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Q. No.In spite of an adequate number of sperms present in the semen of a healthy male, he may be infertile because:
| I: | Only 90% of the sperms are morphologically normal. |
| II: | Only 30% of the sperms show vigorous motility |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
 56%
From NCERT
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In males, the Follicle Stimulating Hormone:
| I: | stimulates primary spermatocytes to undergo the first division of meiosis, to form secondary spermatocytes. |
| II: | enhances the production of androgen-binding protein by the Sertoli cells of the testes |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
From NCERT
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How many of the given statements are true?
| A: | Spermatogonia have 46 chromosomes and always undergo meiotic cell division |
| B: | Primary spermatocytes divide by mitotic cell division |
| C: | Secondary spermatocytes have 23 chromosomes and undergo second meiotic division |
| D: | Spermatozoa are transformed into spermatids |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for maturation and motility of sperms. |
| Statement II: | The functions of male sex accessory ducts and glands are maintained by the gonadotropins. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |Â Male Reproductive Duct System |
From NCERT
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Consider the given two statements:
| Assertion (A): | Testes in males and ovaries in females are the primary sex organs. |
| Reason (R): | The primary sex organs are those that are located within the pelvic cavity and the secondary sex organs are the external genitalia. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Introduction |Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |Â Female Reproductive System-1 |Â Female Reproductive System-2 |
 60%
From NCERT
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- 1(current)
Q. No.
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