Soil Science - Study Mode

[#176] Which one is example of Sedentary Soil?
Correct Answer

(A) Black soil

Explanation

Solution: Sedentary soil is soil remaining on the rock from which it has developed or on which they are situated. Black soil is an example of sedentary soil. Black soils are mineral soils that have a black surface horizon, enriched with organic carbon. It is the third major group of soil found in India.

[#177] Geological erosion is also known as
Correct Answer

(D) Natural erosion

Explanation

Solution: Geological erosion is also known as Natural erosion. It is the action of surface processes that removes soil, rock or dissolved material from one location of the Earth’s crust, and then transports it to another where it is deposited by the action of wind or water. The geological type of erosion contributes to the formation of soils and their distribution on the earth's surface.

[#178] Ultisol is comparable with alfisol except for having
Correct Answer

(D) Low BS%

Explanation

Solution: Ultisols are strongly leached, acid forest soils with relatively low native fertility. They are found primarily in humid temperate and tropical areas of the world. Alfisols are moderately leached soils that have relatively high native fertility. These are primarily found in temperate humid and subhumid regions of the world. Alfisols have at least 35% base saturation, meaning calcium, magnesium, and potassium are relatively abundant. This is in contrast to ultisols, which are the more highly leached forest soils having less than 35% base saturation. That means Ultisol is comparable with alfisol except for having low BS% where BS is base saturation.

[#179] The Fe-chelate suitable for application to crops grown on calcareous soils is
Correct Answer

(B) Fe-EDDHA

Explanation

Solution: Fe-EDDHA is the Fe-chelate suitable for application to crops grown on calcareous soils. This chelated iron helps in correcting iron deficiency in flowers, vegetables, shrubs, and trees. EDDHA is a chelate that protects nutrients against precipitation in a wide pH range of 4 - 9. And the availability of iron to plants is reduced through preci[piatation of iron at high pH, or by high concentrations of phosphorus.

[#180] The particle size of silt soil is
Correct Answer

(C) 0.002 – 0.05 mm

Explanation

Solution: Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. It is a common material, making up to 45% of average modern mud, found in many river deltas and as wind-deposited accumulations. Silt is made up of rock and mineral particles that are larger than clay but smaller than sand. It ranges from 0.002 to 0.05 mm in diameter.