plant.

4 Marks Q14. Why is sexual reproduction important for variation?

Sexual reproduction combines genetic material from male and female gametes. This mixing of genetic information generally produces greater variation among offspring.

4 Marks Q15. Explain the role of pollinating agents.

Pollinating agents transfer pollen grains from anthers to stigmas. Wind, insects, birds and in some plants water can act as pollinating agents.

5 Marks Q16. Explain sexual reproduction in flowering plants.

The flower contains male and female reproductive parts. The anther produces pollen grains. Pollination transfers pollen to the stigma. The pollen grain germinates and forms a pollen tube that grows towards the ovule. The male gamete reaches the egg and fuses with it to form a zygote. The zygote develops into an embryo, the ovule becomes a seed and the ovary generally becomes a fruit.

5 Marks Q17. Explain the structure and functions of the male reproductive part of a flower.

The male reproductive part is the stamen. It consists of filament and anther. The filament is a slender stalk that supports the anther. The anther produces pollen grains, which carry the male reproductive cells.

5 Marks Q18. Explain the structure and functions of the female reproductive part of a flower.

The female reproductive part is the pistil or carpel. It consists of stigma, style and ovary. The stigma receives pollen, the style provides a path for the pollen tube and the ovary contains ovules.

5 Marks Q19. Describe the events between pollination and fertilisation.

After pollen reaches a compatible stigma, it germinates and forms a pollen tube. The pollen tube grows through the style towards the ovary and reaches an ovule. The male gamete is delivered to the female gamete, and fusion produces a zygote.

5 Marks Q20. Differentiate between sexual and asexual reproduction.

Sexual Reproduction	Asexual Reproduction
Involves male and female gametes.	Usually does not involve gamete fusion.
Fertilisation occurs.	Fertilisation does not occur.
Generally produces greater variation.	Generally produces less variation.

6 Marks Q21. Describe the complete process of sexual reproduction in flowering plants.

1. The flower contains reproductive structures.
2. The anther produces pollen grains.
3. Pollination transfers pollen to the stigma.
4. The pollen grain germinates and forms a pollen tube.
5. The pollen tube grows through the style towards the ovule.
6. The male gamete reaches the egg cell.
7. Fusion of gametes forms a zygote.
8. The zygote develops into an embryo.
9. The ovule develops into a seed.
10. The ovary generally develops into a fruit.

6 Marks Q22. Explain pollination and its types.

Pollination is the transfer of pollen grains from anther to stigma.

Self-pollination: Pollen is transferred to a stigma on the same plant.

Cross-pollination: Pollen is transferred from one plant to another plant of the same species.

Cross-pollination generally creates greater genetic variation.

6 Marks Q23. Explain the changes that occur after fertilisation.

• Male and female gametes fuse to form a zygote.
• The zygote develops into an embryo.
• The ovule develops into a seed.
• The ovary generally develops into a fruit.
• The seed contains the developing embryo.
• The seed can later germinate into a new plant under suitable conditions.

6 Marks Q24. Explain the importance of sexual reproduction in plants.

Sexual reproduction combines genetic material from two gametes and generally creates greater genetic variation. Variation can help populations adapt to changing environments and provides raw material for natural selection and evolution. In flowering plants, sexual reproduction also results in formation of seeds and fruits.

6 Marks Q25. Explain the role of the flower in sexual reproduction.

The flower contains the reproductive structures of flowering plants. The stamen produces pollen grains, while the pistil contains the ovary and ovules. Pollination transfers pollen to the stigma. The pollen tube carries the male gamete towards the ovule, where fertilisation occurs. After fertilisation, seeds and fruits develop.

6 Marks Q26. Explain double fertilisation in flowering plants.

In flowering plants, two male gametes participate in two fusion events. One male gamete fuses with the egg cell to form the zygote. The other male gamete fuses with the polar nuclei in the central cell to form the primary endosperm nucleus. This is called double fertilisation.

6 Marks Q27. Explain how a seed is formed from an ovule.

After fertilisation, the zygote develops into an embryo within the ovule. The ovule undergoes changes and develops into a seed. The seed contains the embryo and protective/nutritive structures. Under suitable conditions, it can germinate and produce a seedling.

