Soil Science - Study Mode

[#196] Activated sludge contains
Correct Answer

(B) 3-6% N, 2% P 2 O 5 and 1.0% K 2 O

Explanation

Solution: The activated sludge is a type of biological wastewater treatment process for treating sewage or industrial wastewater using aeration and a biological floc composed of a mixed blend of microorganisms, 95% of which are a variety of mostly aerobic species of bacteria, and also contains fungi, protozoa and higher forms of invertebrates along with some essential nutrient elements. The nutrient elements it contains are 3 - 6% N, 2% P 2 O 5 and 1.0% K 2 O.

[#197] Zn-EDTA contains . . . . . . . . % Zn.
Correct Answer

(C) 12%

Explanation

Solution: Zn-EDTA contains 12% of Zinc. It contains zinc chelated with EDTA (Ethylene Diamine Tetra Acetic Acid). It is used as a fertilizer to overcome zinc deficiency in plants, as well as a source of zinc for those plants which require Zinc for their normal growth and higher yields.

[#198] Hydrogen bonding takes place in the interlayer of
Correct Answer

(A) Kaolinite

Explanation

Solution: Hydrogen bonding takes place in the interlayer of Kaolinite . Kaolinite is a clay mineral, with the chemical composition Al 2 Si 2 O 5 (OH) 4 . It is a layered silicate mineral, with one tetrahedral sheet of silica linked through oxygen atoms to one octahedral sheet of alumina octahedral.

[#199] Which of the following nutrient is absorbed in both positive and negative forms?
Correct Answer

(D) Nitrogen

Explanation

Solution: Nitrogen is a nutrient element that is absorbed in both positive and negative forms. It is absorbed in the form of ammonium ion i.e. NH 4 + is a positive ion. Also, it is absorbed as nitrate ion i,e. NO 3 - , that is a negative ion.

[#200] End product of denitrification process is
Correct Answer

(D) None of these

Explanation

Solution: Denitrification is the microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen. The preferred nitrogen electron acceptors in order of most to least thermodynamically favourable include nitrate, nitrite, nitric oxide and nitrous oxide finally resulting in the production of nitrogen gas completing the nitrogen cycle. The end product of the denitrification process is N 2 O and ultimately nitrogen gas, which is released back into the atmosphere.