1.

In human female the blastocyst:-​

Answer»

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.



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