Soil Science MCQ Question and Answer | Agriculture MCQ Question

Urea also known as carbamide, is an organic compound with the chemical formula CO(NH₂)₂. Urea belongs to the Amide group. This amide has two NH₂ groups joined by a carbonyl (C=O) functional group.
Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use.

Soil fertility refers to the ability of soil to sustain agricultural plant growth, provide plant habitat and result in sustained and consistent yields of high quality.
Fertile soil has more available nutrients and water in adequate amounts and proportions for plant growth and reproduction.

If the moisture content of 0 - 15 cm, the soil layer is 22%, then the moisture content in depth will be 3.3 cm.
Soil moisture content was lower in topsoil (0 - 20 cm) compared to deeper soil (40 - 80cm). And the moisture content is then calculated by subtracting the weight of the dry soil from the weight of the moist soil and then dividing by the weight of the dry soil.

Mulching is one of the biological methods of soil conservation.
Mulching is the placement of any organic or inorganic material over the top of a soil surface to protect it. It helps in the conservation of soil moisture, improves soil fertility and health of the soil, reduces weed growth, and enhances the visual appeal of the area.

A complex mixture of brown or dark brown amorphous and colloidal substances modified from the original tissues or synthesized by various soil organisms is referred to as Humus.
Humus is a colloidal substance and increases the cation-exchange capacity of the soil, hence its ability to store nutrients by chelation. While these nutrient cations are available to plants, they are held in the soil and prevented from being leached by rain or irrigation.

Fertilizers containing chlorine ions are not suitable for Potato, as it is a chlorine-sensitive crop. For such crops only fertilizers containing potassium in the form of sulphate should be used.
Potato is sensitive to chloride ions because it hinders the transportation of carbohydrates of photosynthesis from the leaves into the tuber, which results in an excess of starch in the leaves whereas a limited percentage of starch is stored in tubers and we all know potato tuber is a carbohydrate-rich food.

Both Biosphere and Climate are the active factors for ectodynamorphic soil development. Ectodynamomorphic soil is the development of a normal profile under the influence of climate and vegetation. Although soil properties are influenced by parent material.

Both Thiamine and Biotin are Sulphur containing vitamins.
Thiamine is an essential micronutrient and chemically it is consist of an aminopyrinimidine and a thiazolium ring linked by a methylene bridge and Sulphur is linked in its structure.
Biotin is involved in a wide range of metabolic processes and is a heterocyclic compound, with a Sulphur containing ring fused ureido and tetrahydrothiophene group.

Differentiation between coniferous & deciduous plants is done by using the infrared band of wavelength in remote sensing.
The major spectral difference between deciduous and coniferous forests is in the NIR plateau (750 - 1300 nm), a spectral region with high reflectance for the green vegetation.

Colorimetric is the most common method of determining soluble B in soil.
The colorimetric analysis is a method of determining the concentration of a chemical element or chemical compound in a solution with the aid of a colour reagent.
Colorimetric assays are the simplest and cheapest methods to determine boron concentration in soil.