How Do Organisms Reproduce? | Female Reproductive System
Class 10 Science | Chapter 8 | CBSE + Foundation + Competitive Level
🌸 Female Reproductive System | महिला जनन तंत्र
1. Introduction | परिचय
English:
The female reproductive system is the organ system responsible for producing female gametes (ova/eggs), providing a suitable site for fertilisation, supporting implantation and pregnancy, and helping in childbirth.
हिन्दी:
महिला जनन तंत्र वह अंग तंत्र है जो मादा युग्मक (अंडाणु/ovum) का निर्माण करता है, निषेचन के लिए उपयुक्त स्थान प्रदान करता है तथा भ्रूण के आरोपण, गर्भावस्था और प्रसव में महत्वपूर्ण भूमिका निभाता है।
The female reproductive system is the organ system responsible for producing female gametes (ova/eggs), providing a suitable site for fertilisation, supporting implantation and pregnancy, and helping in childbirth.
हिन्दी:
महिला जनन तंत्र वह अंग तंत्र है जो मादा युग्मक (अंडाणु/ovum) का निर्माण करता है, निषेचन के लिए उपयुक्त स्थान प्रदान करता है तथा भ्रूण के आरोपण, गर्भावस्था और प्रसव में महत्वपूर्ण भूमिका निभाता है।
CBSE Key Point:
The major organs of the female reproductive system are:
Ovaries → Fallopian Tubes → Uterus → Cervix → Vagina
मुख्य अंग: अंडाशय → फैलोपियन नलिकाएँ → गर्भाशय → गर्भाशय ग्रीवा → योनि
The major organs of the female reproductive system are:
Ovaries → Fallopian Tubes → Uterus → Cervix → Vagina
मुख्य अंग: अंडाशय → फैलोपियन नलिकाएँ → गर्भाशय → गर्भाशय ग्रीवा → योनि
2. Main Parts and Functions | प्रमुख अंग एवं कार्य
| Organ / अंग | Structure / संरचना | Main Function / मुख्य कार्य |
|---|---|---|
| Ovaries अंडाशय |
Pair of female gonads | Produce ova and secrete female hormones such as estrogen and progesterone. |
| Fallopian Tubes / Oviducts फैलोपियन नलिकाएँ |
Two tubes connecting ovarian region with uterus | Receive the ovum; fertilisation usually occurs here. |
| Uterus गर्भाशय |
Muscular, hollow organ | Site of implantation and development of embryo/foetus. |
| Cervix गर्भाशय ग्रीवा |
Lower narrow part of uterus | Connects uterus with vagina and forms part of birth canal. |
| Vagina योनि |
Muscular canal | Receives sperm during sexual intercourse and acts as the birth canal. |
3. Animated Diagram – Female Reproductive System
4. Ovaries | अंडाशय
English:
The ovaries are a pair of female reproductive organs located in the pelvic region. They perform two major functions:
अंडाशय महिला के प्रमुख जनन अंग हैं। इनके दो मुख्य कार्य हैं:
The ovaries are a pair of female reproductive organs located in the pelvic region. They perform two major functions:
- Production and maturation of female gametes (ova).
- Secretion of female sex hormones such as estrogen and progesterone.
अंडाशय महिला के प्रमुख जनन अंग हैं। इनके दो मुख्य कार्य हैं:
- अंडाणुओं का निर्माण एवं परिपक्वता।
- एस्ट्रोजन तथा प्रोजेस्टेरोन जैसे महिला हार्मोनों का स्राव।
Important:
Ovaries are the female gonads.
महत्वपूर्ण:
अंडाशय महिला के जनन ग्रंथियाँ (female gonads) हैं।
Ovaries are the female gonads.
महत्वपूर्ण:
अंडाशय महिला के जनन ग्रंथियाँ (female gonads) हैं।
5. Ovum / Egg Cell | अंडाणु
English:
An ovum is the female gamete. It is much larger than a sperm cell and contains the genetic material contributed by the mother.
हिन्दी:
अंडाणु महिला युग्मक है। यह शुक्राणु की तुलना में काफी बड़ा होता है तथा इसमें मातृ आनुवंशिक पदार्थ उपस्थित होता है।
An ovum is the female gamete. It is much larger than a sperm cell and contains the genetic material contributed by the mother.
