Soil Science MCQ Question and Answer | Agriculture MCQ Question

Cellulose degraders are the organisms that can decompose cellulose, cellulose degradation is carried out by the enzymes called “cellulases”, responsible for the hydrolysis of β-1,4-linkages present in cellulose.
Some of the cellulose degraders are Trichoderma viridae, Trichurus and Paecilomyces.

The liquid limit (LL) or upper plastic limit is the e-water content at which the soil changes from a liquid state to an aplastic state.
The pF value is a quantity that indicates the quality of water contained in the soil. A pF value near 0 indicates that the soil is filled with water.
For the upper plastic limit or liquid limit, the pF value is 0.5.

Plant nutrient critical for nitrogen fixation in legumes is Molybdenum.
In legumes such as beans, peas, etc. molybdenum helps in the fixation of atmospheric nitrogen by the root nodules bacteria. The plant needs it to break down any nitrates taken up from the soil.

Fertilizers containing free acid should be packed in HDPE bags as these are water resistant with poor air permeability, safe and resistant to chemicals.
HDPE is High-density polyethylene, these are plastic bags are undoubtedly the most common in the world. The chemical composition of HDPE features long chains of straight molecules that are very linear from start to finish, HDPE polymers have minimal branching.

The average density of the earth's crust is 2.6 - 3.0 Mg/m³.
The mass of the earth is the standard unit of mass in astronomy that is used to indicate the masses of other planets, including rocky terrestrial planets and exoplanets. The earth's core accounts for 15% of the earth's volume more than 30% of the mass, the mantle for 84% of the volume and close to 70% of the mass, while the crust accounts for 1% of the mass.

H₂S gas produced in rice fields has synergistic effect on the availability of P.
The synergistic effect here refers to the yield due to the combined application of two nutrients being more than the yield expected based on the effects from the individual applications of the nutrients.
Thus the production of hydrogen sulphide gas in rice fields is good for the yield.

Gypsum is the chemical used to check the volatilization loss of Nitrogen from the compost pit.
Volatilization is the loss of nitrogen to the atmosphere as ammonia gas from the soils or fertilizer applied to soil surfaces. Gypsum improves the retention of N during composting.

Out of the following options, Clay loam has the highest water holding capacity. While the sandy soil has the least water holding capacity. The small particle size of the clay holds the water and the tiny pore spaces make water move slower through it. Thus, it holds water for a longer duration.

K release is more from Phlogophite. It is well known that non-exchangeable K release can greatly influence soil fertility.
Phlogophite is a yellow, greenish, or reddish brown member of the mica family of phyllosilicates. It is also known as magnesium mica with a chemical formula KMg₃AlSi₃O₁₀(F, OH)₂.

Aspergillus niger is used to test the status of potassium elements in the soil. It is used as a test organism for determining Mg, Cu, Zn, Mo, etc in soil.
Aspergillus niger is a haploid filamentous fungus that is used for waste management and biotransformation in addition to its industrial uses, such as the production of citric acid and extracellular enzymes.