Soil Science - Study Mode
[#241] CaCO 3 (lime) is added to reclaim
Correct Answer
(D) Acidic soil
Explanation
Solution: CaCO 3 (lime) is added to reclaim Acidic soil. it helps in balancing the pH level of acidic soil. Liming is a desirable practice to overcome constraints of soil acidity for enhanced crop production. It involves the application of limestone, hydrated lime, chalk or other materials, which are rich in calcium and magnesium that can increase the soil pH through the improved base solution.
[#242] In remote sensing, vegetation gives maximum reflectance in which spectral band?
Correct Answer
(A) NIR
Explanation
Solution: In remote sensing, vegetation gives maximum reflectance in NIR spectral band. NIR is a near-infrared radiation band of spectrum, the NIR bands become weaker and weaker as the wavelength region goes down to a shorter wavelength region. While in remote sensing, vegetation cover gives maximum reflectance in the NIR band. Remote sensing measures the wavelengths of light absorbed and reflected by the green plants, and the presence of pigments in leaves strongly absorbs wavelengths of visible Red light.
[#243] Continuous heavy rainfall leads to the formation of
Correct Answer
(B) Acid soil
Explanation
Solution: Continuous heavy rainfall leads to the formation of acid soil . Heavy rainfall leads to numerous hazards for soil and plants like flooding, agricultural runoff, leaching and loss of crops and livestock. Rainfall is naturally acidic, due to the formation of carbonic acid from carbon dioxide in the atmosphere, and this type of rainfall causes rapid acidification of soil.
[#244] Fluor apatite is a rich source of
Correct Answer
(B) Phosphorus
Explanation
Solution: Fluor apatite is a phosphate mineral with the chemical formula Ca 5 (PO 4 ) 3 F. It is a hard crystalline solid. It is an important source of both phosphoric and hydrofluoric acids. It occurs widely as an accessory mineral in igneous rocks and calcium-rich metamorphic rocks.
[#245] For manufacturing of K 2 O which of the following
Correct Answer
(B) Biotite
Explanation
Solution: For manufacturing K 2 O Biotite is used. Biotite is a common group of phyllosilicate minerals within the mica group. Its chemical formula is K(Mg, Fe) 3 AlSi 3 O 10 (F, OH) 2 . It is regarded as a mineral species by the International Mineralogical Association until 1998.