alleryThe attachment of the blastocyst to the uterine wall (endometrium), occurring about 6 to 7 days after fertilization, is called:
ACleavage
BImplantation
CGastrulation
DParturition
Answer & Solution
Correct answer: B. Implantation
1. After cleavage the zygote becomes a blastocyst.
2. The blastocyst reaches the uterus and attaches to the endometrium.
3. This attachment, about 6 to 7 days after fertilization, is called implantation.
4. Cleavage is the earlier cell divisions, gastrulation forms germ layers afterwards, and parturition is childbirth, so they are ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 17 Reproduction in Plants and Animals "Implantation", p.259_
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