NCERT Solutions For Class 12 Biology Chapter 3: Human Reproduction

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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.

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CBSE CLASS XII Related Questions

1.
Arrange the following in the correct sequence of their evolution and select the correct option:
(i) Seaweed
(ii) Invertebrates
(iii) Jawless fish

(i), (ii), (iii)
(i), (iii), (ii)
(ii), (iii), (i)
(ii), (i), (iii)

View Solution

2.
Assertion (A) : The milk produced by transgenic cow 'Rosie' was nutritionally more balanced product for human babies than natural cow milk.
Reason (R) : It was human protein enriched milk containing human alpha lactalbumin.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.

View Solution

3.
In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called ______.

Stratification
Layering
Fragmentation
Population

View Solution

4.
Which of the following sacred groves is found in Meghalaya?

Jaintia hills
Bastar
Chanda
Sarguja

View Solution

5.
Monascus purpureus is a yeast used commercially in the production of which one of the following?

Ethanol
Streptokinase
Citric acid
Statins

View Solution

6.
In the following figure, two ways of pairing of two homologous pairs of chromosomes are shown. Which of the following phenomena is expressed?

Linkage of genes
Independent assortment of genes
Multiple alleles
Incomplete dominance

View Solution

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 in the correct sequence of their evolution and select the correct option:
(i) Seaweed
(ii) Invertebrates
(iii) Jawless fish

2.
Assertion (A) : The milk produced by transgenic cow 'Rosie' was nutritionally more balanced product for human babies than natural cow milk.
Reason (R) : It was human protein enriched milk containing human alpha lactalbumin.

3.
In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called ______.

4.
Which of the following sacred groves is found in Meghalaya?

5.
Monascus purpureus is a yeast used commercially in the production of which one of the following?

6.
In the following figure, two ways of pairing of two homologous pairs of chromosomes are shown. Which of the following phenomena is expressed?

Similar Biology Concepts

Comments

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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 in the correct sequence of their evolution and select the correct option: (i) Seaweed (ii) Invertebrates (iii) Jawless fish

2.Assertion (A) : The milk produced by transgenic cow 'Rosie' was nutritionally more balanced product for human babies than natural cow milk. Reason (R) : It was human protein enriched milk containing human alpha lactalbumin.

3.In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called ______.

4.Which of the following sacred groves is found in Meghalaya?

5.Monascus purpureus is a yeast used commercially in the production of which one of the following?

6.In the following figure, two ways of pairing of two homologous pairs of chromosomes are shown. Which of the following phenomena is expressed?

Similar Biology Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Arrange the following in the correct sequence of their evolution and select the correct option:
(i) Seaweed
(ii) Invertebrates
(iii) Jawless fish

2.
Assertion (A) : The milk produced by transgenic cow 'Rosie' was nutritionally more balanced product for human babies than natural cow milk.
Reason (R) : It was human protein enriched milk containing human alpha lactalbumin.

3.
In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called ______.

4.
Which of the following sacred groves is found in Meghalaya?

5.
Monascus purpureus is a yeast used commercially in the production of which one of the following?

6.
In the following figure, two ways of pairing of two homologous pairs of chromosomes are shown. Which of the following phenomena is expressed?