Science MCQ (1 Marks)

Time determines the thickness of soil profile as many layers of sand, weathered rock, humus gets deposited over the already present soil layer.

Minerals, organic matter, air and water.

Black Soil covers the Deccan plateau along the Godavari and Krishna valleys. This soil is rich in calcium carbonate, potash, magnesium, and lime making it ideal for growing cotton.

Water holding capacity.

Clayey soil

Humus is an organic component of soil formed by the decomposition of leaves and other plant material or rotting dead matter by soil microorganisms.

Soil contains rock, organic matter such as humus, air, and water. All these are necessary forms in the soil for life to exist.

Sub soil

Ammonium sulfate

Formation of soil is called pedogenesis. Soil formation is the process of soil formation from its parental material. In addition to the soil parent material, soil formation is also dependent upon other prevailing processes like climate, relief, etc.

Mesophiles

All of the above

Weathering

Reduction

Subsoil.

The uppermost horizon is generally dark in colour as it is rich in humus and minerals.

Alluvial soil

Transported soil

All of the above

Land

Heterotrophs

Percolation rate of water is different in different types of soil. It is highest in sandy soil and least in clayey soil.

Porosity.

Loamy Soil.

Vegetation.

Deserts and barren land have fewer plantations. As a result, the soil in those regions becomes loose and is easily eroded by wind. Thus soil erosion is more severe in deserts and bare land.

Slow process.

Nitrobactor

Soil erosion.

Soil gives crop

Thick.

Silt.

Vertisol

Sandy Soil.

Kaolinite

The uppermost layer that is topsoil is dark because it is rich in humus and minerals.

Clayey soil.

Rivers of north India, which flow from the Himalayas, bring a variety of materials including silt, clay, sand, and gravel. They deposit their materials called alluvial soil, in the planes of north India. This soil is very fertile and supports nearly half the population of India.

Sandy soil.

Laterite has been derived from the Latin word ‘later’ which means brick. The laterite soil develops in areas with high temperature and heavy rainfall. These soils are mainly found in Karnataka, Kerala, Tamil Nadu, Madhya Pradesh, and the hilly areas of Orissa and Assam. This soil is very useful for growing tea and coffee.

Weathering

Humin