MCQ
Onset of menstruation is due to:
- AFall in level of progesterone
- BIncrease in level of progesterone
- CIncrease in level of FSH
- DNone of these
Explanation:
The uterine lining dies due to the deficiency or reduced level of progesterone in blood and is sloughed off.
Blood vessels rupture, causing bleeding.
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$R$ : Genetic modification of organisms can have unpredictable results when such organism are introduced into the ecosystem.
Reason : Ancestral seed-eating stock of Darwin's finches radiated out from South American mainland to different geographical areas of the Galapagos Islands, where they found competitor-free new habitats.
| Column – I | Column $- II$ |
| $(1)$ Failure of cytokinesis | $(p)$ To study in beritance of particular traits |
| $(2)$ Trisomy of 21 | $(q)$ Polyploidy |
| $(3)$ Error of metabolism | $(r)$ Down's syndrome |
| $(4)$ Pedigree analysis | $(s)$ Phenylketonuria |