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NCERT Solutions for Class 12 Biology Chapter 2 Human Reproduction

NCERT Solutions for Class 12 Biology Chapter 2 Human Reproduction

Edited By Irshad Anwar | Updated on May 13, 2025 09:45 AM IST | #CBSE Class 12th

Reproduction is the fundamental biological process by which organisms produce their offspring and keep their generation in continuation. While the process varies in different species, in Humans, reproduction is a bit of a complex process involving a series of steps, beginning with the formation of gametes (gametogenesis)in both males and females, fertilization, pregnancy, and childbirth. To make these difficult concepts more understandable and have a clear vision, students can rely on the Human Reproduction NCERT Solutions for Class 12, which subject experts create to break down each process in detail.

This Story also Contains
  1. NCERT Solutions For Class 12 Biology Human Reproduction
  2. Access NCERT Solutions for Class 12 Biology Chapter 2 (Solved Exercise)
  3. Important Question from Chapter 2 Human Reproduction
  4. Approach to Solve Questions of Class 12 Chapter 2
  5. What Extra Should Students Study Beyond the NCERT for NEET?
  6. NCERT Solutions for Class 12 Biology- Chapter-wise
NCERT Solutions for Class 12 Biology Chapter 2 Human Reproduction
NCERT Solutions for Class 12 Biology Chapter 2 Human Reproduction

In addition to understanding human reproduction, you’ll explore various components that form the male and female reproductive systems, the hormonal regulation of processes like implantation and the menstrual cycle, and the entire process of childbirth with the help of images and flowcharts given in Class 12 biology chapter 2 NCERT solutions, your learning becomes more enjoyable and effective. Understanding key concepts will boost your skills and allow you to perform excellently in this topic. Consistent practice of Human Reproduction NCERT solutions will help you score well on the exam and also prepare effectively for competitive exams.

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NCERT Solutions For Class 12 Biology Human Reproduction

Download the free PDF below for detailed NCERT solutions to all questions from the chapter, helping you understand the topic of human reproduction thoroughly.

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Access NCERT Solutions for Class 12 Biology Chapter 2 (Solved Exercise)

Working through all the questions and answers given below will help you step ahead in achieving better marks in the upcoming board examination and further competitive exams.

Q1. Fill in the blanks:

(a) Humans reproduce _____________ (asexually/sexually)
(b) Humans are _____________ (oviparous, viviparous, ovoviviparous)
(c) Fertilisation is _____________ in humans (external/internal)
(d) Male and female gametes are _____________ (diploid/haploid)
(e) Zygote is _____________ (diploid/haploid)

(f) The process of release of ovum from a mature follicle is called _____________
(g) Ovulation is induced by a hormone called _____________
(h) The fusion of male and female gametes is called _____________
(i) Fertilisation takes place in _____________
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides a vascular connection between the foetus and uterus is called _____________

Answer:

(a) Humans reproduce sexually
(b) Humans are viviparous
(c) Fertilisation is internal in humans
(d) Male and female gametes are haploid
(e) Zygote is diploid

(f) The process of release of ovum from a mature follicle is called ovulation
(g) Ovulation is induced by a hormone called luteinizing hormone
(h) The fusion of male and female gametes is called fertilisation
(i)
Fertilisation takes place in a fallopian tube
(j) The zygote divides to form a blastocyst which is implanted in the uterus.
(k) The structure which provides a vascular connection between the foetus and the uterus is called the placenta

Q2. Draw a labelled diagram of the male reproductive system.

Answer:

The labelled diagram of the male reproductive system in human reproduction class 12 is as follows:

male reproductive system


Q4. Write two major functions of each of the testis and ovary.

Answer:

Functions of testis

  1. Testis produces spermatozoa, which are male gametes.
  2. In the testis, the male sex hormone testosterone is developed.

Functions of ovary

  1. The ovary produces an ovum by the process of oogenesis.
  2. Graffian follicles in the ovary produce a female sex hormone called estrogen.

Q5. Describe the structure of a seminiferous tubule.