6 Marks Q28. Explain why cross-pollination can increase variation.

Cross-pollination transfers pollen between different plants of the same species. Therefore, genetic material from different parent plants can be combined during sexual reproduction. This generally increases genetic variation among offspring compared with reproduction that involves only one parent.

6 Marks Q29. Explain the difference between pollination, fertilisation and seed formation.

Pollination: Transfer of pollen from anther to stigma.

Fertilisation: Fusion of male and female gametes to form a zygote.

Seed formation: After fertilisation, the ovule develops into a seed containing the developing embryo.

6 Marks Q30. Write the complete sequence of sexual reproduction in a flowering plant.

Anther

→

Pollen

→

Stigma

→

Pollen Tube

→

Ovule

→

Fertilisation

→

Zygote

→

Embryo

→

Seed

20. HOTS / Competency Based Questions

HOTS 1. A flower has a healthy ovary and ovules, but pollen grains never reach its stigma. Will fertilisation normally occur? Explain.

Normally, no. Pollination is required to bring pollen to the stigma so that a pollen tube can form and deliver the male gamete to the ovule.

HOTS 2. Why is the stigma often sticky?

Its sticky surface helps receive and retain pollen grains, increasing the chance that compatible pollen will germinate.

HOTS 3. A student says, “Pollination and fertilisation are the same thing.” Is the statement correct?

No. Pollination is pollen transfer from anther to stigma, whereas fertilisation is fusion of male and female gametes.

HOTS 4. If the anther of a flower is removed before pollen release, what reproductive process will be directly affected?

Pollen production/release and therefore pollination will be affected because the anther produces pollen grains.

HOTS 5. Why can sexual reproduction be important for the long-term survival of a plant population?

It generally produces genetic variation. Some variations may help plants survive changing environmental conditions and can contribute to adaptation and evolution.

21. Important Diagram Labelling

Flower Diagram:

• Petal
• Sepal
• Filament
• Anther
• Stigma
• Style
• Ovary
• Ovule
• Stamen
• Pistil / Carpel

Pollen Tube Diagram:

• Stigma
• Style
• Ovary
• Ovule
• Pollen tube
• Male gamete

22. CBSE Golden Points | परीक्षा के लिए महत्वपूर्ण बिंदु

• Flower → reproductive structure of flowering plants.
• Stamen → male reproductive part.
• Pistil/Carpel → female reproductive part.
• Stamen = Filament + Anther.
• Pistil = Stigma + Style + Ovary.
• Anther → produces pollen grains.
• Stigma → receives pollen.
• Ovary → contains ovules.
• Pollination → transfer of pollen from anther to stigma.
• Fertilisation → fusion of male and female gametes.
• Zygote → develops into embryo.
• Ovule → seed.
• Ovary → fruit.
• Self-pollination → same plant.
• Cross-pollination → different plants of same species.
• Sexual reproduction generally produces greater variation.
• Double fertilisation → characteristic of flowering plants.

🧠 Easy Memory Trick

STAMEN → FA
Filament + Anther

PISTIL → SSO
Stigma + Style + Ovary

A → P → S → T → O
Anther → Pollen → Stigma → Tube → Ovule

O → S = Ovule → Seed
O → F = Ovary → Fruit

23. One-Line Revision | एक पंक्ति में पुनरावृत्ति

Stamen: Filament + Anther → Pollen

Pistil: Stigma + Style + Ovary → Ovules

Pollination: Anther → Stigma

Pollen Tube: Stigma → Style → Ovary → Ovule

Fertilisation: Male Gamete + Egg → Zygote

Post-Fertilisation: Zygote → Embryo; Ovule → Seed; Ovary → Fruit

24. Complete Concept Flow

Flower

→

Stamen + Pistil

→

Pollen Formation

→

Pollination

→

Pollen Tube

→

Fertilisation

→

Zygote

→

Embryo

→

Seed

→

New Plant

⭐ Final Exam Revision:

🌸 Flower = reproductive structure
♂️ Stamen = male part
♀️ Pistil = female part
🌾 Anther = pollen
🎯 Stigma = receives pollen
🌱 Ovary = contains ovules
➡️ Pollination = pollen transfer
❤️ Fertilisation = gamete fusion
🧬 Zygote = first cell after fertilisation
🌰 Ovule → Seed
🍎 Ovary → Fruit

Class 10th Science Chapter 7 – How Do Organisms Reproduce? | Spore Formation and Vegetative Propagation

How Do Organisms Reproduce?

