NCERT Solutions For Class 12 Biology Chapter 3: Human Reproduction

Education Journalist | Study Abroad Lead

NCERT Solutions for Class 12 Biology Chapter 3 Human Reproduction is provided in this article. It includes all the important definitions, concepts, and methodologies which will prove to be extremely beneficial for the students appearing for CBSE Class 12 Exam 2022-23. The important topics that are included in this chapter are:

Expected no. of Questions: 1-2 questions of around 3 marks.

Download pdf: NCERT Solutions for Class 12 Biology Chapter 3 Human Reproduction

NCERT Solutions for Class 12 Biology 3

NCERT Solution

Class 12 Biology Chapter 3 Human Reproduction: Important Topics

Human reproduction can be defined as the biological process through which humans give birth to babies and continue to maintain their species. Human reproduction requires the interaction between two parents of the opposite sex to reproduce sexually. This chapter comprises some important topic, which are:

Male and Female Reproductive Systems

Human reproduction occurs when both the male and female gametes combine, which are produced in their respective reproductive systems.

Male Reproductive Systems: Sperms are the male gametes in a male reproductive system. They are primarily unicellular in size, and bear a head-like structure, middle piece, and also consist of a tail.
Female Reproductive Systems: The female reproductive system is the core location where the fertilized zygote develops into a fetus, and ultimately leads to the birth of offspring. Apart from that, the female reproductive system is essential for the formation of female sex hormones which help balance the reproductive cycle.

Implantation

Implantation refers to the process that happens in the earlier stages of pregnancy. When the female egg cell gets fertilized by the sperm, it travels towards the uterus through the fallopian tube.

Parturition

Parturition explains the process of giving birth to a child as well as the placenta from the uterus to the vagina. It is a hormonal process of expulsion of a fully formed fetus from the uterus to the vagina to the outside world. It is also known as labor, delivery, and childbirth. It is the final stage of pregnancy which occurs approximately 36-38 weeks after fertilization.

Gametogenesis

Gametogenesis refers to the process of formation of gametes in the primary sex organs. Gametogenesis in humans includes spermatogenesis in males and oogenesis in females.

Female Hormones

In females, the ovaries and adrenal glands form the main producers of sex hormones. Female sex hormones include estrogen, progesterone, and a small amount of testosterone.

Estrogen: This female hormone plays a significant role in reproductive and sexual development, which begins when a person reaches puberty.
Progesterone: This hormone helps stabilize menstrual cycles and prepares the body for pregnancy. Having a low level of progesterone can lead to irregular periods.
Testosterone: It is present in lower amounts in females. In females, testosterone affects: fertility, sexual desire, menstruation, tissue and bone mass, red blood cell production.

Also Read:

Related Articles
Fertilization	Follicle Stimulating Hormone	Amniocentasis
Oogenesis	Gametogenesis	Difference between Spermatogenesis and Oogenesis
Human Reproduction MCQs	Testis	Estrogen and Progesterone

Check-Out:

PCMB Study Guides
NCERT Solutions for Class 12 Physics	Class 12 Physics Notes	Formulas in Physics
Topics for Comparison in Physics	Choice-based questions in physics	Topics in relation to physics
Physics Study Notes	Class 12 Physics Book PDF	Class 12 Physics Practicals
Important Derivations in Physics	SI units in Physics	Important Physics Constants and Units
Class 12 Physics Syllabus	Mendeleev's Periodic Table	NCERT Solutions for Class 12 Biology
NCERT Solutions for Class 12 English	NCERT Solutions for Class 11 Chemistry	Class 12 Chemistry Practicals
Class 12 Chemistry Notes	Important Chemical Reactions	Class 12 Maths Notes
Class 12 PCMB Notes	NCERT Class 12 Biology Book	NCERT Class 12 Maths Book
NCERT Class 12 Textbooks	NCERT Solutions for Class 11 Maths	NCERT Solutions for Class 11 Physics
NCERT Solutions for Class 12 Maths	NCERT Solutions for Class 11 Biology	NCERT Solutions for Class 11 English
NCERT Class 11 Chemistry Book	NCERT Class 11 Physics Book	NCERT Class 11 Biology Book
Class 11 Notes	Important Maths Formulas	Important Chemistry Formulas
Class 11 PCMB Syllabus	Chemistry Study Notes	Biology Study Notes
Periodic Table in Chemistry	Important Chemical Reactions	Comparison topics in Chemistry
Comparison Topics in Maths	Biology MCQs	Important Named Reactions
Maths MCQs	Comparison Topics in Biology	Chemistry MCQs

