Soil Science - Study Mode
[#501] Which mineral shows Pleochorism?
Correct Answer
(D) Tourmaline
Explanation
Solution: Pleochroism is the property of a crystal showing different colours when viewed by light polarized in different directions. Tourmaline is a crystalline silicate mineral group in which boron is compounded with other elements. It is a gemstone mineral that shows Pleochroism.
[#502] Atomosphere is classified into 4 classes, i.e., Troposphere, stratosphere etc., are based on
Correct Answer
(A) Temperature
Explanation
Solution: Our atmosphere is classified into 4 classes i.e. Troposphere, Stratosphere, Mesosphere and Thermosphere. The basis of this classification is Temperature. The four main layers of the atmosphere have different temperature gradients creating the thermal structure of the atmosphere. Temperature increases with altitude and in others, it decreases.
[#503] One ha ern of water is equal to
Correct Answer
(D) Both A and B
Explanation
Solution: One ha ern of water is equal to 100 tonnes of water or 1,00,000 litres of water.
[#504] Plants sensitive to alkali will show poor yield when ESP is
Correct Answer
(B) > 10
Explanation
Solution: Plants sensitive to alkali will show poor yield when ESP is greater than 10. ESP is the exchangeable sodium percentage that measures the proportion of cation exchange sites occupied by sodium. Alkali soils are characterized by high sodicity and pH. These soils contain sodium ions as the dominant ions and tend to have low salinity and high pH values.
[#505] "Increase in yield of a crop as a result of increasing a single growth factor is proportional to the decrement from the maximum yield obtainable by increasing the particular growth factor" was described by
Correct Answer
(D) E. A. Mitscherlich
Explanation
Solution: “Increase in yield of a crop as a result of increasing a single growth factor is proportional to the decrement from the maximum yield obtainable by increasing the particular growth factor” is the Growth law and equation given by E. A. Mitscherlich .