Spore Formation and Vegetative Propagation | Class 10 Science | CBSE + Foundation + Competitive

Spore Formation and Vegetative Propagation

1. Introduction | परिचय

English:
Spore formation and vegetative propagation are important methods of asexual reproduction. In asexual reproduction, generally one parent is involved and there is no fusion of male and female gametes. Two important methods covered in this topic are:

• Spore Formation
• Vegetative Propagation

हिन्दी:
बीजाणु निर्माण तथा कायिक प्रवर्धन अलैंगिक जनन की महत्वपूर्ण विधियाँ हैं। अलैंगिक जनन में सामान्यतः एक जनक भाग लेता है और नर तथा मादा युग्मकों का संलयन नहीं होता।

Asexual Reproduction

→

Spore Formation

OR

Vegetative Propagation

→

New Plant / Organism

2. Spore Formation | बीजाणु निर्माण

English:
Spore formation is a method of asexual reproduction in which an organism produces specialised reproductive structures called spores. Spores are usually produced inside or associated with specialised structures called sporangia in organisms such as Rhizopus. When mature spores are released, they can be dispersed by air. Under suitable conditions, a spore germinates and develops into a new organism. हिन्दी:
बीजाणु निर्माण में जीव विशेष जनन संरचनाएँ बनाता है जिन्हें बीजाणु (Spores) कहते हैं। राइजोपस जैसे जीवों में बीजाणु सामान्यतः बीजाणुधानी (Sporangium) नामक संरचना के अंदर बनते हैं। परिपक्व बीजाणु बाहर निकलकर वायु द्वारा फैल सकते हैं और अनुकूल परिस्थितियों में अंकुरित होकर नया जीव बनाते हैं।

Sporangium → Spores → Release → Dispersal → Germination → New Organism

3. Spore Formation in Rhizopus | राइजोपस में बीजाणु निर्माण

Rhizopus is a fungus commonly called bread mould. It commonly reproduces asexually by spore formation. The black spherical structure at the tip of a sporangiophore is the sporangium. The sporangium contains numerous spores. When the sporangium matures, it may rupture and release spores. The spores are dispersed by air and germinate under favourable conditions.

Animated Diagram – Spore Formation in Rhizopus

Important CBSE Point:
Rhizopus reproduces by spores formed inside the sporangium. The spores are light and can be dispersed easily by air.

4. Important Features of Spores | बीजाणुओं की विशेषताएँ

Spores are useful for asexual reproduction because they can:

• Be produced in large numbers.
• Be dispersed easily.
• Remain protected by a resistant covering in many fungi.
• Germinate when suitable environmental conditions are available.

हिन्दी: बीजाणु बड़ी संख्या में बन सकते हैं और आसानी से एक स्थान से दूसरे स्थान तक पहुँच सकते हैं।

5. Germination of Spores | बीजाणुओं का अंकुरण

English:
When a spore reaches a suitable environment containing appropriate moisture, temperature and nutrients, it can germinate. During germination, the spore develops into a new organism. हिन्दी:
जब बीजाणु को उपयुक्त नमी, तापमान तथा पोषक परिस्थितियाँ मिलती हैं, तो वह अंकुरित होकर नया जीव विकसित कर सकता है।

Mature Spore

→

Suitable Conditions

→

Germination

→

New Organism

6. Vegetative Propagation | कायिक प्रवर्धन

English:
Vegetative propagation is a type of asexual reproduction in plants in which new plants develop from vegetative parts of the parent plant such as:

