BIOLOGY [1 Mark Question Answer]

One characteristic feature of alluvial soil is that it is loamy in texture with lots of humus and hence very fertile.

Loamy soil is best for plant growth as it contains a lot of humus and holds sufficient water and air between soil particles.

Bedrock is a layer of unweathered parent rock below the soil which provides a base to the three horizons of soil profile.

PQ. Crop rotation: Crop rotation is the practice of growing different kinds of crops on the same land each season to maintain the fertility of the soil and control weeds, pests etc.

PQ. Soil profile : Soil profile is a vertical section of soil from the surface of the earth down to the bedrock, showing different horizons.

Afforestation : The process of planting more trees in the environment is called afforestation. It helps to prevent soil erosion, global warming, heavy storms and forceful floods.

Soil conservation: Soil conservation means prevention of loss of top fertile soil due to erosion and preservation of top soil.

The loss of the fertile top soil by the action of water or wind is called soil erosion.

Weathering : The breaking down of huge pieces of rocks into fine particles through direct contact with atmospheric conditions like wind, water, temperature changes etc. is called weathering. It leads to formation of soil over a long period of time.