Question:
Sea urchin avoids polyspermy by:
A. Fast reaction, accomplished by an electric change in the egg plasma membrane.
B. Slower reaction, caused by the exocytosis of the cortical granules.
C. Fast reaction, caused by the exocytosis of the cortical granules.
D. Slower reaction, accomplished by an electric change in the egg plasma membrane.
Sea urchin avoids polyspermy by:
A. Fast reaction, accomplished by an electric change in the egg plasma membrane.
B. Slower reaction, caused by the exocytosis of the cortical granules.
C. Fast reaction, caused by the exocytosis of the cortical granules.
D. Slower reaction, accomplished by an electric change in the egg plasma membrane.
B. Slower reaction, caused by the exocytosis of the cortical granules.
C. Fast reaction, caused by the exocytosis of the cortical granules.
D. Slower reaction, accomplished by an electric change in the egg plasma membrane.
Show Hint
Fast = Flash of electricity. Slow = Solid wall (Envelope).
Updated On: May 28, 2026
- A and B Only
- C and D Only
- A and C Only
- B and D Only
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1--3: Analysis
The fast block is an electrical depolarisation of the membrane (A). The slow block involves the cortical reaction where cortical granules release enzymes to create a fertilisation envelope (B).
Step 4: Conclusion
A and B correctly identify the fast electrical and slow chemical/mechanical blocks.
Final Answer: (A)
The fast block is an electrical depolarisation of the membrane (A). The slow block involves the cortical reaction where cortical granules release enzymes to create a fertilisation envelope (B).
Step 4: Conclusion
A and B correctly identify the fast electrical and slow chemical/mechanical blocks.
Final Answer: (A)
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