Assertion :Yolk sac has no nutritive role Reason: Yolk is absent in yolk sac of mammals

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

A and R are true and R is not the correct explanation of A

No worries! We‘ve got your back. Try BYJU‘S free classes today!

A is true, R is false

No worries! We‘ve got your back. Try BYJU‘S free classes today!

A is false, R is true

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D A is false, R is true
The most important role of yolk sac is to provide nourishment to the developing embryo during the early stages of development. It provides nutrients from the mother to the embryo before the placenta is formed. Hence, the given assertion is false. Yolk is absent in the yolk sac of mammals. In mammals, yolk sac is small in size as compared to that of birds and reptiles. Hence, reason is correct.
Thus, the correct answer is 'A is false, R is true.'

Suggest Corrections

Similar questions

Q. Assertion: Ray

\underset{A B}{\to}

has one end-point A.
Reason: Line segment

A B

has two end-points A and B.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. (i)
Assertion: A circle is not a rectilinear figure.
Reason: A figure formed by straight lines only is called a rectilinear figure.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. Assertion: A cyclic parallelogram is a square.
Reason: Diameter is the largest chord in a circle.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. Assertion: Every parallelogram is a rectangle.
Reason: The angle bisectors of a parallelogram form a rectangle.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Assertion: If $a \neq b$ , then $(a, b) \neq (b, a)$ .
Reason: $(4, - 3)$ lies in Quadrant $I V$
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Join BYJU'S Learning Program