• Root
• Stem
• Leaf

No seed formation is necessary for producing the new plant through vegetative propagation. हिन्दी:
कायिक प्रवर्धन पौधों में अलैंगिक जनन की वह विधि है जिसमें नए पौधे जनक पौधे के कायिक भागों जैसे जड़, तना या पत्ती से विकसित होते हैं। इसमें नया पौधा बनाने के लिए बीज बनना आवश्यक नहीं होता।

Root + Stem + Leaf → New Plant

7. Natural Vegetative Propagation | प्राकृतिक कायिक प्रवर्धन

Natural vegetative propagation occurs naturally without deliberate human intervention. Important examples include:

Vegetative Part	Example	Explanation
Stem	Potato	Eyes of potato can produce new shoots.
Stem	Ginger	Rhizome can produce new shoots.
Stem	Turmeric	Rhizome can produce new plants.
Leaf	Bryophyllum	Leaf margins can produce buds that develop into plantlets.
Stem	Strawberry	Runners can form new plants.

8. Potato – Vegetative Propagation by Stem

Potato is a modified underground stem called a tuber. The small structures called eyes on the potato can develop into shoots. Each suitable eye can give rise to a new potato plant. Therefore, potato is an example of vegetative propagation through a modified stem.

Animated Diagram – Potato Eyes

Exam Point: Potato is a stem, not a root, because its eyes are buds capable of producing new shoots.

9. Bryophyllum – Vegetative Propagation by Leaf

Bryophyllum can reproduce vegetatively through its leaves. Small buds develop along the margins of the leaf. These buds can grow into small plantlets. The plantlets may detach from the leaf, fall onto the soil and develop into independent plants.

Animated Diagram – Bryophyllum Leaf

10. Ginger – Vegetative Propagation by Rhizome

Ginger has a modified underground stem called a rhizome. The rhizome contains buds. When suitable conditions are available, these buds develop into new shoots. Therefore, ginger is an example of vegetative propagation through a modified stem.

11. Artificial Vegetative Propagation | कृत्रिम कायिक प्रवर्धन

Humans can deliberately use vegetative parts of plants to produce new plants. Important artificial methods include:

• Cutting
• Layering
• Grafting

These methods are widely useful in agriculture and horticulture.

12. Cutting | कलम द्वारा प्रवर्धन

In cutting, a portion of a stem containing suitable buds is cut from the parent plant and placed in suitable conditions. Roots develop from the cutting and a new plant is formed. Examples: Rose, Sugarcane, Money plant.

Stem Cutting → Roots + Shoots → New Plant

13. Layering | लेयरिंग

In layering, a branch is bent down and a portion of it is covered with moist soil while it remains attached to the parent plant. Roots develop from the covered portion. After sufficient root development, the branch can be separated and grown as an independent plant.

14. Grafting | ग्राफ्टिंग

Grafting is a technique in which a part of one plant is joined to another compatible plant. The rooted plant providing the root system is called the stock. The part attached to the stock is called the scion. After successful union, the scion grows using the root system of the stock.

Stock + Scion → Successful Graft → New Growth

15. Advantages of Vegetative Propagation

Important advantages are:

• New plants can be produced quickly.
• Only one parent plant is needed.
• Plants can be produced without seeds.
• Useful characteristics of a parent plant can be retained.
• Useful for plants that produce few or no viable seeds.
• Many plants can be propagated from selected parent plants.

16. Limitations of Vegetative Propagation

• It generally produces less genetic variation than sexual reproduction.
• Diseases present in the parent plant may be passed to new plants.
• Low genetic diversity can make populations less adaptable to major environmental changes.

17. Vegetative Propagation vs Sexual Reproduction

Vegetative Propagation	Sexual Reproduction
Generally one parent.	Usually involves two types of gametes.
No fusion of gametes.	Fusion of gametes occurs during fertilisation.
New plant develops from vegetative parts.	New plant generally develops from a seed formed after sexual reproduction.
Usually produces less variation.	Generally produces greater variation.

18. Natural vs Artificial Vegetative Propagation

Natural	Artificial
Occurs naturally.	Performed deliberately by humans.
Potato, ginger, Bryophyllum.	Cutting, layering, grafting.
No special human technique required.	Human intervention is required.

