Which one of the following soils is formed by capillary action?
A
Regur -black cotton soil
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B
Grey and brown soil
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C
Red and black soil
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D
Saline and alkaline
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Solution
The correct option is D Saline and alkaline
Saline and alkaline soils are also known as Usara soils. Various local names for saline soils are Reh, Kallar, and Chopan, Rakar, Thur, Karl etc. These soils have developed in areas with dry climatic conditions (in areas having a little more rainfall than the areas of desert soils) accompanied by lack of proper drainage. In this situation, salts of sodium, calcium and magnesium are deposited on the upper layer of the soil by capillary action.