Soil Science - Study Mode

[#481] Urea hydrolysis in the soil produces
Correct Answer

(C) Ammonium carbonate

Explanation

Solution: Urea hydrolysis results in an increase in soil pH around the urea granules, thereby subjecting the NH 4 + produced to volatilization in form of NH 3 in the presence of the enzyme Urease. Urea hydrolysis in soil produces ammonium carbonate and finally ammonium and carbonic acid.

[#482] The anion exchange capacity (AEC) increase as soil pH
Correct Answer

(B) Decreases

Explanation

Solution: Anion exchange capacity (AEC) represents the positive charge available to attract anions in solutions. Soils that have an anion exchange capacity typically contain weathered kaolin minerals, iron and aluminum oxides and amorphous materials. It is dependent upon the pH of the soil and the anion exchange capacity (AEC) increases as soil pH Decreases.

[#483] The weathered material transported by means of water and deposited in river basins are termed as
Correct Answer

(A) Alluvial

Explanation

Solution: The weathered material transported through water and deposited in river basins is termed Alluvial . An alluvial fan is a triangle-shaped deposit of gravel, sand and even smaller pieces of sediment, such as silt. This sediment is called alluvium. Alluvial fan are usually created as flowing water interacts with mountains, hills and steep walls of canyons.

[#484] Barkhan & Inselberg are formed due to action of
Correct Answer

(A) Wind

Explanation

Solution: Barkhan & Inselberg are formed due to the action of wind. Barkhan is a crescent-shaped dune produced by the action of wind predominantly from one direction. An inselberg is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain.

[#485] Select the wrong pair from the following given below
Correct Answer

(D) Hematite : FeOOH

Explanation

Solution: Strengite is a relatively rare iron phosphate mineral with the formula FePO 4 ·2H 2 O. Variscite is a hydrated aluminum phosphate mineral with the formula AlPO 4 ·2H 2 O. it is a relatively rare phosphate mineral. Gibbsite is one of the mineral forms of aluminium hydroxide with the chemical formula Al 2 O 3 ·3H 2 O. It is an important ore of aluminium. Hematite is a heavy and relatively hard oxide mineral, ferric oxide (Fe 2 O 3 ), that constitutes the most important iron ore because of its high iron content (70 percent) and its abundance.