हिन्दी:
अंडाणु महिला युग्मक है। यह शुक्राणु की तुलना में काफी बड़ा होता है तथा इसमें मातृ आनुवंशिक पदार्थ उपस्थित होता है।
Human Ovum:
- Female gamete
- Usually non-motile
- Contains 23 chromosomes
- Fuses with sperm during fertilisation
6. Fallopian Tubes / Oviducts | फैलोपियन नलिकाएँ
English:
The fallopian tubes are a pair of tubes extending from the region of the ovaries towards the uterus. They help in receiving and transporting the ovum.
In humans, fertilisation usually occurs in the fallopian tube, particularly in its wider region called the ampulla.
हिन्दी:
फैलोपियन नलिकाएँ अंडाशय के क्षेत्र से गर्भाशय की ओर जाने वाली दो नलिकाएँ हैं। ये अंडाणु को ग्रहण करके गर्भाशय की ओर ले जाने में सहायता करती हैं। मनुष्यों में निषेचन सामान्यतः फैलोपियन नलिका में होता है।
The fallopian tubes are a pair of tubes extending from the region of the ovaries towards the uterus. They help in receiving and transporting the ovum.
In humans, fertilisation usually occurs in the fallopian tube, particularly in its wider region called the ampulla.
हिन्दी:
फैलोपियन नलिकाएँ अंडाशय के क्षेत्र से गर्भाशय की ओर जाने वाली दो नलिकाएँ हैं। ये अंडाणु को ग्रहण करके गर्भाशय की ओर ले जाने में सहायता करती हैं। मनुष्यों में निषेचन सामान्यतः फैलोपियन नलिका में होता है।
7. Site of Fertilisation | निषेचन का स्थान
English:
During sexual reproduction, a sperm may fuse with an ovum in the fallopian tube. This fusion is called fertilisation.
हिन्दी:
यौन जनन के दौरान फैलोपियन नलिका में शुक्राणु और अंडाणु का संलयन हो सकता है। इस संलयन को निषेचन (Fertilisation) कहते हैं।
During sexual reproduction, a sperm may fuse with an ovum in the fallopian tube. This fusion is called fertilisation.
हिन्दी:
यौन जनन के दौरान फैलोपियन नलिका में शुक्राणु और अंडाणु का संलयन हो सकता है। इस संलयन को निषेचन (Fertilisation) कहते हैं।
Sperm + Ovum → Zygote
शुक्राणु + अंडाणु → युग्मनज
शुक्राणु + अंडाणु → युग्मनज
8. Uterus | गर्भाशय
English:
The uterus is a hollow, muscular organ. It provides the site where the fertilised egg implants and the embryo develops. The inner lining of the uterus is called the endometrium.
हिन्दी:
गर्भाशय एक खोखला तथा पेशीय अंग है। निषेचित अंडाणु का आरोपण (implantation) गर्भाशय की आंतरिक परत में होता है और यहीं भ्रूण का विकास होता है। गर्भाशय की आंतरिक परत को एंडोमेट्रियम कहते हैं।
The uterus is a hollow, muscular organ. It provides the site where the fertilised egg implants and the embryo develops. The inner lining of the uterus is called the endometrium.
हिन्दी:
गर्भाशय एक खोखला तथा पेशीय अंग है। निषेचित अंडाणु का आरोपण (implantation) गर्भाशय की आंतरिक परत में होता है और यहीं भ्रूण का विकास होता है। गर्भाशय की आंतरिक परत को एंडोमेट्रियम कहते हैं।
9. Implantation | आरोपण
After fertilisation, the zygote undergoes repeated cell divisions and forms an embryo.
The developing embryo moves towards the uterus and attaches to the thickened lining of the uterus.
This attachment is called implantation.
निषेचन के बाद युग्मनज बार-बार विभाजित होकर भ्रूण बनाता है। विकसित होता हुआ भ्रूण गर्भाशय की मोटी आंतरिक परत से जुड़ जाता है। इस प्रक्रिया को आरोपण (Implantation) कहते हैं।
निषेचन के बाद युग्मनज बार-बार विभाजित होकर भ्रूण बनाता है। विकसित होता हुआ भ्रूण गर्भाशय की मोटी आंतरिक परत से जुड़ जाता है। इस प्रक्रिया को आरोपण (Implantation) कहते हैं।
Fertilisation
→
Zygote
→
Embryo
→
Implantation
10. Cervix | गर्भाशय ग्रीवा
The cervix is the narrow lower portion of the uterus.
It connects the uterus with the vagina and forms part of the birth canal.
