Question

in human female the blastocyst:-​

Answer 1

Answer:

B is correct

Explanation:

Option 1 is wrong because implantation occurs in 4th week of pregnancy.

3 wrong because before implantation trophoblast layer gives rise to extra embryonic membranes except chorion.

4 is also wrong because it's not possible to form placenta before implantation.

Answer 2

ANSWER:-

Option 3 is correct!

→ The trophoblast cell mass gets attached to the endometrium and the inner cell mass gets differentiated as the embryo.

✓ gets implantation in endometrium by trophoblast cell

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