At the time of implantation, the human embryo is called:

embryo

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blastocyst

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zygote

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foetus

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Solution

The correct option is B
blastocyst

The embryo with about 64 cells is termed as ' blastocyst'. The process of attachment of blastocyst with the uterine wall of the mother is called implantation. It occurs after 7 days of fertilisation.

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