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

🌸 How Do Organisms Reproduce?

Reproductive Parts of a Flower | Class 10 Science | CBSE + Foundation + Competitive

How Do Organisms Reproduce? | Reproductive Parts of a Flower

1. Introduction – परिचय

English:
In flowering plants, the flower is the reproductive structure. A typical flower has four main whorls:

• Calyx
• Corolla
• Androecium
• Gynoecium

Among these, androecium and gynoecium are the main reproductive parts.

हिन्दी:
पुष्पीय पौधों में फूल जनन संरचना है। फूल के चार मुख्य चक्र होते हैं—दलपुंज (Calyx), पंखुड़ी-पुंज (Corolla), पुंकेसर-पुंज (Androecium) और जायांग (Gynoecium)।

2. Four Main Parts/Whorls of a Flower

Whorl	English Name	Main Function
Calyx	Sepals	Protects the developing flower bud
Corolla	Petals	Often attracts pollinators
Androecium	Stamens	Male reproductive part
Gynoecium	Carpel/Pistil	Female reproductive part

3. Animated Diagram – Typical Flower

🌸 Reproductive Parts of a Flower

4. Androecium – Male Reproductive Part

The androecium is the male reproductive whorl of a flower. Its individual units are called stamens. Each stamen generally consists of:

1. Filament
A slender stalk that supports the anther.

2. Anther
The enlarged structure at the top of the filament. It produces pollen grains.

Stamen = Filament + Anther

5. Anther – परागकोष

The anther is the pollen-producing part of the stamen. It contains pollen sacs where pollen grains develop. Pollen grains carry the male reproductive cells/gametes.

Exam Point: Anther → Pollen grains
Filament → Supports anther

6. Filament – तंतु

The filament is the stalk-like part of the stamen. Its major function is to support and position the anther so that pollen can be released and transferred efficiently.

7. Gynoecium – Female Reproductive Part

The gynoecium is the female reproductive whorl of a flower. It may consist of one or more carpels. A carpel/pistil has three main regions:

• Stigma
• Style
• Ovary

Pistil/Carpel = Stigma + Style + Ovary

8. Stigma – वर्तिकाग्र

The stigma is the topmost part of the pistil. Its main function is to receive pollen grains. The stigma is often sticky or has a suitable surface that helps pollen grains adhere and germinate.

9. Style – वर्तिका

The style is the slender region between stigma and ovary. After pollen germination, the pollen tube grows through the style towards the ovary. Therefore, the style provides a pathway for pollen tube growth.

10. Ovary – अंडाशय

The ovary is the basal swollen part of the pistil. It contains one or more ovules. After fertilisation, the ovary generally develops into a fruit.

Ovary → Fruit

11. Ovule – बीजांड

An ovule is present inside the ovary. The female gamete/egg cell is present within the embryo sac of the ovule. After fertilisation, the ovule generally develops into a seed.

Ovule → Seed

12. Reproductive Parts – Complete Comparison

Structure	Part of	Function
Stamen	Androecium	Male reproductive structure
Anther	Stamen	Produces pollen grains
Filament	Stamen	Supports anther
Pistil/Carpel	Gynoecium	Female reproductive structure
Stigma	Pistil	Receives pollen
Style	Pistil	Pathway for pollen tube
Ovary	Pistil	Contains ovules
Ovule	Ovary	Develops into seed after fertilisation

13. Bisexual Flower

A flower containing both stamens and carpels is called a bisexual flower. Examples:

• Hibiscus
• Mustard
• Rose

14. Unisexual Flower

A flower containing either stamens or carpels is called a unisexual flower. Examples include:

• Papaya
• Watermelon
• Maize flowers are unisexual

15. Pollination and Reproductive Parts

Pollination is the transfer of pollen grains from the anther to the stigma. Therefore, two important structures involved are:

Anther → Source of pollen
Stigma → Receiver of pollen

Anther → Pollen → Stigma

16. Fertilisation and Reproductive Parts

After pollination, a compatible pollen grain can germinate on the stigma. A pollen tube grows through the style towards the ovary. The male gametes reach the ovule. Fusion of male and female gametes forms the zygote.

