Chernozem or black earth variety of soil is rich in organic matter in the form of humus. It is generally a modified type of loess. True chernozem is black in color, but there are various grades, shading off into gray and chestnut-brown soils. It forms in areas that have cold winters, hot summers, and rapid evaporation of precipitation; generally only tall grass is found native on chernozem.

Correct Option: C

Chernozem or black earth variety of soil is rich in organic matter in the form of humus. It is generally a modified type of loess. True chernozem is black in color, but there are various grades, shading off into gray and chestnut-brown soils. It forms in areas that have cold winters, hot summers, and rapid evaporation of precipitation; generally only tall grass is found native on chernozem.

Cotton needs a soil with a excellent water holding capacity and aeration and good drainage as it cannot withstand excessive moisture and water logging. The major groups of soils for cotton cultivation are the alluvial soils, black soils, and red sand loam. Black cotton soils are inorganic clays of medium to high compressibility and form a major soil group in India. They are characterized by high shrinkage and swelling properties. This Black cotton soils occurs mostly in the central and western parts and covers approximately 20% of the total area of India.

Correct Option: A

Cotton needs a soil with a excellent water holding capacity and aeration and good drainage as it cannot withstand excessive moisture and water logging. The major groups of soils for cotton cultivation are the alluvial soils, black soils, and red sand loam. Black cotton soils are inorganic clays of medium to high compressibility and form a major soil group in India. They are characterized by high shrinkage and swelling properties. This Black cotton soils occurs mostly in the central and western parts and covers approximately 20% of the total area of India.

Tobacco is a crop that needs significant amounts of potassium. It is a fast growing plant, between 80 and 150 days, with a high daily potassium requirement. Potash is the common name for various mined and manufactured salts that contain potassium in water-soluble form. In some rare cases, potash can be formed with traces of organic materials such as plant remains, and this was the major historical source for it before the industrial era.

Correct Option: D

Tobacco is a crop that needs significant amounts of potassium. It is a fast growing plant, between 80 and 150 days, with a high daily potassium requirement. Potash is the common name for various mined and manufactured salts that contain potassium in water-soluble form. In some rare cases, potash can be formed with traces of organic materials such as plant remains, and this was the major historical source for it before the industrial era.

In agriculture, a terist is a piece of sloped plane that has been landscaped into a series of successively receding flat surfaces or platforms, which resemble steps, for the purposes of more effective farming. This type of landscaping, therefore, is called terracing. Graduated terrace steps are commonly used to farm on hilly or mountainous terrain. Terraced fields decrease erosion and surface runoff, and are effective for growing crops requiring much water, such as rice.

Correct Option: D

In agriculture, a terist is a piece of sloped plane that has been landscaped into a series of successively receding flat surfaces or platforms, which resemble steps, for the purposes of more effective farming. This type of landscaping, therefore, is called terracing. Graduated terrace steps are commonly used to farm on hilly or mountainous terrain. Terraced fields decrease erosion and surface runoff, and are effective for growing crops requiring much water, such as rice.

Laterites are soil types rich in iron and aluminium, formed in hot and wet tropical areas. Nearly all laterites are rusty-red because of iron oxides. They develop by intensive and long-lasting weathering of the underlying parent rock. Tropical weathering (laterization) is a prolonged process of chemical weathering which produces a wide variety in the thickness, grade, chemistry and ore mineralogy of the resulting soils.

Correct Option: D

Laterites are soil types rich in iron and aluminium, formed in hot and wet tropical areas. Nearly all laterites are rusty-red because of iron oxides. They develop by intensive and long-lasting weathering of the underlying parent rock. Tropical weathering (laterization) is a prolonged process of chemical weathering which produces a wide variety in the thickness, grade, chemistry and ore mineralogy of the resulting soils.