Assertion :The duck-billed platypus and the spiny ant-eater, both are egg-laying animals yet they are grouped under mammals. Reason: Both of them have seven cervical vertebrae and 12 pairs of cranial nerves.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The duck-billed platypus and the spiny anteater, both are egg-laying animals yet they are grouped under mammals. Both of them have seven cervical vertebrae and 12 pairs of cranial nerves but it is not distinguishing feature of mammals. They are mammals because of their constant body temperature regulation (homeothermy) and presence of diaphragm.
Therefore, the correct answer is option B.

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Similar questions

Q. Assertion :The duck billed Platypus and the spiny ant eater, both are egg laying animals yet they are grouped under mammals. Reason: Both of them have seven cervical vertebrae and 12 pairs of cranial nerves.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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