गर्भाशय ग्रीवा गर्भाशय का संकीर्ण निचला भाग है। यह गर्भाशय को योनि से जोड़ती है और प्रसव मार्ग का एक भाग बनाती है।
गर्भाशय ग्रीवा गर्भाशय का संकीर्ण निचला भाग है। यह गर्भाशय को योनि से जोड़ती है और प्रसव मार्ग का एक भाग बनाती है।
11. Vagina | योनि
The vagina is a muscular canal that:
- Receives sperm during sexual intercourse.
- Provides a passage for menstrual flow.
- Acts as the birth canal during childbirth.
- संभोग के दौरान शुक्राणुओं को ग्रहण करती है।
- मासिक धर्म के रक्त के बाहर निकलने का मार्ग है।
- प्रसव के समय जन्म मार्ग के रूप में कार्य करती है।
12. Female Reproductive Hormones | महिला जनन हार्मोन
| Hormone | Source | Main Function |
|---|---|---|
| Estrogen | Ovaries | Helps in development of female secondary sexual characteristics and regulation of the reproductive cycle. |
| Progesterone | Ovary, especially corpus luteum after ovulation | Helps maintain the uterine lining and supports pregnancy. |
| FSH | Pituitary gland | Stimulates growth and maturation of ovarian follicles. |
| LH | Pituitary gland | Helps trigger ovulation and supports formation of corpus luteum. |
13. Puberty in Girls | लड़कियों में यौवनारंभ
Puberty is the stage when the reproductive organs mature and the body begins to show secondary sexual characteristics.
Common changes include:
Common changes include:
- Development of breasts.
- Growth of hair in armpits and pubic region.
- Changes in body shape.
- Maturation of reproductive organs.
- Beginning of menstrual cycles.
- Emotional and hormonal changes.
14. Menstrual Cycle | मासिक धर्म चक्र
The menstrual cycle is a series of cyclic changes in the female reproductive system.
A typical cycle is often described as about 28 days, but the actual length can vary considerably among individuals.
हिन्दी:
मासिक धर्म चक्र महिला के जनन तंत्र में होने वाले चक्रीय परिवर्तनों की श्रृंखला है। सामान्यतः इसे लगभग 28 दिनों का बताया जाता है, लेकिन वास्तविक अवधि व्यक्ति-व्यक्ति में बदल सकती है।
हिन्दी:
मासिक धर्म चक्र महिला के जनन तंत्र में होने वाले चक्रीय परिवर्तनों की श्रृंखला है। सामान्यतः इसे लगभग 28 दिनों का बताया जाता है, लेकिन वास्तविक अवधि व्यक्ति-व्यक्ति में बदल सकती है।
15. Major Events of Menstrual Cycle | मासिक चक्र की प्रमुख घटनाएँ
| Stage | Main Event |
|---|---|
| Menstruation | If fertilisation does not occur, the thickened uterine lining breaks down and is discharged. |
| Follicular Phase | Ovarian follicles develop; estrogen levels generally rise. |
| Ovulation | Release of a mature ovum from an ovary, generally around the middle of a typical cycle. |
| Luteal Phase | Corpus luteum develops and secretes progesterone, helping maintain the uterine lining. |
16. Ovulation | अंडोत्सर्जन
Ovulation is the release of a mature egg/ovum from an ovarian follicle.
In a typical 28-day cycle, ovulation occurs approximately around day 14, but the exact timing varies.
हिन्दी:
परिपक्व अंडाणु का अंडाशय से बाहर निकलना अंडोत्सर्जन (Ovulation) कहलाता है।
हिन्दी:
परिपक्व अंडाणु का अंडाशय से बाहर निकलना अंडोत्सर्जन (Ovulation) कहलाता है।
Competitive Point:
A rapid rise in luteinising hormone (LH), called the LH surge, triggers ovulation.
A rapid rise in luteinising hormone (LH), called the LH surge, triggers ovulation.
17. Corpus Luteum | कॉर्पस ल्यूटियम
After ovulation, the ruptured ovarian follicle forms a temporary endocrine structure called the corpus luteum.
It mainly secretes progesterone, which helps maintain the uterine lining.
अंडोत्सर्जन के बाद टूटा हुआ ovarian follicle एक अस्थायी अंतःस्रावी संरचना बनाता है जिसे Corpus Luteum कहते हैं। यह मुख्य रूप से प्रोजेस्टेरोन का स्राव करता है।
अंडोत्सर्जन के बाद टूटा हुआ ovarian follicle एक अस्थायी अंतःस्रावी संरचना बनाता है जिसे Corpus Luteum कहते हैं। यह मुख्य रूप से प्रोजेस्टेरोन का स्राव करता है।
18. If Fertilisation Does Not Occur | यदि निषेचन नहीं होता
If fertilisation does not occur, the corpus luteum degenerates, hormone levels fall and the thickened uterine lining is shed.
