Assertion :Biogeochemical cycling means cycling of nutrients in an ecosystem. Reason: Decomposers play major role in biogeochemical cycling.

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.
Biogeochemical cycles are the pathways that involve the exchange of materials between biotic and abiotic components of the biosphere.
Decomposers are organisms, that break down dead or decaying organisms, and in doing so, carry out the natural process of decomposition. Like herbivores and predators, decomposers are heterotrophic. It means, that they use organic substrates to get their energy, carbon, and nutrients for growth and development.
So, the correct answer is option B.

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Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

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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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