Question

Select the correct sequence of events in human spermatogenesis:

• [(A)] Spermatid
• [(B)] Spermatogonia
• [(C)] Spermatozoa
• [(D)] Secondary Spermatocytes
• [(E)] Primary Spermatocytes

• A. (B), (E), (D), (A), (C)
• B. (E), (D), (B), (C), (A)
• C. (B), (E), (D), (C), (A)
• D. (B), (D), (E), (A), (C)

Hint:

The conversion of spermatids into spermatozoa is called spermiogenesis, while release of sperms from Sertoli cells is called spermiation.

Answer 1

The Correct Option is A

Concept: Spermatogenesis is a sequential developmental process in which primitive germ cells transform into mature spermatozoa through mitosis, meiosis, and differentiation.

Step 1: Identifying the first stage of spermatogenesis.
The process begins with spermatogonia. These are diploid germ cells present on the inner lining of seminiferous tubules. They divide repeatedly by mitosis to maintain germ cell population.

Step 2: Formation of primary spermatocytes.
Some spermatogonia enlarge and differentiate into primary spermatocytes. These cells are diploid and are prepared for meiotic division.

Step 3: Understanding Meiosis-I.
Each primary spermatocyte undergoes first meiotic division and forms two haploid secondary spermatocytes.

Step 4: Understanding Meiosis-II.
Each secondary spermatocyte undergoes second meiotic division to produce spermatids. Spermatids are haploid cells but are still non-motile and immature.

Step 5: Final maturation process.
Spermatids undergo a transformation process called spermiogenesis. During this process, they develop tail, middle piece, and acrosome to become mature spermatozoa.

Step 6: Writing the correct sequence carefully.
Therefore, the correct sequence is: \[ \text{Spermatogonia} \rightarrow \text{Primary Spermatocytes} \rightarrow \text{Secondary Spermatocytes} \rightarrow \text{Spermatids} \rightarrow \text{Spermatozoa} \] Hence, the correct option is: \[ (B), (E), (D), (A), (C) \]