Q.

Assertion: High chances of fertilisation is during the mid of the menstrual cycle.
Reason: Sperms are very active during that time

1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true but Reason is false.  
4 Assertion is false but Reason is true.  

Ans.

(3)

Ovulation takes place on the 14th day of the menstrual cycle, so if the sperm happens to meet the ovum during that phase fertilisation will take place. Thus, assertion is true but reason is false.