- Exam
- NEET
- Year
- 2023
- Subject
- Zoology
- Chapter
- Human Reproduction
NEET 2023 · Zoology · Human Reproduction
Given below are statements: one is labelled as Assertion A and the...
Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Endometrium is necessary for implantation of blastocyst.
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:
Options
- AA is false but R is true
- BBoth A and R are true and R is the correct explanation of A
- CBoth A and R are true and R is the NOT the correct explanation of A
- DA is true but R is false
Correct answer
C. Both A and R are true and R is the NOT the correct explanation of A
Step-by-step solution
Implantation is the process in which the blastocyst gets embedded in the endometrium of the uterus. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of cells attached to trophoblast called the inner cell mass. The trophoblast layer then gets attached to the endometrium and the inner cell mass gets differentiated as the embryo.
In the absence of fertilisation, the corpus luteum degenerates. This causes disintegration of the endometrium leading to menstruation, marking a new cycle.