Multiple choice

Formation of fertilization membrane is a sort of defence reaction, primarily meant to

  1. prevent entrance of more than one sperm

  2. activate the egg to make it to undergo change

  3. bring change in the composition of cytoplasm

  4. induce physiological changes
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A Correct answer
Explanation

The formation of the fertilization membrane (cortical reaction) is a defense mechanism that prevents polyspermy, ensuring that only one sperm fertilizes the egg.

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