Given below are two statements: one is labelled as Assertion 
and the other is labelled as Reason R.
Assertion
Reason (R): In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium. In the light of the above statements, choose the correct answer from the options given below;
is false but 
is true.
and 
are true and 
is the correct explanation of 
.
and 
are true but 
is NOT the correct explanation of 
.
is false.
Text Solution
Verified by ExpertsNOT AVAILABLE
Both assertion and reason are correct but reason is not correct explanation why endometrium
is necessary for implantation of blastocyst. The attachment of a blastocyst to the endometrium is called the implantation. It occurs about 6 days after fertilisation. The endometrium is necessary for implantation as it serves as a key place not only for supporting foetal growth through supplementation of oxygen and nutrients but also for protecting the embryo and later the foetus from microbial invasion during pregnancy. If fertilisation does not occur, the levels of progesterone and estrogens decline due to degeneration of the corpus luteum. Withdrawal of progesterone and estrogens causes disintegration of the endometrium leading to menstruation.
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