NCERT solutions for Class 12 Biology chapter 3 - Human Reproduction

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Humans reproduce __________.

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Humans are__________.

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Male and female gametes are __________.

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Zygote is __________. (diploid/haploid)

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The process of release of the ovum from a mature follicle is called__________.

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Ovulation is induced by a hormone called the __________

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The fusion of the male and the female gametes is called __________.

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The zygote divides to form __________, which is implanted in uterus

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The structure which provides vascular connection between the fetus and uterus is called __________.

With the help of a neat, labelled diagram describe the human male reproductive system.

Draw a labeled diagram of female reproductive system.

Write two major functions each of ovary.

Describe the structure of a seminiferous tubule.

What is spermatogenesis? Briefly describe the process of spermatogenesis.

Name the hormones involved in regulation of spermatogenesis.

Define spermiogenesis

Define spermiation

Draw a labeled diagram of sperm.

What are the major components of seminal plasma?

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

What is oogenesis? Give a brief account of oogenesis.

Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.

Draw a labeled diagram of a Graafian Follicle?

Name the functions : Corpus luteum

Name the functions - Endometrium

Name the functions - Acrosome

Name the functions - Sperm tail

Name the functions - Fimbriae

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

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

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

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

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

Leydig cells are found in ovary. (True/False)

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

Leydig cells are found in ovary. (True/False)

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

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

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

Menstrual cycle ceases during pregnancy. (True/False)

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

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

What is menstrual cycle?

Which hormones regulate menstrual cycle?

What is parturition? Which hormones are involved in induction of parturition?

Women are often blamed for producing female children. Consequently, they are ill-treated and ostracised. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?

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?

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

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