Q.

Assertion: Male is responsible for the sex determination in humans.
Reason: It has similar kind of chromosomes XX.

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)

Male is responsible for the sex determination in humans because it has different kinds of chromosomes namely XY. A child which inherits X chromosome from his father will be a girl and the one who inherits Y chromosome will be a boy. Thus, assertion is true but reason is false.