Question: 167: How many secondary spermatocytes are required to form 400 million spermatozoa?
(1) 50 million
(2) 100 million
(3) 200 million
(4) 400 million
Answer: Option (3)
Explanation:
In spermatogenesis, each secondary spermatocyte undergoes meiosis II to produce two spermatids.
Each spermatid further differentiates into one spermatozoon.
Therefore, one secondary spermatocyte produces two spermatozoa.
To form 400 million spermatozoa, the number of secondary spermatocytes required is calculated as:
\text{Number of secondary spermatocytes} = \frac{400 \text{ million}}{2} = 200 \text{ million}Hence, 200 million secondary spermatocytes are required to form 400 million spermatozoa.