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What layer of egg cell prevents entry of other sperms?

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in Biology – Class 12 by (271k points)
What layer of egg cell prevents entry of other sperms?

(a) Corpus luteum

(b) Zona pellucida

(c) Endometrium

(d) Corona radiata

I have been asked this question in an internship interview.

This is a very interesting question from Human Reproduction topic in portion Human Reproduction of Biology – Class 12

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Correct option is (b) Zona pellucida

To elaborate: The sperm contacts the egg cell at zona pellucida. The zona pellucida then undergoes chemical changes which renders egg insusceptible to further encounters with another sperm. This is essential to ensure that only a single sperm fertilizes the egg.

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