This shedding produces menstrual bleeding.
यदि निषेचन नहीं होता है तो कॉर्पस ल्यूटियम का अपघटन होता है, हार्मोन का स्तर कम होता है और गर्भाशय की मोटी परत टूटकर बाहर निकलती है। इसे मासिक धर्म कहते हैं।
यदि निषेचन नहीं होता है तो कॉर्पस ल्यूटियम का अपघटन होता है, हार्मोन का स्तर कम होता है और गर्भाशय की मोटी परत टूटकर बाहर निकलती है। इसे मासिक धर्म कहते हैं।
19. If Fertilisation Occurs | यदि निषेचन हो जाता है
If fertilisation occurs, the resulting zygote undergoes repeated cell divisions and develops into an embryo.
The embryo reaches the uterus and becomes implanted in the uterine lining.
Hormonal support helps maintain the uterine lining during pregnancy.
यदि निषेचन हो जाता है तो बनने वाला युग्मनज लगातार विभाजित होकर भ्रूण बनाता है। भ्रूण गर्भाशय में पहुँचकर उसकी आंतरिक परत में आरोपित हो जाता है।
यदि निषेचन हो जाता है तो बनने वाला युग्मनज लगातार विभाजित होकर भ्रूण बनाता है। भ्रूण गर्भाशय में पहुँचकर उसकी आंतरिक परत में आरोपित हो जाता है।
20. Reproductive Process Flow Chart
Ovary
→
Ovulation
→
Fallopian Tube
→
Fertilisation
→
Zygote
→
Embryo
→
Uterus
→
Implantation
21. Fertilisation vs Implantation
| Fertilisation | Implantation |
|---|---|
| Fusion of male and female gametes. | Attachment of developing embryo to uterine lining. |
| Usually occurs in the fallopian tube. | Occurs in the uterus. |
| Produces a zygote. | Allows the embryo to establish within the uterine lining. |
22. Formation of Female Gamete – Basic Concept
The formation and maturation of female gametes is called oogenesis.
In humans, ovarian follicles contain developing oocytes. Usually one dominant follicle releases an ovum during ovulation in a menstrual cycle.
हिन्दी:
महिला युग्मक के निर्माण एवं परिपक्वता की प्रक्रिया को Oogenesis (अंडजनन) कहते हैं।
हिन्दी:
महिला युग्मक के निर्माण एवं परिपक्वता की प्रक्रिया को Oogenesis (अंडजनन) कहते हैं।
23. Chromosome Number | गुणसूत्र संख्या
| Cell | Chromosome Number |
|---|---|
| Human body cell | 46 (diploid) |
| Human sperm | 23 (haploid) |
| Human ovum | 23 (haploid) |
| Zygote | 46 (diploid) |
23 chromosomes from sperm + 23 chromosomes from ovum = 46 chromosomes in zygote
24. Role of Female Gamete in Sex Determination
The human ovum normally carries an X chromosome.
Sperm can carry either X or Y chromosome.
Therefore:
| Sperm | Ovum | Zygote |
|---|---|---|
| X | X | XX |
| Y | X | XY |
CBSE Point:
The sex chromosome contributed by the sperm determines whether the zygote is XX or XY.
The sex chromosome contributed by the sperm determines whether the zygote is XX or XY.
25. Diagram Labelling Practice | आरेख लेबलिंग अभ्यास
1. Ovary – अंडाशय
2. Fallopian Tube – फैलोपियन नलिका
3. Uterus – गर्भाशय
4. Cervix – गर्भाशय ग्रीवा
5. Vagina – योनि
6. Ovum – अंडाणु
26. 30 MCQs – CBSE + Foundation + Competitive
Q1. Which is the female gonad in humans?
A) Ovary
B) Uterus
C) Vagina
D) Cervix
Answer: A) Ovary
Q2. The female gamete in humans is called:
A) Zygote
B) Ovum
C) Embryo
D) Follicle
Answer: B) Ovum
Q3. Fertilisation in humans usually occurs in the:
A) Uterus
B) Vagina
C) Fallopian tube
D) Ovary
Answer: C) Fallopian tube
Q4. Implantation normally occurs in the:
A) Ovary
B) Fallopian tube
C) Cervix
D) Uterus
Answer: D) Uterus
Q5. Which hormone helps maintain the uterine lining during pregnancy?
A) Progesterone
B) Adrenaline
C) Thyroxine
D) Insulin
Answer: A) Progesterone
Q6. Which organ produces ova?
