Assertion :In tropical rain forests, O horizon and A horizon of soil profile are shallow and nutrient-poor. Reason: Excessive growth of micro-organisms in the 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 C Assertion is correct but Reason is incorrect.
In forests, the O layer or horizon is the litter layer. The layer comprises of fallen leaves. The second layer is the A horizon. The organic matter in this layer is converetd to humus. The humus leaches into the deeper layer called B horizon. The O and A horizons are shallow in the forests. So, assertion is correct.
The reason is incorrect because the crop utilizes the nutrients during its life cycle. For the increase in the nutrients and fertility of the soil, the soil is stimulated with microorganisms. The microorganisms help in breaking of the organic matter and providing nutrients for the plant growth.
Therefore, the correct answer is option C.

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Similar questions

Q. Assertion :In tropical rain forests, O-horizon and A-horizon of soil profile are shallow and nutrient-poor. Reason: Excessive growth of micro-organisms in the soil depletes its organic content.

Q. 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

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.

(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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