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.

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 C Assertion is correct but Reason is incorrect.
Assertion is correct as old age is not an illness. Old age is the result of ageing or senescence which is the progressive deterioration in the structure and functioning of cells, tissues and organs. Here the body's immune system loses its ability to effectively deal with the antigens. This reduces the resistances as well as the adaptation of the body.
Reason is incorrect as cessation of mitosis is not as such as genetically programmed event. During ageing, there is a decrease in multiplication of cells, though it differs in various tissues.
Therefore, the correct answer is option C.

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Similar questions

Q. 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.

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: 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.

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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