Question:
Which of the following is NOT an acrosomal reaction?
Which of the following is NOT an acrosomal reaction?
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The acrosomal reaction releases enzymes after sperm contact with the zona pellucida.
Updated On: Nov 13, 2026
Formation of cone of reception.
Production of weak wave of depolarization in egg.
Release of zona lysin.
Formation of fertilizin - antifertilizin complex.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
The acrosomal reaction occurs when the sperm meets the egg coat and releases acrosomal enzymes.
Step 2: Events included
Formation of cone of reception, release of zona lysin, and weak depolarisation of the egg belong to it.
Step 3: Not included
The fertilizin-antifertilizin complex forms earlier, during sperm-egg attraction and binding.
Final Answer:
Formation of fertilizin-antifertilizin complex is not part of the acrosomal reaction. \[ \boxed{\text{(D) }\text{Formation of fertilizin - antifertilizin complex.}} \]
The acrosomal reaction occurs when the sperm meets the egg coat and releases acrosomal enzymes.
Step 2: Events included
Formation of cone of reception, release of zona lysin, and weak depolarisation of the egg belong to it.
Step 3: Not included
The fertilizin-antifertilizin complex forms earlier, during sperm-egg attraction and binding.
Final Answer:
Formation of fertilizin-antifertilizin complex is not part of the acrosomal reaction. \[ \boxed{\text{(D) }\text{Formation of fertilizin - antifertilizin complex.}} \]
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