19. Spore Formation vs Vegetative Propagation

Spore Formation	Vegetative Propagation
Produces spores.	Uses vegetative plant parts.
Common in fungi such as Rhizopus.	Common in plants.
Spores can disperse through air.	New plants develop from root, stem or leaf.
Sporangium may contain numerous spores.	Examples include potato and Bryophyllum.

20. MCQs – Multiple Choice Questions

Q1. Which organism commonly reproduces by spore formation?

A) Rhizopus

B) Amoeba

C) Hydra

D) Planaria

Answer: A) Rhizopus

Rhizopus, a bread mould, commonly reproduces asexually by forming spores inside a sporangium.

Q2. Spores of Rhizopus are produced inside:

A) Anther

B) Sporangium

C) Ovary

D) Bud

Answer: B) Sporangium

Q3. The black spherical structure in Rhizopus is:

A) Root

B) Leaf

C) Sporangium

D) Rhizome

Answer: C) Sporangium

Q4. Spores are commonly dispersed by:

A) Air

B) Blood

C) Roots

D) Seeds

Answer: A) Air

Q5. Vegetative propagation occurs through:

A) Only flowers

B) Root, stem or leaf

C) Only pollen

D) Only seeds

Answer: B) Root, stem or leaf

Q6. Potato reproduces vegetatively through its:

A) Roots

B) Flowers

C) Eyes

D) Fruits

Answer: C) Eyes

Q7. Potato is considered a modified:

A) Root

B) Stem

C) Leaf

D) Flower

Answer: B) Stem

Q8. Vegetative propagation through leaves is demonstrated by:

A) Bryophyllum

B) Amoeba

C) Rhizopus

D) Plasmodium

Answer: A) Bryophyllum

Q9. In Bryophyllum, plantlets develop from:

A) Leaf margins

B) Roots only

C) Flowers

D) Fruits

Answer: A) Leaf margins

Q10. Ginger reproduces vegetatively through:

A) Rhizome

B) Flower

C) Seed only

D) Leaf blade

Answer: A) Rhizome

Q11. A rhizome is a modified:

A) Stem

B) Leaf

C) Flower

D) Root hair

Answer: A) Stem

Q12. Which is an artificial method of vegetative propagation?

A) Cutting

B) Binary fission

C) Budding

D) Spore formation

Answer: A) Cutting

Q13. Which is NOT an artificial vegetative propagation method?

A) Layering

B) Grafting

C) Cutting

D) Multiple fission

Answer: D) Multiple fission

Q14. In grafting, the rooted plant is called:

A) Scion

B) Stock

C) Spore

D) Bud

Answer: B) Stock

Q15. In grafting, the part attached to the stock is:

A) Scion

B) Root hair

C) Spore

D) Rhizome

Answer: A) Scion

Q16. Which of the following is an advantage of vegetative propagation?

A) Rapid production of plants

B) Always produces maximum variation

C) Requires fertilisation

D) Requires two parents

Answer: A) Rapid production of plants

Q17. Vegetative propagation generally produces:

A) Less variation

B) Maximum variation always

C) Only gametes

D) No offspring

Answer: A) Less variation

Q18. Which structure of potato is a bud?

A) Eye

B) Peel

C) Pulp

D) Root

Answer: A) Eye

Q19. Which plant is associated with leaf propagation?

A) Bryophyllum

B) Ginger

C) Potato

D) Sugarcane

Answer: A) Bryophyllum

Q20. A new plant produced from a stem cutting is an example of:

A) Artificial vegetative propagation

B) Sexual reproduction

C) Fertilisation

D) Pollination

Answer: A) Artificial vegetative propagation

Q21. Which condition is generally important for spore germination?

A) Suitable environmental conditions

B) Absence of all moisture

C) No nutrients

D) Complete darkness in every case

Answer: A) Suitable environmental conditions

Q22. Which part of Rhizopus bears the sporangium?

A) Sporangiophore

B) Root

C) Leaf

D) Flower

Answer: A) Sporangiophore

Q23. Which plant is commonly propagated through stem cuttings?

A) Rose

B) Mango seed only

C) Wheat grain

D) Rice seed

Answer: A) Rose

Q24. Which method involves bending a branch and covering part of it with soil?

