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.

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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.
Which one of the following options shows the correct evolutionary order of the plants mentioned below?
(i) Fern
(ii) Ginkgo
(iii) Zostrophyllum
(iv) Gnetales

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

View Solution

2.
Study the graphs given below for Case 1 and Case 2 showing different levels of certain hormones and answer the question that follows:
(a) Which hormone is responsible for the peak observed in Case 1 and Case 2? Write one function of that hormone.
(b) Write changes that take place in the ovary and uterus during follicular phase.
Student to attempt either sub-part (c) or (d):
(c) Name the hormone Q of Case 2. Write one function of hormone Q.
OR
(d) Which structure in the ovary will remain functional in Case 2? How is it formed?

View Solution

3.
1. Perform a cross between two sickle cell carriers. What ratio is obtained between carrier, disease free and diseased individuals in F1 progeny? Name the nitrogenous base substituted, in the haemoglobin molecule in this disease.
2. Explain the difference in inheritance pattern of flower colour in garden pea plant and snap-dragon plant with the help of monohybrid crosses.
OR,
Explain with the help of well-labelled diagrams how lac operon operates in E. coli :
1. In presence of an inducer.
2. In absence of an inducer.

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4.
If Meselson and Stahl's experiment is continued for 80 minutes (till III generation), what would be the ratio of DNA containing N$^{15}$/N$^{15}$ : N$^{15}$/N$^{14}$ : N$^{14}$/N$^{14}$ in the medium?

1 : 1 : 0
1 : 1 : 3
0 : 1 : 8
1 : 4 : 0

View Solution

5.
Describe the structure and working of a sparged stirred-tank bioreactor.

View Solution

6.

Study the diagram above and answer the following questions:
(a) How many alleles are involved in blood grouping?
(b) A person having 'AB' blood group has both dominant alleles. What is this inheritance type called?
(c) A man with 'A' blood group marries a woman with 'B' blood group. Can they have a child with 'O' blood group? Explain with the help of a cross.

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.
Which one of the following options shows the correct evolutionary order of the plants mentioned below?
(i) Fern
(ii) Ginkgo
(iii) Zostrophyllum
(iv) Gnetales

4.
If Meselson and Stahl's experiment is continued for 80 minutes (till III generation), what would be the ratio of DNA containing N$^{15}$/N$^{15}$ : N$^{15}$/N$^{14}$ : N$^{14}$/N$^{14}$ in the medium?

5.
Describe the structure and working of a sparged stirred-tank bioreactor.

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.Which one of the following options shows the correct evolutionary order of the plants mentioned below?(i) Fern(ii) Ginkgo(iii) Zostrophyllum(iv) Gnetales

4.If Meselson and Stahl's experiment is continued for 80 minutes (till III generation), what would be the ratio of DNA containing N$^{15}$/N$^{15}$ : N$^{15}$/N$^{14}$ : N$^{14}$/N$^{14}$ in the medium?

5.Describe the structure and working of a sparged stirred-tank bioreactor.

Similar Biology Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Which one of the following options shows the correct evolutionary order of the plants mentioned below?
(i) Fern
(ii) Ginkgo
(iii) Zostrophyllum
(iv) Gnetales

4.
If Meselson and Stahl's experiment is continued for 80 minutes (till III generation), what would be the ratio of DNA containing N$^{15}$/N$^{15}$ : N$^{15}$/N$^{14}$ : N$^{14}$/N$^{14}$ in the medium?

5.
Describe the structure and working of a sparged stirred-tank bioreactor.