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[A] : Placenta is a tissue in eutherian ...

[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

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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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.

Connective tissues are derived from embryonic

Connective tissues are derived from embryonic

Assertion : Placenta is connected to the fetus by an umbilical cord. Reason : Fetal components of placenta are derived from endometrium.

Placenta present in mammals acts as an endocrine tissue and produces

Assertion : Placenta is combined structure of foetal tissue & maternal tissue Reason : Placenta formation is completed before 6 weeks of pregnancy .

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

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