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NEETZoologyHuman Reproduction

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms. Reason (R): The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the p

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is NOT the correct explanation of Assertion (A)
  3. CAssertion (A) is true but Reason (R) is false
  4. DAssertion (A) is false but Reason (R) is true

Correct answer

B. Both Assertion (A) and Reason (R) are true but Reason (R) is NOT the correct explanation of Assertion (A)

Step-by-step solution

Both Assertion (A) and Reason (R) are correct statements based on NCERT. During fertilisation, a sperm contacts the zona pellucida and induces membrane changes to prevent polyspermy, ensuring only one sperm fertilises the ovum. This makes the Assertion true. The acrosomal secretions contain enzymes that help the sperm penetrate the zona pellucida and plasma membrane to enter the ovum's cytoplasm. This makes the Reason true. However, the mechanism of sperm entry described in the Reason is not the explanation for why

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