Soil Science - Study Mode

[#246] Amongst oil cakes, the highest nitrogen content is in
Correct Answer

(D) Groundnut cake

Explanation

Solution: Amongst oil cakes, the highest nitrogen content is in Groundnut cake and it about is about 7.3%. It has the highest nitrification rate also. N content of castor cake is 4.3. N content of the neem cake is 5.2. N content of the Coconut cake is 3.0.

[#247] Which mineral having wall-building property, thus used in drilling oil wells
Correct Answer

(A) Bentonite

Explanation

Solution: Bentonite is a mineral having wall-building property, thus used in drilling oil wells. The bentonite in the flush fluid lubricates and cools the cutting tools while protecting against corrosion. As the drilling fluid generates hydrostatic pressure in the borehole, it hinders fluid and gas penetration.

[#248] Chlorites is a . . . . . . . . mineral
Correct Answer

(A) 2 : 2 type

Explanation

Solution: The chlorites are a group of phyllosilicate minerals common in low-grade metamorphic rocks and altered igneous rocks. Chlorite forms blue-green crystals resembling mica. The general formula for chlorite is (Mg, Fe) 3 (Si, Al) 4 O 10 (OH) 2 ยท(Mg, Fe) 3 (OH) 6 . This formula emphasizes the structure of the group, as TOTO, and consists of alternating TOT layers and O layers. It is a 2 : 2 type.

[#249] The lithosphere is mainly made up of
Correct Answer

(A) Igneous rocks

Explanation

Solution: The lithosphere is the rigid, outermost shell, rocky part of our earth. It is composed of the crust and the portion of the upper mantle. It extends to a depth of about 60 miles. It is broken into about a dozen separate, rigid blocks, or plates. The lithosphere is mainly made up of Igneous rocks , made up by the cooling of magma.

[#250] Water at wilting coefficient is held with a force of
Correct Answer

(A) 15 atm

Explanation

Solution: Water at wilting coefficient is held with a force of 15 atm (atmospheres). The wilting coefficient of soil water is defined as the percentage water content of a soil when the plants growing in that soil are first reduced to a wilted condition from which they cannot recover in an approximately saturated atmosphere without the addition of water to the soil.