Soil Science - Study Mode
[#581] A complex mixture of brown or dark brown amorphous and colloidal substances modified from the original tissues or synthesised by various soil organisms is referred as
Correct Answer
(D) Humus
Explanation
Solution: 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.
[#582] Fertilizers containing Cl - ions are not suitable for
Correct Answer
(B) Potato
Explanation
Solution: 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.
[#583] For Ectodynamomorphic Soil development, which are the active factor?
Correct Answer
(D) Both A and B
Explanation
Solution: 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.
[#584] Sulphur containg Vitamins are
Correct Answer
(D) Both A and B
Explanation
Solution: 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.
[#585] Differentiation between coniferous & desiduous plants are done by using which band of wave length in remote sensing?
Correct Answer
(C) Infrared band
Explanation
Solution: 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.