Soil Science - Study Mode

[#701] 2 : 1 : 1 type of clay mineral contain and extra sheet of . . . . . . . . as compared to 2 : 1 type of clay minerals
Correct Answer

(C) Brucite

Explanation

Solution: 2 : 1 : 1 type of clay mineral contains an extra sheet of Brucite as compared to the 2 : 1 type of clay minerals. Brucite is the mineral form of magnesium hydroxide and is a common alteration product of periclase in marble. It adopts a layered Cdl 2 - like structure with hydrogen bonds between the layers.

[#702] Main objective of puddling in paddy is to
Correct Answer

(B) Create impermeable layer in the soil

Explanation

Solution: Soil puddling is the process of working saturated or near saturated soil into soft structureless mud. In simple words, it can be called tillage in rice while flooded. The main objective of puddling in paddy plantations is to create an impermeable layer in the soil, which is the first requirement of submerged plantations in paddy. It reduces the percolation rates of water by churning clay particles and making them close many soil pores.

[#703] Which of the following is a micronutrient?
Correct Answer

(D) Zinc

Explanation

Solution: There are overall 17 essential nutrients required by the plants for proper growth and development. Out of them, 10 are macronutrients that are required in large amounts whereas 7 are micronutrients that are required in traces. Boron, Zinc, Manganese, Copper, Molybdenum, iron and chlorine are micronutrients.

[#704] Which type of fertilization enhances manuring properties of Green Manures?
Correct Answer

(B) Phosphatic

Explanation

Solution: Green manures are the crops specifically produced to be incorporated into the soil while still green. The main aim is to add organic matter to the soil for its benefit. Green manuring is mostly used with legume crops to add nutrients to the soil, especially in organic farming. Phosphatic fertilizers enhance the manuring properties of green manures.

[#705] Which of the followings is a secondary mineral
Correct Answer

(C) Dolomite

Explanation

Solution: Dolomite is a secondary mineral among the given options. When rock minerals undergo a transformation process due to the change in temperature and pressure like metamorphism and weathering, the newly created stable minerals are known as secondary minerals. Dolomite is an anhydrous carbonate mineral composed of calcium and magnesium carbonate. It is sedimentary carbonate rock.