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NEET 2021 · BiologyPrevious Year Question

Receptors for sperm binding in mammals are present on

Answer: (B) Zona pellucida. Answer: (B) Zona pellucida Solution: During fertilisation a sperm first comes in contact with the zona pellucida layer of the ovum, which carries the sperm-binding receptors and triggers membrane changes blocking polyspermy.

  1. A.Perivitelline space
  2. B.Zona pellucida✓
  3. C.Corona radiata
  4. D.Vitelline membrane

Correct Answer

(B) Zona pellucida

Solution & Explanation

Answer: (B) Zona pellucida Solution: During fertilisation a sperm first comes in contact with the zona pellucida layer of the ovum, which carries the sperm-binding receptors and triggers membrane changes blocking polyspermy. The acrosomal enzymes then help the sperm cross the zona pellucida. Hence the receptors lie on the zona pellucida, not the corona radiata, perivitelline space or vitelline (plasma) membrane. NCERT Reference: Ch 2, p.35, line 36 — "During fertilisation, a sperm comes in"

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