A) Uterus
B) Ovary
C) Cervix
D) Vagina
Answer: B) Ovary
Q7. The inner lining of the uterus is called:
A) Myometrium
B) Perimetrium
C) Endometrium
D) Epididymis
Answer: C) Endometrium
Q8. Which structure connects the uterus to the vagina?
A) Ovary
B) Fallopian tube
C) Endometrium
D) Cervix
Answer: D) Cervix
Q9. Ovulation means:
A) Release of mature ovum from ovary
B) Fusion of gametes
C) Implantation of embryo
D) Formation of placenta
Answer: A) Release of mature ovum from ovary
Q10. Which hormone surge triggers ovulation?
A) FSH
B) LH
C) Insulin
D) Thyroxine
Answer: B) LH
Q11. Which hormone is mainly secreted by the corpus luteum?
A) Insulin
B) Testosterone
C) Progesterone
D) Adrenaline
Answer: C) Progesterone
Q12. The birth canal includes the:
A) Ovary only
B) Fallopian tube only
C) Uterus only
D) Vagina
Answer: D) Vagina
Q13. How many chromosomes are normally present in a human ovum?
A) 23
B) 46
C) 44
D) 22
Answer: A) 23
Q14. The zygote formed after normal human fertilisation contains:
A) 23 chromosomes
B) 46 chromosomes
C) 22 chromosomes
D) 92 chromosomes
Answer: B) 46 chromosomes
Q15. Which hormone is associated with female secondary sexual characteristics?
A) Insulin
B) Adrenaline
C) Estrogen
D) Growth hormone
Answer: C) Estrogen
Q16. If fertilisation does not occur, the uterine lining generally:
A) Becomes a sperm
B) Produces an ovum
C) Becomes the placenta immediately
D) Breaks down and is shed
Answer: D) Breaks down and is shed
Q17. The process of release of an ovum is:
A) Ovulation
B) Fertilisation
C) Implantation
D) Menstruation
Answer: A) Ovulation
Q18. The corpus luteum develops from the:
A) Uterine lining
B) Ruptured ovarian follicle
C) Cervix
D) Vagina
Answer: B) Ruptured ovarian follicle
Q19. Which structure provides the main site for embryo development?
A) Ovary
B) Cervix
C) Uterus
D) Vagina
Answer: C) Uterus
Q20. The female gamete normally carries:
A) X chromosome
B) Y chromosome
C) Both X and Y
D) No sex chromosome
Answer: A) X chromosome
Q21. Which pituitary hormone stimulates growth and maturation of ovarian follicles?
A) LH
B) FSH
C) ADH
D) TSH
Answer: B) FSH
Q22. Oogenesis refers to:
A) Formation of sperm
B) Fusion of sperm and ovum
C) Formation and maturation of female gametes
D) Implantation
Answer: C) Formation and maturation of female gametes
Q23. Which is NOT a function of the uterus?
A) Implantation
B) Supporting embryo development
C) Providing a site for pregnancy
D) Producing ova
Answer: D) Producing ova
Q24. Menstruation is most directly associated with:
A) Shedding of uterine lining
B) Fertilisation
C) Ovulation only
D) Formation of sperm
Answer: A) Shedding of uterine lining
Q25. The hormone estrogen is mainly secreted by:
A) Thyroid
B) Ovaries
C) Adrenal glands
D) Pancreas
Answer: B) Ovaries
Q26. A zygote is formed by:
A) Division of an ovum
B) Division of sperm
C) Fusion of male and female gametes
D) Implantation
Answer: C) Fusion of male and female gametes
Q27. Which sequence is correct?
A) Ovary → Ovulation → Fallopian tube → Uterus
B) Uterus → Ovary → Vagina → Fallopian tube
C) Vagina → Ovary → Uterus → Fallopian tube
D) Cervix → Ovary → Uterus → Vagina
Answer: A) Ovary → Ovulation → Fallopian tube → Uterus
Q28. Which structure is directly associated with implantation?
A) Ovary
B) Endometrium
C) Fallopian tube
D) Vagina
Answer: B) Endometrium
Q29. Which statement is correct?
A) Ovulation and fertilisation mean the same thing.
B) Implantation occurs in the ovary.
C) Fertilisation usually occurs before implantation.
D) Menstruation always means fertilisation has occurred.
Answer: C) Fertilisation usually occurs before implantation.
Q30. Which combination is correctly matched?
A) Ovary – ovum production
B) Uterus – sperm production
C) Vagina – ovum production
D) Cervix – testosterone production
Answer: A) Ovary – ovum production
27. 30 Subjective Questions with Answers
2 Marks
Q1. What is the female reproductive system?
