Question

In human reproduction, (P) spermatogenesis starts at puberty
(Q) oogenesis starts at fetal stage
(R) following meiosis, one oogonium produces 4 eggs
(S) following meiosis, one spermatogonium produces 4 sperms

• A. P, Q, R and S
• B. P, Q and S
• C. P, R and S
• D. P and S

Hint:

Spermatogenesis leads to the formation of four sperm cells, whereas oogenesis results in one egg and three polar bodies. Understanding the differences in the outcome of meiosis for males and females is crucial in human reproduction.

Answer 1

The Correct Option is B

Step 1: Understanding the statements.
- (P) spermatogenesis starts at puberty: This statement is correct. Spermatogenesis, the production of sperm, begins at puberty in males.
- (Q) oogenesis starts at fetal stage: This statement is correct. Oogenesis, the production of eggs, starts during fetal development in females.
- (R) following meiosis, one oogonium produces 4 eggs: This statement is incorrect. After meiosis in females, one oogonium produces only one viable egg and three polar bodies, not four eggs.
- (S) following meiosis, one spermatogonium produces 4 sperms: This statement is correct. After meiosis, one spermatogonium gives rise to four functional sperm cells.

Step 2: Analyzing the options.
- (A) P, Q, R and S: Statement (R) is incorrect, so this option is not correct.
- (B) P, Q and S: This option is correct, as statements (P), (Q), and (S) are correct.
- (C) P, R and S: Statement (R) is incorrect, so this option is not correct.
- (D) P and S: This option is correct, as statements (P) and (S) are both correct.

Final Answer: \[ \boxed{\text{(D) P and S.}} \]