Answer:

Seminiferous tubules are highly coiled structures present in testicular lobules. The seminiferous tubules are lined by two types of cells i.e. spermatogonia and Sertoli cells from inside. Spermatogonia are the male germ cells that form sperms through meiotic divisions followed by mitotic division, while Sertoli cells provide nutrition to the germ cells. The region outside the seminiferous tubules is called the interstitial space and it contains small blood vessels and Leydig cells. TheLeydig's cells secrete androgens.

seminiferous tubules

Q6 What is spermatogenesis? Briefly describe the process of spermatogenesis.

Answer:

Spermatogenesis is the process of the formation of spermatozoa from spermatogonia in the testes at the time of puberty. In this process, the spermatogonia present at the inner side of seminiferous tubules multiply by mitotic division and increase in number. Each spermatogonium contains 46 chromosomes. Spermatogonia form spermatocyte that undergoes meiotic division to produce secondary spermatocytes having 23 chromosomes. The secondary spermatocytes undergo 2nd meiotic division to form spermatids. The spermatids are transformed into spermatozoa by a process called spermiogenesis The sperm heads remain embedded in the Sertoli cells and are released from seminiferous tubules by the process of spermiation

spermatogenesis


Q7. Name the hormones involved in the regulation of spermatogenesis.

Answer:

Spermatogenesis is initiated due to an increase in the secretion of gonadotropin-releasing hormone by the hypothalamus. An increase in GnRH acts on the anterior pituitary and stimulates the secretion of two gonadotropins, LH (luteinizing hormone) and FSH (follicle-stimulating hormone). Among these, LH acts on Leydig cells and stimulates them to secrete androgens, whereas FSH acts on Sertoli cells and stimulates the secretion of some factors which help in spermiogenesis.

Q8. Define spermiogenesis and spermiation.

Answer:

Spermiogenesis- The spermatids are transformed into spermatozoa by the process called spermiogenesis.

Spermiation- The release of sperm from the seminiferous tubules occurs through a process called spermiation.


Q9. Draw a labelled diagram of sperm.

Answer:

The labelled diagram of human sperm is as follows:

human sperm

Q10. What are the major components of seminal plasma?

Answer:

The major components of seminal plasma are mucous, fructose, calcium, ascorbic acid, certain enzymes and some secretions of accessory glands.


Q11. What are the major functions of male accessory ducts and glands?

Answer:

Male accessory ducts include vasa efferentia, and epididymis. vas deferens and rete testis. They transport and temporarily store spermatozoa. Male accessory glands include the seminal vesicle, bulbourethral gland and prostate gland. These glands secrete fluids that lubricate the female reproductive system and sperm.

Q12 . What is oogenesis? Give a brief account of oogenesis.

Answer:

The process of the formation of mature female gametes is called oogenesis. It starts during the embryonic development stage when millions of oogonia (gamete mother cells) are formed in each fetal ovary. The gamete mother cells start division and enter into prophase-I of meiotic division and get temporally arrested. At this stage, they are called primary oocytes. Each primary oocyte is surrounded by a layer of granulosa cells, which is called the primary follicle The primary follicle gets surrounded by more layers of granulosa cells called secondary follicles that transform into the tertiary follicle that contains a fluid-filled cavity called an antrum. The tertiary follicles further change into the mature follicle called Graffian follicle which rapture to release secondary oocytes (ovum) from the ovary by the process of ovulation.

oogenesis


Q13 . Draw a labelled diagram of a section through the ovary.

Answer:

A labelled diagram of a section through the ovary is as follows:

ovary

Q14 . Draw a labelled diagram of a Graafian follicle.

Answer:

Diagram of Graffian follicle

graffian follicle


Q15. Name the functions of the following:

(a) Corpus luteum

Answer:

Corpus luteum-

It secretes progesterone. Progesterone is essential for the maintenance of endometrium.

(b) Endometrium

Answer:

Endometrium- Implantation of the fertilized ovum and many events of pregnancy take place in the endometrium.

(c) Acrosome

Answer:

Acrosome- It is filled with enzymes that hydrolyse the gg membrane thus, helping the sperm in penetration of the ovum during fertilisation of the ovum.

(d) Sperm tail

Answer:

Sperm tail- It provides motility to sperms.

(e) Fimbriae

Answer:

Fimbriae- After ovulation, it helps in the collection of the ovum.