Answer: It is the organ system responsible for producing female gametes, supporting fertilisation, implantation and reproduction.
हिन्दी: यह मादा युग्मक के निर्माण तथा निषेचन, आरोपण और प्रजनन में सहायता करने वाला अंग तंत्र है।
हिन्दी: यह मादा युग्मक के निर्माण तथा निषेचन, आरोपण और प्रजनन में सहायता करने वाला अंग तंत्र है।
2 Marks
Q2. Name the female gonads.
Answer: Ovaries are the female gonads.
2 Marks
Q3. What is ovulation?
Answer: Ovulation is the release of a mature ovum from an ovarian follicle.
2 Marks
Q4. Where does fertilisation usually occur in humans?
Answer: Fertilisation usually occurs in the fallopian tube.
2 Marks
Q5. What is implantation?
Answer: Implantation is the attachment of the developing embryo to the lining of the uterus.
3 Marks
Q6. Write three functions of the ovaries.
- Produce female gametes.
- Support maturation of ovarian follicles.
- Secrete hormones such as estrogen and progesterone.
3 Marks
Q7. Write three functions of the uterus.
- Receives the implanted embryo.
- Provides a suitable environment for embryo/foetus development.
- Its muscular wall helps in childbirth.
3 Marks
Q8. Differentiate between ovulation and fertilisation.
| Ovulation | Fertilisation |
|---|---|
| Release of mature ovum from ovary. | Fusion of sperm and ovum. |
| Occurs during the ovarian cycle. | Usually occurs in fallopian tube. |
3 Marks
Q9. What is the role of the fallopian tube?
It receives the ovum, helps transport it towards the uterus and is usually the site where fertilisation occurs.
3 Marks
Q10. What happens when fertilisation does not occur?
The corpus luteum degenerates, hormone levels fall and the thickened uterine lining is shed as menstrual flow.
4 Marks
Q11. Explain the structure and functions of the female reproductive system.
The major organs are ovaries, fallopian tubes, uterus, cervix and vagina.
Ovaries produce ova and female hormones. Fallopian tubes receive and transport the ovum and are usually the site of fertilisation. The uterus supports implantation and development of the embryo. The cervix connects uterus and vagina. The vagina acts as a reproductive canal and birth canal.
Ovaries produce ova and female hormones. Fallopian tubes receive and transport the ovum and are usually the site of fertilisation. The uterus supports implantation and development of the embryo. The cervix connects uterus and vagina. The vagina acts as a reproductive canal and birth canal.
4 Marks
Q12. Explain the role of estrogen and progesterone.
Estrogen: Helps regulate the reproductive cycle and development of female secondary sexual characteristics.
Progesterone: Helps maintain the uterine lining and supports pregnancy.
Progesterone: Helps maintain the uterine lining and supports pregnancy.
4 Marks
Q13. Explain menstruation.
If fertilisation does not occur, the hormonal support of the uterine lining decreases. The thickened endometrium breaks down and is shed through the vagina as menstrual flow.
4 Marks
Q14. What is the role of the cervix?
The cervix is the lower narrow part of the uterus. It connects the uterus with the vagina and forms part of the birth canal.
4 Marks
Q15. Explain the significance of the menstrual cycle.
The menstrual cycle prepares the female reproductive system for possible fertilisation and pregnancy. It involves ovarian changes, ovulation and cyclic changes in the uterine lining. If fertilisation does not occur, menstruation takes place.
5 Marks
Q16. Explain the sequence from ovulation to implantation.
- A mature ovum is released from the ovary.
- The ovum enters the fallopian tube.
- If sperm is present, fertilisation may occur.
- A zygote forms and divides repeatedly.
- The developing embryo reaches the uterus and implants in the uterine lining.
5 Marks
Q17. Describe the menstrual cycle in brief.
The cycle begins with menstruation. During the follicular phase, ovarian follicles develop and estrogen rises. Around the middle of a typical 28-day cycle, LH surge triggers ovulation. After ovulation, the corpus luteum produces progesterone. If fertilisation does not occur, hormone levels fall and menstruation begins.
5 Marks
Q18. Explain fertilisation and zygote formation.
Fertilisation is the fusion of a male gamete with a female gamete. In humans, it usually occurs in the fallopian tube. The sperm and ovum each contribute 23 chromosomes, producing a diploid zygote with 46 chromosomes. The zygote then undergoes repeated cell divisions.
5 Marks
Q19. Explain the importance of the uterus during reproduction.