Pollen ↓ Stigma ↓ Pollen Tube ↓ Style ↓ Ovary ↓ Ovule ↓ Fertilisation ↓ Zygote

17. After Fertilisation – Important Changes

Structure Before Fertilisation	Fate After Fertilisation
Zygote	Embryo
Ovule	Seed
Ovary	Fruit
Ovary wall	Generally forms fruit wall/pericarp

18. Most Important Exam Differences

Stamen	Pistil/Carpel
Male reproductive part	Female reproductive part
Consists of filament and anther	Consists of stigma, style and ovary
Produces pollen grains	Contains ovules
Part of androecium	Part of gynoecium

19. 30 MCQs – MCQ Practice

Q1. The reproductive structure of a flowering plant is:

A) Flower

B) Root

C) Leaf

D) Stem

Answer: A) Flower

Q2. The male reproductive part of a flower is:

A) Pistil

B) Stamen

C) Ovary

D) Stigma

Answer: B) Stamen

Q3. The anther is a part of:

A) Pistil

B) Ovary

C) Stamen

D) Sepal

Answer: C) Stamen

Q4. The female reproductive part of a flower is:

A) Anther

B) Filament

C) Stamen

D) Pistil

Answer: D) Pistil

Q5. Pollen grains are produced in:

A) Anther

B) Style

C) Ovary

D) Stigma

Answer: A) Anther

Q6. The filament mainly:

A) Produces ovules

B) Supports the anther

C) Receives pollen

D) Forms fruit

Answer: B) Supports the anther

Q7. Which part receives pollen grains?

A) Ovary

B) Style

C) Stigma

D) Anther

Answer: C) Stigma

Q8. The pollen tube generally grows through the:

A) Anther

B) Filament

C) Petal

D) Style

Answer: D) Style

Q9. Ovules are present inside the:

A) Ovary

B) Anther

C) Filament

D) Petal

Answer: A) Ovary

Q10. After fertilisation, the ovule generally becomes:

A) Fruit

B) Seed

C) Petal

D) Anther

Answer: B) Seed

Q11. After fertilisation, the ovary generally becomes:

A) Seed

B) Pollen

C) Fruit

D) Embryo

Answer: C) Fruit

Q12. A flower containing both stamens and carpels is:

A) Unisexual

B) Sterile

C) Vegetative

D) Bisexual

Answer: D) Bisexual

Q13. Which is a bisexual flower?

A) Hibiscus

B) Papaya

C) Watermelon

D) Male maize flower

Answer: A) Hibiscus

Q14. Which is a unisexual flower?

A) Hibiscus

B) Papaya

C) Mustard

D) Rose

Answer: B) Papaya

Q15. Androecium represents:

A) Female reproductive whorl

B) Protective whorl

C) Male reproductive whorl

D) Petals

Answer: C) Male reproductive whorl

Q16. Gynoecium represents:

A) Male reproductive whorl

B) Petals

C) Sepals

D) Female reproductive whorl

Answer: D) Female reproductive whorl

Q17. The pistil consists of:

A) Stigma, style and ovary

B) Anther and filament

C) Petal and sepal

D) Ovule and anther

Answer: A) Stigma, style and ovary

Q18. The stamen consists of:

A) Stigma and style

B) Anther and filament

C) Ovary and ovule

D) Petal and sepal

Answer: B) Anther and filament

Q19. The structure that contains the female gamete is associated with the:

A) Filament

B) Anther

C) Ovule

D) Petal

Answer: C) Ovule

Q20. Pollination is the transfer of pollen from:

A) Stigma to anther

B) Ovary to ovule

C) Style to stigma

D) Anther to stigma

Answer: D) Anther to stigma

Q21. Which structure is swollen at the base of the pistil?

A) Ovary

B) Style

C) Stigma

D) Filament

Answer: A) Ovary

Q22. The main function of the stigma is:

A) Pollen production

B) Pollen reception

C) Seed storage

D) Fruit formation

Answer: B) Pollen reception

Q23. Which structure supports the anther?

A) Style

B) Stigma

C) Filament

D) Ovary

Answer: C) Filament

Q24. Which structure contains ovules?

A) Anther

B) Filament

C) Stigma

D) Ovary

Answer: D) Ovary

Q25. Which sequence is correct?

A) Anther → Pollen → Stigma

B) Ovary → Pollen → Anther

C) Stigma → Pollen → Anther

D) Ovule → Pollen → Filament

Answer: A) Anther → Pollen → Stigma

Q26. Which structure develops into the embryo after fertilisation?

A) Ovule

B) Zygote

C) Ovary

D) Anther

Answer: B) Zygote

Q27. Which pair is correctly matched?

A) Anther — Female part

B) Ovary — Pollen production

C) Filament — Supports anther

D) Stigma — Produces ovules

Answer: C) Filament — Supports anther

Q28. Which pair is correctly matched?

