Soil Science MCQ Question and Answer | Agriculture MCQ Question

Dolomite is a secondary mineral among the given options.
When rock minerals undergo a transformation process due to the change in temperature and pressure like metamorphism and weathering, the newly created stable minerals are known as secondary minerals.
Dolomite is an anhydrous carbonate mineral composed of calcium and magnesium carbonate. It is sedimentary carbonate rock.

Bone meal is a mixture of finely and coarsely ground animal bones and slaughterhouse waste products. It is a slow-release organic fertilizer, it supplies Phosphorus, Calcium and a small amount of Nitrogen to plants.
As the bone meal is water-insoluble, it needs to be broken down before the plant can absorb it, either by soil acidity or microbial activity-producing acids. That is why the bone meal is considered well suited for Acidic soil.

-250 is the one among the following values given in terms of redox-potential of soils (mv) representing a highly reduced condition of the soil.
Redox potential indicates how oxidized or reduced the soil is as well as the electron availability in the soils. It is usually determined by measuring the potential difference between an inert electrode installed in the soil and a reference Ag/AgCl or calomel electrode at the soil surface.

The presence of VAM enhances the uptake of nutrients in general but particularly Phosphorus.
VAM stands for vesicular-Arbuscular Mycorrhizae formed by the symbiotic association between certain phycomycetous fungi and angiosperm rots.
It can dissolve the phosphates found in abundance in the soil. Apart from increasing the availability of phosphorus, it provides the plants with the strength to resist disease germs and weather conditions.

At pH < 6.5, NO form of Nitrogen is lost from the soil. Nitrous oxide arises from soils via the two biological pathways of nitrification and denitrification.
Nitrogen levels affect soil pH. It increases soil acidity unless the plant directly absorbs the ammonium ions. The greater the nitrogen fertilization rate, the greater the soil acidification.

Basalt rock is volcanic (extrusive) in nature.
Extrusive igneous rock is also known as volcanic rock and is formed by the cooling of molten magma on the earth's surface.
Basalt is a mafic extrusive rock, is the most widespread of all igneous rocks, and comprises more than 90% of all volcanic rocks. Because of its relatively low silica content, basalt lava has a comparatively low viscosity and forms thin flows that can travel long distances.

Intracellular deposits of Silicon element is known as Plant opals.
Plant opals are microscopic amorphous siliceous bodies that occur in living plants. It can also be called a plant-derived silica body excavated from the soil.
These are commonly found in plants in the leaf epidermis and outermost covering of seeds and fruits, the epidermis of bracts that surround and protect grass seeds and in the sub-epidermal tissue of orchid and palm leaves.

'Annals of Agriculture' a book was written by Arthur Young.
It is the official journal of the faculty of agriculture. It aims to maximize the quality of the agricultural sector across the globe with an emphasis on the Arabian countries by focusing on publishing high-quality applicable research, in addition to the new methods and frontiers leading to maximizing the quality and quantity of both plant and animal yield and final products.

Zinc is the plant nutrient that moves from the soil to the roots by root interaction, mass flow, and diffusion in equal proportion.
Zinc is not mobile in the soil. It tends to stay where it has been placed. Crop-up take is therefore reliant on the plant roots growing intercepting the applied zinc rather than zinc moving in the soil solution to the roots. In some cases, roots may induce zinc deficiency.

Carbonic Anhydrase and superoxide dismutase enzyme activity are related to the Zinc element.
Zinc activates enzymes of protein metabolism, and is a part of carbonate dehydratase, and superoxide dismutase.
The zinc ion creates the catalytic center in Superoxide dismutase.
Carbonate dehydratases form a family of enzymes that catalyzes the interconversion between carbon dioxide and water and dissociated ions of carbonic acid. The active site of most carbonic anhydrases contains a zinc ion.