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Solution


Q.

Extrusion of second polar body from egg occurs                        [2019, 1993]
1 simultaneously with first cleavage  
2 after entry of sperm but before fertilisation  
3 after fertilisation  
4 before entry of sperm into ovum  

Ans.

(2)

Entry of sperm into the secondary oocyte induces the completion of the meiotic division of the secondary oocyte. The second meiotic division is unequal and results in the formation of a second polar body and a haploid ovum (ootid). Soon the haploid nucleus of the sperm and that of the ovum fuse together to form a diploid zygote.