Assertion :During an ecological succession, the number of species increases, the community biomass increases and the community's ratio of respiration to photosynthesis also increases. Reason: At climax community of an ecological succession, the rate of photosynthesis of a community is almost equal to the rate of respiration.

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
Ecological Succession is caused by a change in the environment and its impact on the species and subsequent species adaptation.
The number of species, community biomass and community's ratio of respiration to photosynthesis also increases.
In changing environment and with depletion of resources, a better population of species develops.
So, the correct option is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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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.
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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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