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Question

Which of the following does not occur during implantation?


A
The embryo secretes enzymes that digest away part of the endometrium.
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B
The embryo is drawn into the placenta and becomes surrounded by it.
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C
The embryo forms finger-like projections that burrow into the uterine wall.
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D
The embryo develops a hollow ball around it with a fluid-filled interior.
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Solution

The correct option is A The embryo secretes enzymes that digest away part of the endometrium.
Implantation is the process of attachment of developing embryo in form of blastocyst into the uterine wall. The balstocyst forms a pit in the endometrial lining and gets attached to it and the lining then covers the zygote, which then leads to formation of placenta and other embryonic layers.
So, the correct option is 'The embryo secretes enzymes that digest away part of the endometrium'.

Biology

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