Discussion
Assertion (A) : Laterites have low fertility.
Reason (R) : High rainfall helps in leaching out of minerals.
Which one of the following is correct ?
Answer: A
Both (A) and (R) are true and (R) is the correct explanation of (A).
Laterite soils form in hot regions with heavy rainfall and alternating wet and dry seasons. The heavy rain leaches out silica and soluble bases such as calcium, magnesium and potassium, and much of the humus, leaving a residue rich in iron and aluminium oxides. That is why laterites are poor in nutrients and need heavy manuring before they can be cropped.
So leaching under high rainfall is the very reason laterites are infertile, which makes (R) the explanation of (A) and rules out the options that call either statement false or deny the link.
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