Soil Science - Study Mode

[#611] Which soil structure is best for cultivation?
Correct Answer

(B) Crumby

Explanation

Solution: Crumby is the soil structure that is best for cultivation. Soil structure is defined by the way individual particles of sand, silt and clay are assembled. It is determined by how individual soil granules clump, bind together and aggregate, resulting in the arrangement of soil pores between them. There are various types of soil structures apart from crumby Platy, Prismatic, Columnar, Blocky, Granular, Wedge and Lenticular.

[#612] MP buffer used for determination of Lime Rquirement, having pH of
Correct Answer

(B) 7.5

Explanation

Solution: MP buffer was used for the determination of Lime requirement, having a pH of 7.5. The primary purpose of Lime requirement Calculations (LBC) is to determine the lime requirement of soil to adjust it to the desired pH level. It is calculated based on the three factors that are: i) The initial pH of the soil ii) The desired or target pH iii) The soil’s LBC

[#613] Occurrence of quartz in high amounts makes a rock
Correct Answer

(B) Acidic

Explanation

Solution: The occurrence of quartz in high amounts makes a rock acidic . Rocks like granite, microgranite, and rhyolite rich in silica are acidic rocks and contain the minerals quartz and feldspar. Acidic rocks refer to the chemical composition of igneous rocks that has 63% weight % SiO 2 content. It usually contains more than 20% of free quartz.

[#614] Fibrous Clay mineral
Correct Answer

(D) Attapulgite

Explanation

Solution: The fibrous Clay mineral is Attapulgite . It is a magnesium aluminium phyllosilicate with the chemical formula (Mg, Al) 2 Si 4 O 10 (OH)·4(H 2 O) that occurs in a type of clay soil. It is a type of fuller’s earth. Attapulgite forms gel structures in fresh and saltwater by establishing a lattice structure of particles in fresh and saltwater by establishing a lattice structure of particles connected through hydrogen bonds.

[#615] 'Heterocysts' are specialized N fixing stricture, found in
Correct Answer

(B) BGA

Explanation

Solution: Heterocysts are specialized N fixing structures found in BGA (Blue green algae). A heterocyst is a differentiated cyanobacterial cell that carries out nitrogen fixation in aerobic conditions. It is formed during nitrogen starvation by some filamentous cyanobacteria. It works by differentiating highly specialized cells to provide fixed nitrogen to the vegetative cells in a filament.