The uterus has a thick lining that can support implantation. After implantation, it provides the environment for embryo development. The uterine wall also undergoes muscular contractions during childbirth.
5 Marks
Q20. Differentiate between fertilisation and implantation.
Fertilisation is the fusion of sperm and ovum and usually occurs in the fallopian tube. It produces a zygote.
Implantation is the attachment of the developing embryo to the uterine lining and occurs in the uterus.
Implantation is the attachment of the developing embryo to the uterine lining and occurs in the uterus.
6 Marks
Q21. Draw and label the female reproductive system and explain its major parts.
The diagram should be labelled:
Ovary, Fallopian tube, Uterus, Cervix and Vagina.
Ovaries produce ova and hormones; fallopian tubes receive and transport ova and are usually the site of fertilisation; uterus supports implantation and embryo development; cervix connects uterus and vagina; vagina acts as the birth canal.
Ovary, Fallopian tube, Uterus, Cervix and Vagina.
Ovaries produce ova and hormones; fallopian tubes receive and transport ova and are usually the site of fertilisation; uterus supports implantation and embryo development; cervix connects uterus and vagina; vagina acts as the birth canal.
6 Marks
Q22. Explain the complete pathway from ovum formation to implantation.
Ova develop in ovarian follicles. During ovulation, a mature ovum is released from the ovary. It enters the fallopian tube. If fertilisation occurs, a zygote forms. Repeated cell division produces an embryo. The embryo moves towards the uterus and implants in the endometrium.
6 Marks
Q23. Explain what happens during ovulation and the role of LH.
During the ovarian cycle, a mature follicle develops. A rapid increase in LH concentration, called the LH surge, triggers ovulation. The mature ovum is released from the ovarian follicle. The remaining follicular tissue develops into the corpus luteum.
6 Marks
Q24. Explain the hormonal regulation of the female reproductive cycle.
FSH supports ovarian follicle development. Developing follicles produce estrogen. A high estrogen level contributes to the LH surge, which triggers ovulation. After ovulation, the corpus luteum produces progesterone. Progesterone helps maintain the uterine lining. If pregnancy does not occur, corpus luteum degenerates and hormone levels fall, leading to menstruation.
6 Marks
Q25. Explain the role of ovaries, fallopian tubes and uterus in reproduction.
Ovaries: Produce ova and female hormones.
Fallopian tubes: Receive and transport the ovum and usually provide the site for fertilisation.
Uterus: Receives the embryo during implantation and supports its development.
Fallopian tubes: Receive and transport the ovum and usually provide the site for fertilisation.
Uterus: Receives the embryo during implantation and supports its development.
6 Marks
Q26. Explain what happens when fertilisation does and does not occur.
If fertilisation occurs: A zygote forms, divides repeatedly, develops into an embryo and implants in the uterus. Hormonal support maintains the uterine lining.
If fertilisation does not occur: The corpus luteum degenerates, hormone levels decline and the uterine lining is shed during menstruation.
If fertilisation does not occur: The corpus luteum degenerates, hormone levels decline and the uterine lining is shed during menstruation.
6 Marks
Q27. Explain the chromosome number in sperm, ovum and zygote.
Human sperm and ovum are haploid and contain 23 chromosomes each. During fertilisation, they fuse and restore the diploid chromosome number of 46 in the zygote.
23 + 23 = 46
23 + 23 = 46
6 Marks
Q28. Explain the importance of the menstrual cycle in human reproduction.
The menstrual cycle coordinates ovarian and uterine changes. An ovum matures and may be released by ovulation. At the same time, the uterine lining becomes suitable for possible implantation. If fertilisation does not occur, the lining is shed. Thus, the cycle prepares the reproductive system for possible pregnancy.
6 Marks
Q29. Why is the uterus called the main site for development of the embryo?
The uterus has a thick, vascular lining suitable for implantation. After implantation, the embryo develops inside the uterus and receives support through the maternal reproductive system. The muscular uterine wall also participates in childbirth.
6 Marks
Q30. Explain the complete female reproductive process from ovulation to pregnancy.
A mature ovum is released during ovulation. It enters the fallopian tube. If a sperm fuses with it, fertilisation occurs and a zygote is formed. The zygote divides repeatedly and develops into an embryo. The embryo reaches the uterus and implants in the endometrium. Continued hormonal support allows pregnancy to be maintained and the embryo develops into a foetus.
28. HOTS / Competency-Based Questions
HOTS 1: A woman has a normal ovulation but both fallopian tubes are blocked. How can this affect natural fertilisation?
