Explain the term;(i) implantation of zygote (ii) placenta
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Zygote forms to fetus which develop into a child while placenta provides a protective layer of wall between uterus and fetus which provides nutrition respiration etc to the fetous
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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.
Explanation:
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