Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
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.A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
C) If assertion is true statement but reason is false.
D) If both assertion and reason are false.
Correct Answer: C
Solution :
O horizon is the organic horizon that forms above the surface of the mineral matrix. It is mainly composed of fresh or partially decomposed organic matter while A horizon is the mineral horizon formed either at or adjacent to the surface. In tropical rain forest, O and A horizons of soil profile are shallow and nutrient poor because numerous micro-organisms occurring in them quickly break down any litter and the nutrients are recycled immediately to the plants.
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