Assertion :Old age is not an illness but it is a continuation of life with decreasing capacity to adapt easily. Reason: Cessation of mitosis is a normal genetically programmed event.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Mitosis creates cells and its opposite apoptosis kills them but they work together to keep us healthy. Because new cells replace old, worn-out ones, our tissues remain healthy. If apoptosis is triggered when it shouldn't be, it affects the working cells which lead to old age. So, old age is not an illness. It is a continuation of life with decreasing the capacity to adapt easily. Cessation of mitosis is the ending of mitosis which is a genetically programmed event, controlled by various genes which lead to old age.
So, the correct answer is option A.

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Similar questions

Q. Assertion :Old age is not an illness. It is a continuation of life with decreasing capacity for adaptation. Reason: Cessation of mitosis is a normal genetically programmed event.

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.

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.

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