Soil Science - Study Mode

[#81] Inorganically formed sedimentary rock is
Correct Answer

(C) Gypsum

Explanation

Solution: An inorganically formed sedimentary rock is Gypsum . Gypsum is a soft sulphate mineral composed of calcium sulphate dihydrate. It is a common mineral, with thick and extensive evaporate beds in association with sedimentary rocks. Deposits are known to occur in strata from as far back as the Archaean eon.

[#82] IFFCO was formed in the year of
Correct Answer

(B) 1967

Explanation

Solution: IFFCO (Indian Farmers Fertilizer Cooperative) was formed on 3 rd November 1967 and is headquartered in New Delhi. It is a multi-state cooperative society and is wholly owned by the cooperative societies of India. Society is engaged in the business of manufacturing and marketing fertilizers.

[#83] CEC of humus is
Correct Answer

(D) 250 - 350

Explanation

Solution: CEC is cation exchange capability and varies according to the type of soil. Humus, the end product of decomposed organic matter, has the highest CEC value because organic matter colloids have large quantities of negative charges. Humus has a CEC two to five times greater than montmorillonite clay and up to 30 times greater than kaolinite clay, so is very important in improving soil fertility. CEC of humus is 250 - 350.

[#84] Which nutrient element determines the quality of produce?
Correct Answer

(B) K

Explanation

Solution: Potassium is the nutrient element that determines the quality of produce. Potassium is one of the essential macronutrients for plant growth. It is an activator of dozen of enzymes, such as protein synthesis, sugar transport, N and C metabolism and photosynthesis. Potassium is associated with the movement of water, nutrients and carbohydrates in plant tissue.

[#85] The term functional or metabolic nutrient was given by
Correct Answer

(B) D. J. Nicholas

Explanation

Solution: The term functional or metabolic nutrient was given by D. J. Nicholas . There are 20 mineral elements necessary or beneficial for plant growth. Carbon, hydrogen and oxygen are supplied by air and water. The 6 macronutrients, nitrogen, phosphorus, potassium, calcium magnesium and Sulphur are required by plants in large amounts. Iron, manganese, boron, molybdenum, copper, zinc, chlorine and cobalt as micronutrients.