Answer: Blocked fallopian tubes can prevent sperm and ovum from meeting, so natural fertilisation may be difficult or prevented.
HOTS 2: Why is the uterus richly supplied with blood vessels?
Answer: The uterine lining needs a good blood supply to support implantation and the developing embryo.
HOTS 3: Why does menstruation generally stop during pregnancy?
Answer: Pregnancy-associated hormonal signals maintain the uterine lining instead of allowing it to undergo the normal shedding associated with menstruation.
HOTS 4: Why are ovaries considered both reproductive and endocrine organs?
They produce ova as reproductive organs and secrete hormones such as estrogen and progesterone as endocrine organs.
29. CBSE Golden Points | बोर्ड परीक्षा के महत्वपूर्ण बिंदु
1 Ovary is the female gonad.
2 Ovary produces ova.
3 Ovary secretes estrogen and progesterone.
4 Fallopian tube is usually the site of fertilisation.
5 Uterus is the site of implantation.
6 Endometrium is the inner lining of uterus.
7 Cervix connects uterus and vagina.
8 Vagina acts as birth canal.
9 Ovulation = release of mature ovum.
10 LH surge triggers ovulation.
11 Corpus luteum secretes progesterone.
12 Menstruation occurs when pregnancy does not result.
13 Human ovum contains 23 chromosomes.
14 Human zygote normally contains 46 chromosomes.
15 Fertilisation occurs before implantation.
30. Memory Trick | याद रखने की ट्रिक
O → F → U → C → V
O = Ovary
F = Fallopian Tube
U = Uterus
C = Cervix
V = Vagina
Hindi Trick:
“अंडा → नली → घर → द्वार → मार्ग”
Ovary → Fallopian Tube → Uterus → Cervix → Vagina
O = Ovary
F = Fallopian Tube
U = Uterus
C = Cervix
V = Vagina
Hindi Trick:
“अंडा → नली → घर → द्वार → मार्ग”
Ovary → Fallopian Tube → Uterus → Cervix → Vagina
31. One-Line Revision | एक पंक्ति में पूरा अध्याय
Ovary produces ovum → Ovulation releases ovum → Fallopian tube is usual site of fertilisation → Zygote forms → Embryo develops → Uterus supports implantation and pregnancy.
32. Final Summary | अंतिम सारांश
English:
The female reproductive system consists mainly of ovaries, fallopian tubes, uterus, cervix and vagina. Ovaries produce ova and female hormones. During ovulation, a mature ovum is released. If sperm meets the ovum in the fallopian tube, fertilisation produces a zygote. The zygote develops into an embryo, which reaches the uterus and implants in the endometrium. Hormonal changes regulate the menstrual cycle and support pregnancy when fertilisation occurs.
हिन्दी: महिला जनन तंत्र में मुख्यतः अंडाशय, फैलोपियन नलिकाएँ, गर्भाशय, गर्भाशय ग्रीवा तथा योनि शामिल हैं। अंडाशय अंडाणु और महिला हार्मोन बनाते हैं। अंडोत्सर्जन के समय परिपक्व अंडाणु बाहर निकलता है। यदि फैलोपियन नलिका में शुक्राणु और अंडाणु का संलयन होता है तो युग्मनज बनता है। युग्मनज विकसित होकर भ्रूण बनाता है और भ्रूण गर्भाशय की आंतरिक परत में आरोपित होता है। हार्मोन मासिक धर्म चक्र तथा गर्भावस्था के दौरान होने वाले परिवर्तनों को नियंत्रित करते हैं।
हिन्दी: महिला जनन तंत्र में मुख्यतः अंडाशय, फैलोपियन नलिकाएँ, गर्भाशय, गर्भाशय ग्रीवा तथा योनि शामिल हैं। अंडाशय अंडाणु और महिला हार्मोन बनाते हैं। अंडोत्सर्जन के समय परिपक्व अंडाणु बाहर निकलता है। यदि फैलोपियन नलिका में शुक्राणु और अंडाणु का संलयन होता है तो युग्मनज बनता है। युग्मनज विकसित होकर भ्रूण बनाता है और भ्रूण गर्भाशय की आंतरिक परत में आरोपित होता है। हार्मोन मासिक धर्म चक्र तथा गर्भावस्था के दौरान होने वाले परिवर्तनों को नियंत्रित करते हैं।
Class 10 Science | How Do Organisms Reproduce? | Female Reproductive System
CBSE • Foundation • Competitive Exam Preparation
CBSE • Foundation • Competitive Exam Preparation