A) Layering

B) Grafting

C) Spore formation

D) Fission

Answer: A) Layering

Q25. Which method joins a scion to a stock?

A) Grafting

B) Cutting

C) Layering

D) Fragmentation

Answer: A) Grafting

Q26. Which statement is correct about vegetative propagation?

A) It can produce plants without seeds.

B) It always requires fertilisation.

C) It always requires two parents.

D) It occurs only in fungi.

Answer: A) It can produce plants without seeds.

Q27. Which is a disadvantage of vegetative propagation?

A) Disease can pass from parent to offspring.

B) It always produces seeds.

C) It requires gamete fusion.

D) It cannot produce plants quickly.

Answer: A) Disease can pass from parent to offspring.

Q28. Spores are useful because they:

A) Can be produced in large numbers

B) Always require fertilisation

C) Are always seeds

D) Cannot disperse

Answer: A) Can be produced in large numbers

Q29. Which pair is correctly matched?

A) Potato – Eye

B) Bryophyllum – Rhizome

C) Rhizopus – Grafting

D) Ginger – Leaf margin buds

Answer: A) Potato – Eye

Q30. Which sequence represents spore formation?

A) Sporangium → Spores → Dispersal → Germination

B) Flower → Pollen → Grafting

C) Root → Gamete → Fertilisation

D) Scion → Spore → Seed

Answer: A) Sporangium → Spores → Dispersal → Germination

21. Subjective Questions with Answers

2 Marks Q1. What is spore formation?

Spore formation is asexual reproduction in which specialised reproductive structures called spores are produced. Rhizopus reproduces by this method.

2 Marks Q2. What is a sporangium?

A sporangium is a specialised structure in which spores are formed. In Rhizopus, spores are produced inside the sporangium.

2 Marks Q3. What is vegetative propagation?

Vegetative propagation is asexual reproduction in plants in which new plants develop from vegetative parts such as roots, stems or leaves.

2 Marks Q4. Give two examples of natural vegetative propagation.

Potato through eyes and Bryophyllum through leaf-margin buds.

2 Marks Q5. Why is potato considered a stem?

Potato is a modified underground stem because it has eyes, which are buds capable of producing new shoots.

3 Marks Q6. Explain spore formation in Rhizopus.

Rhizopus forms a sporangium at the tip of a sporangiophore. Numerous spores develop inside the sporangium. On maturity, the sporangium ruptures and releases spores, which are dispersed and may germinate under suitable conditions.

3 Marks Q7. How does Bryophyllum reproduce vegetatively?

Small buds develop on the margins of Bryophyllum leaves. These buds develop into plantlets, which may detach and grow into independent plants.

3 Marks Q8. Explain vegetative propagation in potato.

Potato is a modified underground stem or tuber. It has eyes that represent buds. Under suitable conditions, the eyes sprout and form new shoots, producing new potato plants.

3 Marks Q9. What is artificial vegetative propagation?

It is deliberate propagation of plants by humans using vegetative parts. Cutting, layering and grafting are common methods.

3 Marks Q10. Why are spores useful to fungi?

Spores can be produced in large numbers and dispersed easily. They can germinate when suitable environmental conditions become available.

4 Marks Q11. Describe the structure and function of a Rhizopus sporangium.

The sporangium is a spherical structure present at the tip of a sporangiophore. It contains numerous spores. When mature, it releases the spores, which can disperse through air and germinate under favourable conditions.

4 Marks Q12. Explain natural vegetative propagation with examples.

Natural vegetative propagation occurs without deliberate human intervention. Potato propagates through eyes on its tuber, ginger through its rhizome and Bryophyllum through buds on leaf margins.

4 Marks Q13. Differentiate between natural and artificial vegetative propagation.

Natural	Artificial
Occurs naturally.	Performed deliberately by humans.
Potato, ginger, Bryophyllum.	Cutting, layering, grafting.

4 Marks Q14. Write four advantages of vegetative propagation.

• Rapid production of plants.
• Only one parent is required.
• Plants can be produced without seeds.
• Useful characteristics of the parent can be retained.

