pedology or soil & agriculture section 3 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Answer: (d)

Some of the indirect uses of forests include prevention and control of soil erosion, flood control, checks on the spread of deserts, an increase of soil fertility, and the effect on climate.

Forests play a significant role in the prevention and control of soil erosion by water and wind. The destruction of forest cover leads to increased runoff of rainwater and its diminished seepage in soil.

Answer: (d)

Soil erosion takes place when the soil is blown away by the wind or washed away by the rain. Afforestation or planting trees can check soil erosion as roots of trees/plants hold the soil.

Thus, when more trees are planted their roots don’t allow the soil to be blown or washed away and prevent soil erosion.

Answer: (a)

Answer: (a)

Answer: (a)

The organic matter present in soil is known collectively as humus. Humus is fully decomposed and finely divided organic matter. Dune is a hill or ridge of sand accumulated and sorted by wind action.