Assertion :As favourable variations are transmitted from generation to generation, successive generations become better adapted to the environment, more over, new adaptations may arise due to changing environment. In this way, the adaptive traits preserved by natural selection, will gradually change the characteristics of a species. Reason: This explains the origin of species.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
"Survival of the fittest" was mainly used by Charles Darwin which stated that organism struggles to survive in the environment. The species which is most fit and is able to tolerate the harsh conditions is able to survive for the longer duration. This supports the fact that evolution is dependent on natural selection. As favourable variations are transmitted from generation to generation, successive generations become better adapted to the environment, more over, new adaptations may arise due to changing environment. In this way, the adaptive traits preserved by natural selection will gradually change the characteristics of a species. This clearly explains the origin of species. So, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Similar questions

Q. Given below are assertion and reason.

Point out if both are true with the reason being the correct explanation (A)

Both true but the reason is 'not correct explanation (B)

Assertion true but the reason is wrong (C)

Both are wrong (D).

Assertion.

Natural selection is the outcome of difference in survival and reproduction among individual that show variation in one or more traits.

Reason.

Adaptive forms of a given trait tend to become more common. Less adaptive ones become less or disappear.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(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.

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.

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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