Soil Science MCQ Question and Answer | Agriculture MCQ Question

Redox potential is a measure of the ease with which a molecule will accept electrons, which means that the more positive the redox potential, the more readily a molecule is reduced.
The redox potential is stimulated by the variation of a specific biological nitrification or denitrification process. The value of redox potential for nitrification should be > + 250 mV.

Among the given options, Garnet is the chromium-containing mineral. It is a member of a group of common silicate minerals that have similar crystal structures and chemical compositions. It may be colorless, black and many shades of red and green.
Garnet comprises a group of silicates with may contain calcium, iron, magnesium, manganese, aluminum, chromium and many more elements in traces.

Soil fertility gradient (SFG) is the spatial pattern of variability in soil. Fertility gradients were created by applying graded doses of fertilizer N, P and K on the strips.
The experiment on the Fertility gradient was proposed and conducted by B. Ramamoorthy in 1967.

Approximately 10% of the total incoming solar radiation is absorbed by the soil and can be used to warm it. Whereas about 70% of the total incoming solar energy is absorbed by the Earth system or we can say our environment and the remaining 30% is reflected in space.

A catena in soil science is a series of distinct but co-evolving soils arrayed down a slope. A mature catena is in equilibrium as the processes of deposition and erosion are in balance.
The catena concept originated in central Uganda, by chemist W. S. Martin to describe a hill slope sequence at the Bukalasa station.
The term catena was first coined by scientist Geoffrey Milne to describe these soil-topography units.

Phosphorus (P) is considered a highly mobile element within plants.

It moves easily from older tissues to younger tissues where it is needed for growth.

This mobility is crucial for various physiological processes, including energy transfer and photosynthesis.

CAN is calcium ammonium nitrate, also known as nitro-limestone or nitrochalk. It is a widely used inorganic fertilizer, accounting for 4% of all nitrogen fertilizers used.
It is hygroscopic, and its dissolution in water is endothermic. It accounts for roughly 8% calcium and 21 - 27% nitrogen. It is preferred for use on acidic soil, but it is not acid forming fertilizer as it contains Calcium.

The enzyme responsible for the hydrolysis of urea is Urease. It catalyzes the hydrolysis of urea, forming ammonia and carbon dioxide.
It is found in numerous bacteria, fungi, algae, plants and some invertebrates and also in soils, as a soil enzyme. They are nickel-containing metalloenzymes of high molecular weight.

SSP is the most popular phosphatic fertilizer after Dap as it contains 3 major plant nutrients i.e. Phosphorus, Sulphur and Calcium along with traces of other micronutrients.
Free phosphoric acid in both the SSP whether it is powdered or granulated is 4% maximum. Phosphoric acid yields more available phosphorus hence it can be directly used as a fertilizer.