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.

Step-by-step solution

The head size is increasing (especially the frontal brain) hence growth rate needs to increase 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 increase in brain/ skull size would required increase in gestation period, hence both assertion and reason are false.