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

Options

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

Answer

D

Explanation

As the humans would require more gestation period (should have been 21 months as compared to 9months and will increases). Similarly the head size is increasing (especially the frontal brain) hence growth rate needs to increases but surprisingly most of the brain growth occurs after birth till 2 years (when the anterior fontanellae close at 18 months) and some more till 30 years when finally the cranial sutures close. thus an increases in brain/skull size would require increases in gestation period.