Multiple Choice Question Answer XXXX — task. Science CBSE, Class 10.

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1. Twins absolutely resembling each other in sex and external appearance result when ___________.

Two halves of the same egg are fertilised by two separate sperms
Two similar sperms fertilise two similar eggs
Same sperm fertilises two eggs
Two halves of the same egg develop separately after it is fertilised by one sperm

2. Copulation in human beings may result in fertilisation during (normal menstrual cycle is for 28 days)

21th day and 28th day
4th day and 10th day
11th day and 21st day
any day between 1st day and 28th day

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