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(A) The $Placenta$ is a specialized disc-shaped organ that develops during pregnancy. It acts as the structural and functional unit between the develo

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Placenta

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(A) The $Placenta$ is a specialized disc-shaped organ that develops during pregnancy. It acts as the structural and functional unit between the developing embryo (foetus) and the maternal body. It facilitates the supply of oxygen and nutrients to the embryo and also helps in the removal of carbon dioxide and waste materials produced by the embryo. It is connected to the foetus through the umbilical cord.

Column $I$	Column $II$
$(a)$ Third week	$(1)$ Development of pre-umbilical cord
$(b)$ Third month	$(2)$ Body develops but head remains big
$(c)$ Fourth week	$(3)$ Embryonic slit widens
$(d)$ Fourth month	$(4)$ Muscles activate

It is the structural and functional unit between the developing embryo (foetus) and the maternal body.

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Match the columns:

Column $I$ Column $II$

$(a)$ Third week $(1)$ Development of pre-umbilical cord

$(b)$ Third month $(2)$ Body develops but head remains big

$(c)$ Fourth week $(3)$ Embryonic slit widens

$(d)$ Fourth month $(4)$ Muscles activate

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