Question:

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

Updated On: Jul 28, 2022
  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • If Assertion is true but Reason is false
  • If both Assertion and Reason are false
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The Correct Option is D

Solution and Explanation

Both Assertion and Reason are false because humans would require more gestation period (i.e. it should be $21$ months instead of $9$ months) and will increase. The frontal brain size is increasing but most of the brain growth occurs after birth till $2$ years.
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Concepts Used:

Evolution

Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.