A) Stigma — Produces pollen

B) Ovary — Produces petals

C) Filament — Contains ovules

D) Ovule — Develops into seed

Answer: D) Ovule — Develops into seed

Q29. Which two structures are directly involved in pollination?

A) Anther and stigma

B) Ovary and ovule

C) Filament and style

D) Sepal and petal

Answer: A) Anther and stigma

Q30. Which statement is correct?

A) Ovary becomes pollen

B) Ovule generally becomes seed

C) Anther becomes fruit

D) Filament becomes embryo

Answer: B) Ovule generally becomes seed

20. 30 Subjective Questions

2 Marks Q1. Name the male and female reproductive parts of a flower.

Answer: The male reproductive part is the stamen and the female reproductive part is the pistil/carpel.

2 Marks Q2. Name the two parts of a stamen.

Answer: Anther and filament.

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

Answer: Stigma, style and ovary.

2 Marks Q4. What is the function of anther?

Answer: The anther produces pollen grains containing the male reproductive cells.

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

Answer: The ovule generally develops into a seed.

3 Marks Q6. Describe the structure of a stamen.

Answer: A stamen consists of a filament and anther. The filament supports the anther, while the anther produces pollen grains.

3 Marks Q7. Describe the structure of a pistil.

Answer: The pistil consists of stigma, style and ovary. Stigma receives pollen, style provides a pathway for the pollen tube, and ovary contains ovules.

3 Marks Q8. What is the function of stigma?

Answer: Stigma receives pollen grains and provides a suitable surface for pollen adhesion and germination.

3 Marks Q9. What is the function of the style?

Answer: The style connects stigma and ovary and provides the pathway through which the pollen tube grows towards the ovary.

3 Marks Q10. What is the function of the ovary?

Answer: The ovary contains ovules. After fertilisation, it generally develops into a fruit.

4 Marks Q11. Differentiate between stamen and pistil.

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

4 Marks Q12. Explain the functions of anther and filament.

Answer: Anther produces pollen grains. Filament is the stalk that supports the anther and positions it for effective pollen release.

4 Marks Q13. Explain the functions of stigma, style and ovary.

Answer: Stigma receives pollen grains. Style provides a pathway for pollen tube growth. Ovary contains ovules and generally develops into a fruit after fertilisation.

4 Marks Q14. Differentiate between bisexual and unisexual flowers.

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

4 Marks Q15. Explain the relationship between ovary and ovule.

Answer: Ovules are structures present inside the ovary. The female gamete is present within the embryo sac of the ovule. After fertilisation, the ovule generally becomes a seed, while the ovary becomes a fruit.

5 Marks Q16. Draw and label the reproductive parts of a typical flower.

Answer: The diagram should show and label anther, filament, stigma, style, ovary and ovule. Stamen is the male reproductive part, while pistil/carpel is the female reproductive part.

5 Marks Q17. Explain the role of stamen in sexual reproduction.

Answer: The stamen is the male reproductive part. Its anther produces pollen grains. The filament supports the anther. Pollen grains carry the male reproductive cells and participate in fertilisation after reaching a suitable stigma.

5 Marks Q18. Explain the role of pistil in sexual reproduction.

Answer: The pistil consists of stigma, style and ovary. Stigma receives pollen, style provides a route for pollen tube growth, and ovary contains ovules. The female gamete is present within the embryo sac of the ovule.

5 Marks Q19. Explain what happens to flower parts after fertilisation.

Answer: The zygote develops into an embryo. The ovule develops into a seed and the ovary generally develops into a fruit. Other floral parts may wither and fall, although their exact fate can vary.

5 Marks Q20. Explain the role of reproductive parts in pollination and fertilisation.

Answer: The anther produces pollen. Pollination transfers pollen to the stigma. The pollen germinates and the pollen tube grows through the style to the ovary. Male gametes reach the ovule and fertilisation produces the zygote.

6 Marks Q21. Describe all the reproductive parts of a typical flower.

Answer:
1. Stamen: Male reproductive part.
2. Anther: Produces pollen grains.
3. Filament: Supports anther.
4. Pistil/Carpel: Female reproductive part.
5. Stigma: Receives pollen.
6. Style: Provides pathway for pollen tube.
7. Ovary: Contains ovules.

6 Marks Q22. Explain the structure and function of stamen and pistil.

Answer: Stamen consists of filament and anther and represents the male reproductive part. Anther produces pollen grains. Pistil consists of stigma, style and ovary and represents the female reproductive part. Stigma receives pollen, style supports pollen tube growth and ovary contains ovules.