Q16. Identify True/False statements. Correct each false statement to make it true.

(a) Androgens are produced by Sertoli cells. (True/False)

Answer:

Androgens are produced by Sertoli cells. (False).

Androgens are produced by Leydig's cells.

(b) Spermatozoa get nutrition from Sertoli cells. (True/False)

Answer:

Spermatozoa get nutrition from Sertoli cells. (True)

(c) Leydig cells are found in the variety (True/False)

Answer:

Leydig cells are found in the ovary. (False)

Leydig cells are found in seminiferous tubules of the testis

(d) Leydig cells synthesise androgens. (True/False)

Answer:

Leydig cells synthesise androgens. (True)

(e) Oogenesis takes place in the corpus luteum. (True/False)

Answer:

Oogenesis takes place in the corpus luteum. (False)

Oogenesis takes place in the ovary

(f) Menstrual cycle ceases during pregnancy

Answer:

The menstrual cycle ceases during pregnancy. (True)

(g) Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/False)

Answer:

The presence or absence of a hymen is not a reliable indicator of virginity or sexual experience. (True)


Q17 What is the menstrual cycle? Which hormones regulate the menstrual cycle?

Answer:

Menstrual cycle: The reproductive cycle in female primates is called the menstrual cycle. In a 28-day menstrual cycle, the menses tatakelace on cycle days 3-5. The menstrual cycle consists of phases like menstrual phase, follicular phase, ovulatory phase and luteal phase.

Menstrual phase

1. The production of LH from the anterior lobe of the pituitary gland is reduced.

2. The withdrawal of this hormone causes degeneration of the corpus luteum and, therefore progesterone production is reduced.

3. The production of oestrogen is also reduced in this phase.

4. The endometrium of the uterus breaks down & menstruation begins.

5. The cells of endometrium secretions, blood & unfertilised ovum constitute the menstrual flow.

Follicular phase-

1. This phase usually includes cycle days 6-13 or 14 in a 28 28-daycare.

2. The follfollicle-stimulatingmone (FSH) secreted by the anterior lobe of the pituitary gland stimulates the ovarian follicle to secrete oestrogens.

3. Oestrogen stimulates the proliferation of the endometrium of the uterine wall.

4. The endometrium becomes thicker by rapid cell multiplication and this is accompanied by an increase in uterine glands & blood vessels.

Ovulatory phase

1. Both LH & FSH attain a peak level in the middle of the cycle (about 14 th day).

2. Oestrogen concentration in the blood increases.

3. Rapid secretion of LH induces rupturing of the graffian follicle and thereby the release of the ovum. LH causes ovulation.

Luteal Phase:

1. Includes cycle days 15 to 28.

2. Corpus luteum secretes progesterone.

3. Endometrium thickens.

4. Uterine glands become secretory.

Hormonal control of the menstrual cycle.

1. FSH stimulates the ovarian follicles to produce oestrogens.

2. LH stimulates corpus luteum to secrete progesterone.

3. The menstrual phase is caused by the increased production of oestrogens.

4. LH causes ovulation

5. The proliferative phase is caused by the increased production of oestrogens.

6. The secretory phase is caused by increased production of progesterone.


Q18. What is parturition? Which hormones are involved in the induction of parturition?

Answer:

The process of delivery of the foetus is called parturition. The Oxytocin hormone causes a strong contraction of the uterine. Contraction of uterine becomes stronger and stronger by the stimulatory reflex between uterine contraction and oxytocin secretion. This leads to the expulsion of the baby out of the uterus through the birth canal.

Q19. In our society, women are often blamed for giving birth to daughters. Can you explain why this is not correct?

Answer:

The sex chromosome in a human female is XX while in a male it is XY. Thus, female produces haploid gametes having all X chromosomes but male produces two types of gametes with either X or Y. The sex of the child will be dependent on which sperm whether the one with X chromosomes or the one with Y chromosome fertilises the ovum with an X chromosome. Therefore, the sex of the baby is determined by the father's chromosomes, not the mother's.


Q20. How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?

