AIIMS 2004
- Exam
- AIIMS
- Year
- 2004
- Subject
- Zoology
- Chapter
- Locomotion and Movement
AIIMS 2004 · Zoology · Locomotion and Movement
Assertion : From evolutionary point of view, human gestation period...
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
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
D. If both assertion and reason are false.
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.