Soil Science MCQ Question and Answer | Agriculture MCQ Question

Gypsum is an important amendment to the problem of alkaline soils widely occurring in the state of Rajasthan.
Gypsum is a soft sulphate mineral composed of calcium dehydrate. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard or sidewalk chalk. Gypsum is a common mineral, with thick and extensive sedimentary rocks.

Petrography means the description of rocks. It is the branch of science with the composition and properties of rocks. The person who studies petrography is called a petrographer. The classification of rocks is based on the information acquired during the petrographic analysis.

Muscovite is one of the most prominent members of the Mica group. It is a common mica, isinglass, or potash mica, is a hydrated phyllosilicate mineral of aluminum and potassium with the formula KAl₂(AlSi₃O₁₀)(F, OH)₂ or (KF)₂(Al₂O₃)₃(SiO₂)₆(H₂O).
It is the most common mica, found in granites, pegmatites, gneisses and schists, and as a contact metamorphic rock.

According to Biomass in soil, Fungi > actinomycetes > bacteria is the correct sequence as per the presence of living organisms in the biomass.
Biomass is organic, meaning it is made of material that comes from living organisms, such as plants and animals. It is a plant-based material used as fuel to produce heat or electricity.

Solodization also known as dealkalization is the process of gradual removal of sodium ions from the exchange sites.
It is nothing but the leaching of sodium from the upper soil horizons to remove alkalis. The sodium ions from the exchange sites can be removed by adding Gypsum to the soil. This process involves the dispersion of clay.

Calcium cyanamide is an amide fertilizer. It is an inorganic compound with the formula CaCN₂. It is the calcium salt of the cyanamide anion. In contact with water, it decomposes and liberates ammonia.
This chemical is used as fertilizer and is commercially known as nitrolime. It was first synthesized in 1898 by Adolph Frank and Nikoden Caro.

Pressure membrane apparatus is used to measure matric potential moisture content relations at potential values as low as 100 bar. Application of specific potential to set samples, their soil water contents are determined gravimetrically.
Saturated soil samples are placed on a semi-permeable cellophane membrane with microscopic pores. This membrane allows the passage of water from the sample but retains the air pressure applied to the upper surface of the membrane.

Potassium permanganate (KMnO₄) is the self-indicator among the following options. The self indicator is the chemical substance that can indicate the presence of the specific substance in the solvent mixture as a colour change at the end of the titration.
Potassium permanganate is a flexible and potent oxidant that can be used by overt or indirect titration to classify many compounds.

Jan Van Helmont gave the statement,” Water was the sole nutrient of plants”.
He demonstrated that plants do not simply take up the soil as they grow and concluded that water was the sole source of the increased weight of the plant.
He was the first to use a quantitative and ingenious experimental approach to show that plants obtain nutrition from the nutrients in the water.

Nickel is the element and the metal component of the urease enzyme. They are nickel-containing metalloenzymes of high molecular weight.
Ureases are found in numerous bacteria, fungi, algae, plants and some invertebrates, as well as in soils as soil enzymes. These enzymes catalyze the hydrolysis of urea into carbon dioxide and ammonia.