Answer:

One ovum is released by a human ovary in a month. Identical twins are developed from a single egg. Hence, only one egg would have been released when the mother gave birth to identical twins. If the twins are fraternal then they must have been developed from two eggs.

Q21. How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?

Answer:

Dogs are polyovulatory animals and they release more than one egg at a particular time. So, a female dog with 6 puppies in one generation, releases 6 eggs.

NCERT Solutions for Class 12- Subject-wise

Important Question from Chapter 2 Human Reproduction

Here is a key question from the chapter that can help you strengthen your understanding and prepare well for exams.

Question 1: Seminal plasma, the fluid part of semen, is contributed by.

i. Seminal vesicle
ii. Prostate gland
iii. Urethra
iv. Bulbourethral gland

Options

  1. i and ii

  2. i, ii and iv

  3. ii, iii and iv

  4. i and iv

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Answer:

The urethra has no contribution to seminal plasma. The urethra has no contribution to seminal plasma, as it primarily serves as a passage for urine and semen. Seminal plasma is produced by accessory glands like the seminal vesicles, prostate gland, and bulbourethral glands. These glands secrete fluids that provide nutrients, lubrication, and protection to sperm. The urethra simply acts as a conduit for semen during ejaculation. Despite its role in sperm transport, it does not add any secretions to the seminal fluid.

Hence, the correct answer is option (2) (i), (ii) and (iv).

NCERT Exemplar Class 12 Solutions

JEE Main Important Mathematics Formulas

As per latest 2024 syllabus. Maths formulas, equations, & theorems of class 11 & 12th chapters

Approach to Solve Questions of Class 12 Chapter 2

To solve questions from Human Reproduction easily, follow these important points and understand the main concepts clearly.

  • Firstly, it's important for students to understand the male and female reproductive systems' structure and function well.
  • Students can learn about the hormonal control of reproductive processes, such as puberty and the menstrual cycle, after that.
  • Emphasis should be placed on the phases of gametogenesis – spermatogenesis and oogenesis – their differences and implications.
  • Learn the process of fertilisation, implantation, and embryonic development in order.
  • Practice well-labelled diagrams of male/female reproductive organs, gametes, and the development stages of the embryo.
  • Consistent practice of NEET and board questions of previous years to recognize frequently asked patterns and application-based questions.

Also, check the NCERT Books and the NCERT Syllabus here:

What Extra Should Students Study Beyond the NCERT for NEET?

Below is a table highlighting the key topics from the chapter that students should focus on for NEET preparation, beyond the NCERT.

TopicNEETNCERT
Primary and Secondary Sex Organs
The Male Reproductive System: Scrotum & Testes
Male Sex Accessory Ducts
Male Urethra & External Genitalia
Accessory Sex Glands of Males
Hormonal Control of Male Reproductive System
Spermatogenesis
Hormonal Control of Spermatogenesis
Structure of Sperm
Female Reproductive System: Ovaries
Fallopian Tube or Oviduct
Uterus & Vagina
External Genitalia of Females or Vulva
Mammary Gland or Breast
Oogenesis
Structure of Ovum
Menstrual Cycle
Fertilization
Events of Fertilization
Embryonic Development: Cleavage & Formation of Blastocyst
Implantation
Gastrulation
Extraembryonic Layers
Placentation
Types of Mammalian Placenta
Fate of Germ Layers
Organogenesis
Parturition
Lactation
Disorders of Human Reproductive System

By completing the Class 12 Human Reproduction NCERT Solutions, you will thoroughly understand key concepts like human reproduction, gamete formation, regulatory hormones, and fertilization. Regular practice will make you familiar with the question formats and enable you to answer difficult questions easily. Each concept is carefully prepared by experts to support you throughout your learning journey and resolve any doubts you may have. This chapter is very important for students as it contains a high weightage in both board exams as well as in competitive exams.