4 Marks Q15. Write two advantages and two limitations of vegetative propagation.

Advantages:

• Rapid multiplication.
• Useful characteristics can be retained.

Limitations:

• Less variation is generally produced.
• Diseases may pass from parent to new plants.

5 Marks Q16. Explain spore formation in Rhizopus with a labelled diagram.

Rhizopus develops a sporangiophore bearing a sporangium at its tip. Numerous spores form inside the sporangium. At maturity, the sporangium ruptures and spores are released. They are dispersed by air and germinate under suitable conditions to form new organisms.

5 Marks Q17. Explain vegetative propagation through potato and Bryophyllum.

Potato: The potato is a modified underground stem. Its eyes are buds that produce new shoots.

Bryophyllum: Small buds develop along the leaf margins. These develop into plantlets that can grow into independent plants.

5 Marks Q18. Explain artificial vegetative propagation.

Artificial vegetative propagation is carried out by humans. In cutting, a stem piece produces a new plant. In layering, a branch produces roots while attached to the parent. In grafting, a scion is joined to a suitable stock.

5 Marks Q19. Explain why vegetative propagation is useful in agriculture and horticulture.

It allows rapid multiplication of plants and helps retain desirable characteristics of selected parent plants. It is also useful for plants that produce few or no viable seeds.

5 Marks Q20. Explain the role of spores in the reproduction and dispersal of fungi.

Fungi such as Rhizopus produce numerous spores in sporangia. The spores are released and dispersed, often by air. When they reach favourable conditions, they germinate and develop into new fungal growth.

6 Marks Q21. Describe the complete process of spore formation in Rhizopus.

1. Rhizopus develops a sporangiophore.
2. A sporangium forms at its tip.
3. Numerous spores develop inside the sporangium.
4. The sporangium matures.
5. It ruptures and releases spores.
6. Spores are dispersed by air.
7. Under favourable conditions, spores germinate and form new fungal growth.

6 Marks Q22. Explain natural vegetative propagation with suitable examples.

Stem: Potato – eyes; Ginger – rhizome; Strawberry – runners.

Leaf: Bryophyllum – buds along leaf margins.

These vegetative structures develop into new plants without the formation and germination of seeds.

6 Marks Q23. Describe cutting, layering and grafting.

Cutting: A suitable stem portion is separated from the parent and develops roots and shoots.

Layering: A branch is bent and a portion is covered with soil while attached to the parent. Roots develop before separation.

Grafting: A scion from one plant is joined to a compatible stock with an established root system.

6 Marks Q24. Compare spore formation and vegetative propagation.

Spore Formation	Vegetative Propagation
Spores are produced.	Vegetative plant parts are used.
Common in fungi.	Common in plants.
Example: Rhizopus.	Examples: Potato, ginger, Bryophyllum.

6 Marks Q25. Explain the advantages and limitations of vegetative propagation.

Advantages:

• Rapid multiplication.
• One parent is sufficient.
• Plants can be produced without seeds.
• Desirable parental characteristics can be maintained.

Limitations:

• Generally produces less variation.
• Parent-borne diseases may be transmitted.
• Less variation may reduce adaptability to major environmental changes.

6 Marks Q26. Why is potato a stem and not a root?

Potato is a modified underground stem because it possesses eyes. The eyes are buds capable of producing new shoots. Roots do not normally have such buds arranged as eyes. Therefore, potato is classified as a stem tuber.

6 Marks Q27. Explain why vegetative propagation can be advantageous for maintaining desirable characters.

Vegetative propagation generally produces offspring genetically very similar to the parent, except for changes that may arise through DNA-copying or other biological processes. Therefore, desirable characteristics of a selected parent can be maintained more reliably than through sexual reproduction, which generally creates greater variation.

6 Marks Q28. A farmer wants to rapidly produce many plants with the same desirable characteristics. Which method may be useful and why?

Vegetative propagation can be useful because it allows rapid multiplication from selected parent plants and generally retains the parent's desirable characteristics. Methods such as cutting, layering or grafting may be selected depending on the plant.

