NEET Zoology Pregnancy Assertion Reason Question
Assertion (A): Implantation is the event that leads to pregnancy. | Reason (R): The trophoblast layer of the blastocyst attaches to the endometrium, leading to its embedding into the uterine wall.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
Correct Answer
Detailed Explanation
The NCERT context explains that implantation, which involves the embedding of the blastocyst into the endometrium, is what leads to pregnancy. The trophoblast layer's attachment to the endometrium is a crucial step in this process.
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