Question:
Identify the INCORRECT statement about zona pellucida.
Identify the INCORRECT statement about zona pellucida.
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The acrosome releases hyaluronidase and acrosin, not trypsin and pepsin.
Updated On: Nov 12, 2026
- It has fertilizin receptor proteins (ZP 3, ZP 2)
- The fertilizin binds to specific protein- antifertilizin of sperm.
- It brings about attraction of sperms to the egg to enhance fertilization.
- It stimulates acrosome to release Trypsin and Pepsin
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
The zona pellucida surrounds the egg and has fertilizin with receptor proteins ZP3 and ZP2.
Step 2: True statements
Fertilizin binds the sperm protein antifertilizin, and this attracts sperms to the egg.
Step 3: The wrong statement
Binding triggers the acrosome reaction, but the acrosome releases sperm lysins: hyaluronidase, corona-penetrating enzyme and acrosin. Trypsin and pepsin are digestive enzymes, not sperm lysins.
Step 4: Conclusion
The statement about release of trypsin and pepsin is incorrect.
Final Answer:
The incorrect statement is that the zona stimulates the acrosome to release trypsin and pepsin. \[ \boxed{\text{(D) }\text{It stimulates acrosome to release Trypsin and Pepsin}} \]
The zona pellucida surrounds the egg and has fertilizin with receptor proteins ZP3 and ZP2.
Step 2: True statements
Fertilizin binds the sperm protein antifertilizin, and this attracts sperms to the egg.
Step 3: The wrong statement
Binding triggers the acrosome reaction, but the acrosome releases sperm lysins: hyaluronidase, corona-penetrating enzyme and acrosin. Trypsin and pepsin are digestive enzymes, not sperm lysins.
Step 4: Conclusion
The statement about release of trypsin and pepsin is incorrect.
Final Answer:
The incorrect statement is that the zona stimulates the acrosome to release trypsin and pepsin. \[ \boxed{\text{(D) }\text{It stimulates acrosome to release Trypsin and Pepsin}} \]
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