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Question

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: When the water moving downward through a fine textured soil encounters a layer of course sand, the downward movement is temporarily increased until the soil suction in wetting front is sufficiently reduced. 

Reason R: Presence of large macrospores in the coarse sand are too large to take in water from the unsaturated microspores of the soil rapidly.

In light of the above statements, choose the most appropriate answer from the option given below

A Both A and R are correct and R is the correct explanation of A Correct Answer Incorrect Answer
B Both A and R are correct but R is NOT the correct explanation of A Correct Answer Incorrect Answer
C A is correct but R is not correct Correct Answer Incorrect Answer
D A is not correct but R is correct Correct Answer Incorrect Answer

Solution

When water moves from a fine-textured soil (e.g., clay or silt) to a layer of coarse sand, the larger pore spaces in the sand allow for faster water movement. This temporary increase in downward movement occurs until the soil suction, or the force that pulls water into the soil, is reduced enough for equilibrium to be reached. Macrospores are larger pores or channels present in coarse-textured soils, such as sand, that can quickly transport water.

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