Soil Science - Study Mode

[#396] One ton is equal to (kg)
Correct Answer

(B) 907

Explanation

Solution: The ton is a unit of measure principally a unit of weight. It is also used informally to mean a large amount of any material. In the United Kingdom, the Imperial ton is a statute measure and defined as 2,240 pounds (about 1016 kg). In the United States and Canada, a ton is defined to be 2000 pounds i.e. equals 907 kg.

[#397] A well developed soil have
Correct Answer

(D) All of these

Explanation

Solution: A developed soil or mature soil has three soil horizons whose physical, chemical, and biological characteristics differ from the layers above and beneath which help in nutrient supply and proper development of the plant. The A horizon is the top layer of the mineral soil horizons, often referred to as "topsoil." The B horizon is referred to as subsoil and consists of mineral layers which are significantly altered by pedogenesis. The C horizon is below the solum horizons. The C horizon is enriched with carbonates carried below the solum by leaching.

[#398] Alkali soils are generally found in
Correct Answer

(C) Arid and semi arid climate

Explanation

Solution: Alkali soils are clay soils with high pH. A poor soil structure and a low infiltration capacity. Alkali soils owe their unfavorable physio-chemical properties mainly to the dominating presence of sodium carbonate, which causes the soil to swell and difficult to settle. Alkali soils are very common in semi-arid and arid climates and cover more than 25% of the earth's surface.

[#399] Which one is Phosphorus solubilizing fungi?
Correct Answer

(B) Aspergillus

Explanation

Solution: The phosphorous solubilizing fungi are such fungi that can act on the phosphorous present in the organic matter of the soil and make it available for plant use. The isolated phosphate solubilizing fungi belonged to the genera of Aspergillus (55.69%), Penicillium spp. (23.35%) and Fusarium (9.8%). So, out of the given options, Aspergillus is phosphorus solubilizing fungi.

[#400] A soil solum includes
Correct Answer

(C) A + B - horizon

Explanation

Solution: A solum (plural, sola) in soil science consists of the surface and subsoil layers that have undergone the same soil forming conditions. In terms of soil horizon designations, a solum consists of A, E and B horizons and their transitional horizons and some O horizons.