Assertion (A): In human males, 50 percent of sperms carry the X chromosome while the other 50 percent carry the Y.
Reason (R): Human males have XY sex chromosomes.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Â Sex Determination in Humans |
 83%
From NCERT
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Assertion (A): Spermiation takes place in epididymis.
Reason (R): Sertoli cells remain attached to spermatozoa in epididymis.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Sertoli cells remain attached to spermatozoa in epididymis.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
 70%
From NCERT
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Assertion (A): Parturition is induced by a complex neuroendocrine mechanism.
Reason (R): The signals for parturition originate from fully developed fetus and placenta
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): The signals for parturition originate from fully developed fetus and placenta
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Fetal Development & Parturition |
 55%
From NCERT
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Assertion (A): Placenta act as endocrine gland
Reason (R): It secretes steroidal hormones to maintain structure of corpus luteum.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): It secretes steroidal hormones to maintain structure of corpus luteum.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Implantation |
From NCERT
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Assertion (A): Ovulation occurs due to LH surge.
Reason (R): LH surge induces completion of meiosis I in primary oocyte.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): LH surge induces completion of meiosis I in primary oocyte.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â oogenesis |
 60%
From NCERT
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Assertion (A): Seminal plasma lacks spermatozoa.
Reason (R): Seminal plasma contains secretions of seminal vesicles only.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Seminal plasma contains secretions of seminal vesicles only.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Male Reproductive System |
From NCERT
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Assertion (A): The spermatids are transformed into spermatozoa by the process called spermiation.
Reason (R): After spermiation, sperm heads become embedded in the Sertoli cells.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): After spermiation, sperm heads become embedded in the Sertoli cells.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
 65%
From NCERT
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Assertion (A): In the absence of fertilization corpus luteum degenerates in 7 to 10 days
Reason (R): Degeneration of corpus luteum is due to non availability of FSH from anterior pituitary.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Degeneration of corpus luteum is due to non availability of FSH from anterior pituitary.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Menstrual Cycle: Luteal Phase |
 53%
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Spermatogenesis starts at the age of puberty due to a significant increase in the secretion of:
1. GnRH
2. FSH
3. LH
4. Testosterone
1. GnRH
2. FSH
3. LH
4. Testosterone
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
 76%
From NCERT
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The primary follicles in the ovary grow to become a fully mature Graafian follicle and simultaneously the endometrium of the uterus regenerates through proliferation during the:
| 1. | menstrual phase of the menstrual cycle |
| 2. | follicular phase of the menstrual cycle |
| 3. | ovulatory phase of the menstrual cycle |
| 4. | luteal phase of the menstrual cycle |
Subtopic: Â Menstrual Cycle: Pre Ovulatory Phase |
 83%
From NCERT
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