Question

Describe the post-zygotic event leading to implantation and placenta formation in humans. Mention any two functions of placenta.

Answer 1

Answer:

~At first zygote clevaged into 8-16 blastomere called. morula

~Then that morula continue to divide and form blastocyst then it follows blastulation i.m, moved to uterus

~Then tripoblast layer gets attached to the endometrium

~Then blastocyst becomes embedded in the endomeriun called implantation

Explanation:

FUNCTION OF PLACENTA

~It facilities the supply of oxygen and nutrition to the embryo

~ It aids in the removal of carbon dioxide and waste material produced by the foetus

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Answer 2

Answer:

hope it helps

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(i) Implantation: The embedding

of a fertilised mammalian egg (embryo) into the inner thick wall of the uterus (womb) where it will continue its development is called implantation.

(ii) Placenta: It is a complex double-layered spongy vascular tissue in human female formed by the joint activity of maternal and foetal tissues in the wall of uterus that is meant for attachment, nourishment and waste disposal for the foetus.

(b) The average duration of human pregnancy is 40 weeks or 280 days.

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