NCERT Solutions for Class 12 Biology- Chapter-wise

Here is a chapter-wise table with direct links to NCERT solutions for easy and quick access:


Frequently Asked Questions (FAQs)

1. What are the important points of male reproductive system given in human reproduction class 12?

The important points of the male reproductive system given in human reproduction class 12 are:

Male Reproductive System-    

  • The male reproductive system is composed of a pair of testes, the male sex accessory ducts and the accessory glands and external genitalia.   
  • Each testis has about 250 compartments called testicular lobules, and each lobule contains one to three highly coiled seminiferous tubules.   
  • Each seminiferous tubule is lined inside by spermatogonia and Sertoli cells.   
  • The spermatogonia undergo meiotic divisions leading to sperm formation, while Sertoli cells provide nutrition to the dividing germ cells. 
2. What are the important points of female reproductive system given in human reproduction class 12?

The important points of the female reproductive system given in human reproduction class 12 are:

Female Reproductive System-    

  • The female reproductive system consists of a pair of ovaries, a pair of oviducts, a uterus, a vagina, external genitalia, and a pair of mammary glands.   
  • The ovaries produce the female gamete (ovum) and some steroid hormones (ovarian hormones).   
  • Ovarian follicles in different stages of development are embedded in the stroma.   
  • The oviducts, uterus and vagina are female accessory ducts.   
  • The uterus has three layers namely perimetrium, myometrium and endometrium.  
3. What are the important topics of human reproduction class 12?

These are the important topics of NCERT solutions for class 12 biology chapter 2 Human Reproduction:

  • The Male Reproductive System   
  • The Female Reproductive System   
  • Gametogenesis   
  • Menstrual Cycle   
  • Fertilization and Implantation   
  • Pregnancy and Embryonic Development   
  • Parturition and Lactation  
4. Why you should go with human reproduction class 12 ncert pdf?

If you are confused or can't solve the question given in the NCERT then refer to the NCERT solutions for class 12 Biology chapter 2 human reproduction. It will make you clear with the concept behind the questions and will also help you in preparing for a competitive exam (NEET) as well as your school exam because NCERT is the foundation for any type of exam. NCERT solutions for class 12 biology chapter 2 human reproduction will also be of help in preparing for 12th board exam. You can access them offline anywhere, anytime by downloading the pdf. For doing well in the examination, use NCERT syllabus and the exercise provided in the NCERT Book. For solving problems, the NCERT exemplar is always of help.


5. How does spermatogenesis differ from oogenesis in humans?

Spermatogenesis and oogenesis are the processes of sperm and egg production respectively. They differ in location, and results. Spermatogenesis occurs continuously in the testes, and produces four sperm from one cell, while oogenesis occurs cyclically in the ovaries, producing one egg and three polar bodies from one cell.

6. How does fertilization take place in the female reproductive system?

Fertilization is the fusion of sperm and egg. It occurs in the fallopian tubes (oviducts), where the fertilized egg (zygote) then travels to the uterus for potential implantation and pregnancy.

7. What role do hormones play in the human reproductive system?

Hormones are crucial for human reproduction, regulating puberty, menstrual cycles, sperm production, and pregnancy, impacting both male and female reproductive systems.

8. How is the menstrual cycle regulated in females?

The menstrual cycle in females is regulated by a complex link of hormones, primarily from the hypothalamus, pituitary gland, and ovaries, leading to the cyclical release of an egg and the preparation of the uterine lining for upcoming pregnancy.

9. Why is the amniotic fluid important for fetal development?

Amniotic fluid also helps protect the fetus from infectious agents due to its inherent antibacterial properties. Additionally, it serves as a pool of fluid and nutrients for the fetus containing: proteins, electrolytes, immunoglobulins, and vitamins from the mother.

10. What are the common reproductive disorders in humans?

Common reproductive disorders in humans include infertility/subfertility, polycystic ovary syndrome (PCOS), endometriosis, uterine fibroids, and sexually transmitted infections (STIs) in both men and women, as well as cancers of the reproductive organs.

11. What is the significance of colostrum in newborn immunity?

At about the fifth or sixth month of pregnancy, the mammary glands begin producing colostrum, a very nutritious fluid representing the first milk to which newborns are exposed. Colostrum contains high amounts of immunoglobulin A, which is very crucial in the development of the newborn's immune system

12. What is the role of the corpus luteum in pregnancy?

The corpus luteum, a temporary structure formed after ovulation, plays a crucial role in early pregnancy by producing progesterone, which prepares the uterus for implantation and supports the early stages of fetal development.

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A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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