Soil Science MCQ Question and Answer | Agriculture MCQ Question

Specific Volume is the physical parameter that is an index of the degree of compaction or looseness of the soil. The degree of compaction is determined as the ratio between the maximum dried density of soil from the tests of moisture density relations of soils and soil density measured in situ conditions.
Specific volume is a property of materials defined as the number of cubic meters occupied by one kilogram of a particular substance.

In a dried plant, an essential element that constitutes the bulk of its weight is Carbon. As we know carbon is the most abundant element present within the plant that is obtained from the carbon dioxide from the air. Thus, carbon constitutes the maximum portion of its weight.

The chemical used to differentiate between light and heavy minerals is Bromoform.
It is a brominated organic solvent, colourless liquid at room temperature, with a high refractive index, very high density, and sweet odor similar to that of chloroform. Bromoform is used a reagent, solvent, sedative and a flame reatardant.

In GPS, at least 4 satellites are required to locate a point. It means at least four satellites are essential to calculate a precise location on the Earth using GPS, i.e. Global Positioning System. Out of the four, three are required to determine a position on the earth and one is required to adjust for the error in the receiver's clock.

Nitrogen fertilizers are supposed to be very essential for the growth and development of plants, but their excess delays maturity.
As nitrogen enhances the foliage growth, thus the weak stems become less able to support the plant, moreover, root growth is also stunted, which leads to the weak support system of a plant. Eventually, the maturity and growth of the plant are delayed and sometime may cause the death of the plant.

Intrazonal soils have more or less well-defined soil profile characteristics that reflect the dominant influence of some resident factors of relief or parent material over the classic zonal effects of climate and vegetation.
Intrazonal soils are mainly under the influence of Local conditions. It includes humic clay and solonetz (dark alkaline soils) types found close to lakes and lagoons.

The maximum fixation of K occurs in 2 : 1 type clay minerals.
Potassium fixation occurs when potassium ions form a surface complex with oxygen atoms in the interlayers of certain silicate clay minerals. Potassium availability is affected by a variety of factors, one of them is soil moisture, soil moisture is required to liberate fixed potassium and provide the soil solution necessary for plant intake.

With the addition of electrolytes in a soil-colloidal system, the thickness of the Double Diffuse layer will Decrease.
The soil colloidal system is the most active constituent of the soil and it determines the physical and chemical properties of the soil. And double diffuse layer is an ionic structure that describes the variation of electric potential near a charged surface, such as clay, and behaves as a capacitor.

Rocks formed by the solidification of molten magma at the surface of the earth are called Igneous Rock. The magma can be derived from partial melts of existing rocks in either a planet’s mantle or crust. Solidification into rock occurs as intrusive rocks or as Extrusive rocks. Igneous rocks form about 15% of the Earth's current land surface.

Biosuper is a fertilizer containing Rock phosphate + Elemental Sulphur + S. oxidizing bacteria. It is a granular Humate-based fertilizer incorporating nitrified Brown coal, Varying forms of Kiln Dust, Sulphur as Sulphate, calcium, Magnesium and Reactive Phosphate rock.
It is designed for crops and pastures with higher levels of sustainable slow-releasing forms of Phosphorus.