Assertion :Many visitors to the hills suffer from skin and respiratory allergy problems. Reason: Conifer trees produce a large quantity of wind-borne pollen grains.

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.
Gymnosperm like Pinus, usually grow on the slopes of hills and form dense forests of evergreen trees. These trees produce a large quantity of wind-borne pollen grains. On inhalation, these microspores (pollens) cause various allergies, like dermatitis, asthma, allergic rhinitis, hay fever etc., in human beings.
Hence, the correct answer is option B.

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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
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Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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