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Q.99) Consider the following :

A. The reductive division for the human female gametogenesis starts earlier than that of the male gametogenesis.

B. The gap between the first meiotic division and the second meiotic division is much shorter for males compared to females.

C. The first polar body is associated with the formation of the primary oocyte.

D. Luteinizing Hormone (LH) surge leads to disintegration of the endometrium and onset of menstrual bleeding.

 

A) B and C are true

 

 

B) A and B are true

 

 

C)  

A and C are true

 

 

D) B and D are true

 

 

Answers (1)

best_answer
  • Statement A is true: In females, meiosis begins during fetal life, and primary oocytes are formed before birth. In contrast, male gametogenesis (spermatogenesis) begins at puberty.
  • Statement B is true: In males, the two meiotic divisions follow each other rapidly. In females, after meiosis I is completed at puberty, meiosis II gets arrested in metaphase and is completed only after fertilisation, causing a long gap.
  • Statement C is false: The first polar body is formed after the completion of the first meiotic division, not during the formation of the primary oocyte.
  • Statement D is false: LH surge causes ovulation, not menstrual bleeding. Menstrual bleeding is due to the breakdown of the endometrium in the absence of fertilisation and a drop in progesterone levels.

Hence, the correct answer is Option (2).

 

Posted by

Parbin Huda Baruah

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