6 Marks Q23. Explain the complete pathway of pollen from anther to ovule.

Answer: Pollen grains are produced in the anther. During pollination, they reach the stigma. A compatible pollen grain germinates and forms a pollen tube. The pollen tube grows through the style into the ovary and reaches the ovule, carrying male gametes.

6 Marks Q24. Explain the changes that occur after fertilisation.

Answer: Fertilisation forms a zygote. The zygote develops into an embryo. The ovule generally develops into a seed and the ovary generally develops into a fruit. The seed can later germinate under suitable conditions to form a new plant.

6 Marks Q25. Differentiate between androecium and gynoecium.

Answer: Androecium is the male reproductive whorl and consists of stamens. Each stamen has anther and filament. Gynoecium is the female reproductive whorl and consists of one or more carpels/pistils, each having stigma, style and ovary.

6 Marks Q26. Explain bisexual and unisexual flowers with examples.

Answer: A bisexual flower has both stamens and carpels in the same flower, e.g. hibiscus. A unisexual flower has either stamens or carpels, e.g. papaya. Thus, bisexual and unisexual flowers differ in the reproductive structures present in a single flower.

6 Marks Q27. Explain how the structure of a flower supports sexual reproduction.

Answer: The anther produces pollen, while the stigma receives it. The style provides a route for pollen tube growth. The ovary contains ovules where the female gamete is located within the embryo sac. These structures together enable pollination, pollen tube growth and fertilisation.

6 Marks Q28. Explain the importance of ovary and ovule in sexual reproduction.

Answer: The ovary is the basal part of the pistil and contains ovules. The ovule contains the embryo sac with the female gamete. Fertilisation occurs within the ovule. After fertilisation, the ovule generally becomes a seed and the ovary becomes a fruit.

6 Marks Q29. Explain the role of stigma, style and ovary during fertilisation.

Answer: Stigma receives pollen grains. A compatible pollen grain germinates and forms a pollen tube. The pollen tube grows through the style and reaches the ovary. The ovary contains ovules, where the male gamete eventually reaches the female gamete for fertilisation.

6 Marks Q30. Write the complete sequence of sexual reproduction using the reproductive parts of a flower.

Answer:
Anther → Pollen production → Stigma → Pollen germination → Pollen tube → Style → Ovary → Ovule → Male gamete + Female gamete → Fertilisation → Zygote → Embryo → Seed → New plant.

21. CBSE Golden Points ⭐

⭐ Flower = reproductive structure of flowering plants.

⭐ Androecium = male reproductive whorl.

⭐ Gynoecium = female reproductive whorl.

⭐ Stamen = Filament + Anther.

⭐ Anther = produces pollen grains.

⭐ Filament = supports anther.

⭐ Pistil/Carpel = Stigma + Style + Ovary.

⭐ Stigma = receives pollen.

⭐ Style = pathway for pollen tube.

⭐ Ovary = contains ovules.

⭐ Ovule = contains embryo sac with female gamete.

⭐ Ovule → Seed.

⭐ Ovary → Fruit.

⭐ Anther → Pollen.

⭐ Anther → Pollen → Stigma → Style → Ovary → Ovule.

22. One-Line Revision 🧠

🌸 Flower → Reproductive Structure

♂ Androecium → Male Whorl

🌼 Stamen → Male Part

🟡 Anther → Pollen

🌿 Filament → Supports Anther

♀ Gynoecium → Female Whorl

🎯 Stigma → Receives Pollen

🌱 Style → Pollen Tube Path

🥚 Ovary → Contains Ovules

🟡 Ovule → Seed

🍎 Ovary → Fruit

🧬 Fertilisation → Zygote

23. Diagram Labelling Practice

Important labels to learn:

1. Petal
2. Sepal
3. Anther
4. Filament
5. Stigma
6. Style
7. Ovary
8. Ovule
9. Stamen
10. Pistil/Carpel

24. Super-Fast Memory Trick 🚀

STAMEN = FA
Filament + Anther

PISTIL = SSO
Stigma + Style + Ovary

A → P → S → O → O

Anther → Pollen → Stigma → Ovary → Ovule

Ovule → Seed
Ovary → Fruit

25. Final Exam Revision

🌸 FLOWER ↓ ANDROECIUM
Stamen
Filament + Anther
Anther → Pollen ↓ GYNOECIUM
Pistil/Carpel
Stigma + Style + Ovary
Ovary → Ovules ↓ Pollination ↓ Pollen Tube ↓ Fertilisation ↓ Zygote ↓ Embryo ↓ Ovule → Seed
Ovary → Fruit