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[A]: In placental mammals, the placenta ...

[A]: In placental mammals, the placenta is connected to the embryo by the umbilical cord and has an essential role in the immu- nological protection of the embryo.
[R]: In mammals foetal components of titte placenta derive initially from the chondroblast connected with embryonic blood stream ei- ther through its contact with the yolk sac

A

If both the assertion and reason are true statement and reason is correct explanation of the assertion .

B

If both the assertion and reason are true statement but reason is not a correct explanation of the assertion .

C

If the assertion is true but the reason is a false statement.

D

If both assertion and reason are false statements.

Text Solution

Verified by Experts

The correct Answer is:
C
In mammals foetal components of two placenta derive initially from the trophoblast connected with embryonic blood stream either through its contact with the yolk sac .
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Assertion : In placental mammals the placenta is connected to the embryo by the umblical cord and has an essential role in the immunological protection of the embryo . Reason : In mammals foetal components of the placenta derive initially from the chondroblast connected with embryonic derive initially from he chondroblast connected with embryonic blood stream either through its contact with the yolk sac.

[A] : Placenta is a tissue in eutherian mam- mals that has both embryonic and maternal tissue. [R]: In mammals, foetal components of the placenta derive from trophoblast.

A : placenta is connected to the embryo through an umbilical cord which helps in the transport of substance to and from the embryo R : Palcenta acts as an endocrine tissue