Assertion :
In tropical rainforest O horizon and A horizon of soil profile are shallow and nutrient poor
Reason: Excessive growth of micro organism in soil depletes its organic content

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
A horizon comes below O horizon and it is the topmost layer of soil. In a tropical forest, the temperature is very high and humid as the rainfall rate is very high here as they are in the tropical zone. In the topmost layer, vegetation grows and various activities are carrying out continuously. The soil here is red latosols and is very thick. Leaching, as well as cycling of nutrients, occurs very rapidly. So the nutrient content is not low due to bacteria but is low due to leaching.
So the correct option is 'Assertion and Reason are true but Reason is not the correct explanation of Assertion'.

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