Question:

Given below is the schematic representation of spermatogenesis in human males:

schematic representation of spermatogenesis in human males

Choose the option that shows the correct labelling of ‘I’, ‘II’, ‘III’ and ‘IV’ in the given diagram.

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In spermatogenesis, the sequence of cell divisions is: Spermatogonia \( \to \) Primary Spermatocytes \( \to \) Secondary Spermatocytes \( \to \) Spermatids \( \to \) Spermatozoa.
Updated On: May 26, 2025
  • spermatozoa, spermatid, sec. spermatocyte, spermatogonia
  • spermatid, spermatogonia, sec. spermatocyte, spermatozoa
  • spermatogonia, sec. spermatocyte, spermatozoa, spermatid
  • spermatogonia, sec. spermatocyte, spermatid, spermatozoa
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The Correct Option is D

Solution and Explanation

Spermatogenesis and Labelling of Stages 

Step 1: Understanding the Process of Spermatogenesis

Spermatogenesis is the process of sperm cell development in males, occurring in the seminiferous tubules of the testes. The key stages are:

  • Spermatogonia: The primordial germ cells that divide by mitosis to form primary spermatocytes.
  • Primary Spermatocytes: These undergo meiosis to form secondary spermatocytes.
  • Secondary Spermatocytes: These undergo a second meiotic division to form spermatids.
  • Spermatids: These undergo maturation (spermiogenesis) to become spermatozoa (mature, motile sperm cells).

Step 2: Analyzing the Diagram

The diagram below represents the stages of spermatogenesis. Based on the description:

  • I represents spermatogonia, the undifferentiated germ cells that divide to produce primary spermatocytes.
  • II represents secondary spermatocytes, which are produced after the first meiotic division of primary spermatocytes.
  • III represents spermatids, which are formed after the second meiotic division of secondary spermatocytes.
  • IV represents spermatozoa, the fully mature sperm cells after spermiogenesis.

Step 3: Conclusion

The correct labelling of 'I', 'II', 'III', and 'IV' in the diagram is: Option (D): Spermatogonia, Secondary Spermatocyte, Spermatid, Spermatozoa.

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