Menstruation — task. Science CBSE Homework Assignments, Class 10.

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

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

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

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1. Menstruation