Identify True/False statements. Correct each false statement to make it true.
- Androgens are produced by Sertoli cells. (True/False)
- Spermatozoa get nutrition from Sertoli cells. (True/False)
- Leydig cells are found in ovary. (True/False)
- Leydig cells synthesise androgens. (True/False)
- Oogenesis takes place in corpus luteum. (True/False)
- Menstrual cycle ceases during pregnancy. (True/False)
- Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/False)
- Androgens are produced by Sertoli cells. (True/False)
- Spermatozoa get nutrition from Sertoli cells. (True/False)
- Leydig cells are found in ovary. (True/False)
- Leydig cells synthesise androgens. (True/False)
- Oogenesis takes place in corpus luteum. (True/False)
- Menstrual cycle ceases during pregnancy. (True/False)
- Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/False)
Solution and Explanation
- Androgens are produced by Sertoli cells. (False)
Androgens are produced by Leydig cells found in seminiferous tubules of the testis. - Spermatozoa get nutrition from Sertoli cells. (True)
- Leydig cells are found in ovary. (False)
Leydig cells are found in the seminiferous tubules of the testis. - Leydig cells synthesise androgens. (True)
- Oogenesis takes place in corpus luteum. (False) Oogenesis takes place in the ovary.
- Menstrual cycle ceases during pregnancy. (True)
- Presence or absence of the hymen is not a reliable indicator of virginity or sexual experience. (True)
Top Questions on Human Reproduction
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?- CBSE CLASS XII - 2025
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- Shyam and Radha are expecting their first child with Radha being in her second month of pregnancy with no complications. Shyam’s family has a history of cystic fibrosis while Radha’s family has a history of Down’s syndrome, leading to a concern that the baby may have one of these conditions.
(a) Suggest and explain a way of testing if their baby is at risk for any genetic disorders.
(b) In case of presence of one or both of the abnormalities and posing a risk to the mother’s health, mention one possible option for them to consider. Is that option safe for Radha at the current gestational age? Justify.
(c) Under what conditions is the process mentioned in (b) illegal?- CBSE CLASS XII - 2025
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- Assertion (A): Saheli is the World’s first non-steroidal oral contraceptive pill.
Reason (R): It has been developed by National Institute of Immunology, New Delhi.- CBSE CLASS XII - 2025
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Match the following items of Column-I with that of Column-II:
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- "Sex of a newborn baby in humans depends on the father, not the mother." Confirm this statement with the help of a flow chart.
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Concepts Used:
Menstrual cycle
Menstrual cycle is the monthly series of changes a woman's body goes through while having a possibility of pregnancy. Each month one egg is released by the and this process is called ovulation. If ovulation takes place and the egg isn't fertilized, the lining of the uterus sheds through the vagina. This is a menstrual period.
Menstrual cycle irregularities can have many different causes, including:
- Pregnancy or breast-feeding.
- Eating disorders, extreme weight loss or excessive exercising.
- Polycystic ovary syndrome (PCOS)
- Premature ovarian failure
- Pelvic inflammatory disease (PID)
- Uterine fibroids