Soil Science - Study Mode
[#706] Bone meal is well suited for
Correct Answer
(A) Acidic soil
Explanation
Solution: 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.
[#707] Which one of the following values given in terms of redox-potential of soils (mv) represents a highly reduced condition of the soil
Correct Answer
(A) -250
Explanation
Solution: -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.
[#708] The presence of VAM enhances up take of nutrients in general but particularly of
Correct Answer
(D) P
Explanation
Solution: 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.
[#709] In which form N will be lost from soil at pH < 6.5?
Correct Answer
(B) NO
Explanation
Solution: 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.
[#710] Which rock is volcanic (extrusive) in native
Correct Answer
(C) Basalt
Explanation
Solution: 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.