Soil Science MCQ Question and Answer | Agriculture MCQ Question

The soil air contains several gases of which nitrogen, oxygen, carbon dioxide and water vapor are the most important. Soil air is present in the pores or cavities present in between the loosely bound soil particles. Soil sir constantly moves from the soil pores into the atmosphere and from the atmosphere into the pore spaces.
79.2% of nitrogen is present in the soil air, it percentage is more than the atmospheric air.

8-bit colour graphics are a method of storing image information in a computer's memory or a memory file so that each pixel is represented by 8-bits (1 byte).
The maximum number of colours that can be displayed at any one time is 256.
8-bit images having PIXEL value in the range between 0-255.

Split application refers to the utilization of a sequence of two or more nutrient applications, separated by approximately three weeks or more, to a single crop to improve nutrient uptake efficiency.
Split application of K (Potassium) is useful in high rainfall areas to save on Leaching. Leaching makes the nutrients lost from the top layer by percolation or heavy rain.

In soil taxonomy, the Great group is defined largely based on the Diagnostic surface horizon.
Soil taxonomy is a morphogenetic soil classification system using diagnostic horizons, soil moisture or temperature regimes, and features to infer pathways of soil genesis and formation. It employs a unique mnemonic system based on Greek, Latin or other root words for assigning names to taxonomic classes.

Nepheline is a rock-forming mineral in the feldspathoid group-a silica-undersaturated aluminosilicate that occurs in intrusive and volcanic rocks with low silica and in their associated pegmatites.
Nepheline is igneous in origin and is rich in Na & K.
It is used in glass and ceramic manufacturing and other industries.

Slickenside is a smoothly polished surface caused by frictional movement between rocks along the two sides of a fault. It is a surface of the cracks produced in soils containing a high proportion of swelling clays.
In black soils, slickensides are found in Subsoil, the layer just below the topsoil.

Granite and Basalt are examples of Igneous rocks, which are formed by the solidification and crystallization of magma.
Granite is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground.
Basalt is a fine-grained extrusive igneous rock formed from the rapid cooling of low viscosity lava rich in magnesium and iron exposed at or very near the surface of a rocky planet or moon.

The most important source of Sulphur for Indian soils is SSP.
SSP (single super phosphate) was the first commercial mineral fertilizer, and it is the foundation for the development of the new plant nutrient industry. It is the only Sulphur providing fertilizer in India that contains water-soluble phosphorus easily absorbed by plants.
This multi nutrient fertilizer contains phosphorus (14.5%), Sulphur (11%) and calcium (21%).

Magnesium is the central atom of the chlorophyll molecule located in the centre of the porphyrin head, with each molecule containing 6.7% magnesium.
Chlorophyll pigment in the leaves absorbs the sunlight that excites the electrons in the molecules, enabling them to be transferred to other molecules. Chlorophyll and magnesium are connected in this step because magnesium helps the molecule absorb light and keeps the electrons in an excited state so that they can be transferred.

Hidden Hunger refers to a condition in which a crop needs more of a given nutrient yet has shown no deficiency symptom. With most nutrients on most crops, significant responses can be obtained even though no recognizable symptoms have appeared.
Testing of plants and soils helps plan or modify plant-nutrient programs to avoid this problem of hidden hunger in subsequent crops.