CBSE CLASS XII Related Questions

1.
Arrange the following hormones in sequence of their secretion in a pregnant woman : hCG; LH; FSH; Relaxin.

View Solution

2.
Mention the source and the role of the following in providing defence against infection in the human body : (I) Histamine (II) Interferons

View Solution

3.
Differentiate between active and passive immunity. Write any three differences.

View Solution

4.
(I) Write the scientific names of the two species of filarial worms causing filariasis.
(II) How do they affect the body of infected persons ?
(III) How does the disease spread ?

View Solution

5.
Work out separate monohybrid crosses up to $F_2$ generation between two pea plants and two Antirrhinum plants, both having contrasting traits with respect to the colour of the flower. Comment on the patterns of inheritance in the crosses carried out in such two cases.

View Solution

6.
We know that plasmids and bacteriophages are the most commonly used vectors in biotechnology experiments. If we can link an alien piece of DNA to the plasmid DNA, the alien DNA can be multiplied equal to the copy number of the plasmid. Engineered vectors are used these days. Study the diagram of the E. coli cloning vector pBR322 and answer the questions that follow :

NCERT Solutions For Class 12 Biology Chapter 3: Human Reproduction

NCERT Solutions for Class 12 Biology 3

Class 12 Biology Chapter 3 Human Reproduction: Important Topics

Male and Female Reproductive Systems

Implantation

Parturition

Gametogenesis

Female Hormones

CBSE CLASS XII Related Questions

1.
Arrange the following hormones in sequence of their secretion in a pregnant woman : hCG; LH; FSH; Relaxin.

2.
Mention the source and the role of the following in providing defence against infection in the human body : (I) Histamine (II) Interferons

3.
Differentiate between active and passive immunity. Write any three differences.

4.
(I) Write the scientific names of the two species of filarial worms causing filariasis.
(II) How do they affect the body of infected persons ?
(III) How does the disease spread ?

5.
Work out separate monohybrid crosses up to $F_2$ generation between two pea plants and two Antirrhinum plants, both having contrasting traits with respect to the colour of the flower. Comment on the patterns of inheritance in the crosses carried out in such two cases.

Similar Biology Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

NCERT Solutions For Class 12 Biology Chapter 3: Human Reproduction

NCERT Solutions for Class 12 Biology 3

Class 12 Biology Chapter 3 Human Reproduction: Important Topics

Male and Female Reproductive Systems

Implantation

Parturition

Gametogenesis

Female Hormones

CBSE CLASS XII Related Questions

1.Arrange the following hormones in sequence of their secretion in a pregnant woman : hCG; LH; FSH; Relaxin.

2.Mention the source and the role of the following in providing defence against infection in the human body : (I) Histamine (II) Interferons

3.Differentiate between active and passive immunity. Write any three differences.

4.(I) Write the scientific names of the two species of filarial worms causing filariasis. (II) How do they affect the body of infected persons ? (III) How does the disease spread ?

5.Work out separate monohybrid crosses up to $F_2$ generation between two pea plants and two Antirrhinum plants, both having contrasting traits with respect to the colour of the flower. Comment on the patterns of inheritance in the crosses carried out in such two cases.

Similar Biology Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Arrange the following hormones in sequence of their secretion in a pregnant woman : hCG; LH; FSH; Relaxin.

2.
Mention the source and the role of the following in providing defence against infection in the human body : (I) Histamine (II) Interferons

3.
Differentiate between active and passive immunity. Write any three differences.

4.
(I) Write the scientific names of the two species of filarial worms causing filariasis.
(II) How do they affect the body of infected persons ?
(III) How does the disease spread ?

5.
Work out separate monohybrid crosses up to $F_2$ generation between two pea plants and two Antirrhinum plants, both having contrasting traits with respect to the colour of the flower. Comment on the patterns of inheritance in the crosses carried out in such two cases.