Soil Science - Study Mode
[#361] The phosphorus in plant seeds is mainly
Correct Answer
(B) Phytin
Explanation
Solution: The phosphorus in plant seeds is mainly in the form of Phytin . Phytin is a calcium magnesium salt of phytic acid that occurs in plants as the main phosphorus storage reserve, especially in seeds or tubers and is used as a source of inositol.
[#362] A soil can be considered as Organic soil if it contains . . . . . . . . % organic matter.
Correct Answer
(D) 20%
Explanation
Solution: Soil can be considered Organic soil if it contains 20% organic matter. Soil organic matter provides numerous benefits to the physical and chemical properties of soil and its capacity to provide regulatory ecosystem services. It acts as a major sink and source of soil carbon (C).
[#363] CEC of vermiculite is
Correct Answer
(D) 100 - 200 Cmol c (P + )/kg
Explanation
Solution: Vermiculite is a hydrous phyllosilicate material that undergoes significant expansion when heated. Vermiculite is a 2 : 1 neutral clay, which means it has two tetrahedral sheets for every octahedral sheet.
Vermiculite has a high cation-exchange capacity (CEC) at 100 - 200 Cmol c (P + )/Kg .
[#364] Optimum dose should not be exceeded because it means
Correct Answer
(A) Cut in net profits
Explanation
Solution: The optimum dose is the minimum amount of any substance required to be given to any organism, whether it is a plant or animal or human to fulfill the nutritional requirement or to cure any illness. The optimum dose should not be exceeded because it means a cut in net profits .
[#365] Charge of brucite layer is
Correct Answer
(A) +ve
Explanation
Solution: Brucite is the mineral form of magnesium hydroxide. It is a common alteration product of periclase in marble, low-temperature hydrothermal vein mineral in metamorphosed limestones and chlorite schists. Brucite is a double hydroxide layer and is positively charged.