Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 11 PCB Single Correct MCQ
Published on: August 12, 2026

Extrusion of second polar body from egg nucleus occurs:

A
Before entry of sperm into ovum
B
Simultaneously with first cleavage
C
After entry of sperm but before fertilization
D
After fertilization

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The correct answer is:
C

Extrusion of the second polar body from the egg nucleus occurs after entry of sperm but before fertilization.
The entry of sperm into the ovum induces completion of the meiotic division of the secondary oocyte. Entry of sperm causes breakdown of metaphase promoting factor (MPF) and turns on anaphase promoting complex (APC).

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