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Human Reproduction — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Reproduction1 Mark
Question
For two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
  1. Both assertion and reason are true, and reason is the correct explanation of assertion.
  2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
  3. Assertion is true, but reason is false.
  4. Both assertion and reason are false.
Assertion: Head of sperm consists of acrosome and mitochondria.
Reason: Acrosome contains spiral row of mitochondria.
✓

Answer

  1. Both assertion and reason are false.

​​​​​​​​​​​​​​​​​​​​​​​​​​​​Explanation:

Sperm is a microscopic thread like motile cell which is distinguishable into head, middle piece and tail. Head is the enlarged end of sperm which contain 2 components - nucleus capped by acrosome. Acrosome contains sperm lysins (hyaluronidase enzyme) and nucleus is a compact mass of DNA having some prolamines. Middle piece is the mitochondrial portion. In between the head and middle piece there is a small constricted neck part containing two centrioles. Tail is narrow vibratile long part with two regions - main and end piece.

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