Assertion: From evolutionary point of view, human gestation period is believed to the shortening
Reason: One major evolutionary trend in humans has been larger head undergoing faster growth rate in the foetal stage.

Options

A. If both assertion and reason are true and reason is the correct explaination of assertion
B. If both assertion and reason are true but reason is not correct explaination of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

D

Explanation

Assertion is false as the humans would require more gestation period(Should have been 21 months as compared to 9 months and will increase).Similarly the head size is increasing (especially the frontal brain)Hence the brain growth occurs after birth till 2 years(When the arterior fontanellae close at i8 months)and some more till 30 years when finlly the cranial sutures close.Thus an increase in brain/skull size wpuld required increase in gestation period,hence both assertion and reason are false.