6 Marks Q29. Explain how spore formation differs from seed formation.

Spore formation is generally an asexual method in which spores are produced without fusion of male and female gametes. Seed formation in flowering plants generally follows sexual reproduction involving gametes and fertilisation. Seeds contain an embryo and protective structures, whereas spores are usually single reproductive units capable of germination under suitable conditions.

6 Marks Q30. Explain the complete concept of spore formation and vegetative propagation.

Asexual Reproduction

→

Spore Formation

OR

Vegetative Propagation

→

Growth

→

New Organism / Plant

Spore formation is especially important in fungi such as Rhizopus, while vegetative propagation is an important method of asexual reproduction in plants.

22. HOTS / Competency Based Questions

HOTS 1. A student observes a black spherical structure at the tip of a fungal filament containing many tiny structures. Identify the structure and method of reproduction.

Answer: The structure is a sporangium and the method is spore formation.

HOTS 2. A potato is cut into pieces. Only pieces containing eyes are planted. Why?

The eyes are buds capable of producing new shoots. Therefore, they can develop into new potato plants.

HOTS 3. A leaf of Bryophyllum falls on moist soil and small plants appear around its margins. Which process is responsible?

Vegetative propagation through leaf-margin buds.

HOTS 4. Why might vegetative propagation be preferred when a farmer wants plants with characteristics similar to a selected parent?

Because vegetative propagation generally produces offspring genetically very similar to the parent and therefore helps retain desirable characteristics.

HOTS 5. A fungal spore lands on a dry surface but does not germinate immediately. Explain.

Spore germination requires suitable environmental conditions such as adequate moisture, temperature and nutrients. If these conditions are not suitable, germination may not occur.

23. Important Diagram Labelling

Diagram 1 – Rhizopus

• Sporangium
• Spores
• Sporangiophore
• Hypha / Mycelium

Diagram 2 – Potato

• Potato tuber
• Eye
• Bud

Diagram 3 – Bryophyllum

• Leaf
• Leaf margin
• Bud
• Plantlet

Diagram 4 – Artificial Propagation

• Stock
• Scion
• Graft union

24. CBSE Golden Points | परीक्षा के लिए महत्वपूर्ण बिंदु

• Rhizopus → Spore formation.
• Spore-producing structure → Sporangium.
• Sporangium contains numerous spores.
• Spores can be dispersed by air.
• Suitable conditions are needed for spore germination.
• Vegetative propagation → New plant from root, stem or leaf.
• Potato → Stem tuber.
• Potato eyes → Buds.
• Ginger → Rhizome.
• Bryophyllum → Leaf-margin buds.
• Cutting, layering and grafting → Artificial propagation.
• Grafting involves stock and scion.
• Vegetative propagation generally produces less variation than sexual reproduction.
• Vegetative propagation is useful for retaining desirable characteristics.
• Parent-borne diseases can sometimes be transmitted through vegetative propagation.

🧠 Memory Trick

R → Rhizopus → Spores
P → Potato → Eyes
G → Ginger → Rhizome
B → Bryophyllum → Leaf Buds
C → Cutting
L → Layering
G → Grafting

25. One-Line Revision | एक पंक्ति में पुनरावृत्ति

Spore Formation: Sporangium → Spores → Dispersal → Germination → New Organism

Vegetative Propagation: Root / Stem / Leaf → New Plant

Potato: Eye → Bud → New Plant
Bryophyllum: Leaf Margin Bud → Plantlet → New Plant
Ginger: Rhizome → Bud → New Shoot
Artificial: Cutting / Layering / Grafting

26. Complete Concept Flow

Asexual Reproduction

→

Spore Formation

+

Vegetative Propagation

Rhizopus

→

Sporangium

→

Spores

→

Germination

Potato

→

Eyes

→

New Plant

Bryophyllum

→

Leaf Buds

→

Plantlet

Exam Tip:
For CBSE answers, remember the important examples:

Rhizopus → Spore Formation
Potato → Eyes / Stem Tuber
Ginger → Rhizome
Bryophyllum → Leaf-margin Buds
Rose → Cutting
Layering → Branch + Soil
Grafting → Stock + Scion