Soil Science - Study Mode

[#431] Which of the following is a non-metalic nutrient?
Correct Answer

(C) Boron

Explanation

Solution: Boron is the non-metallic nutrient. Boron plays a key role in a diverse range of plant functions including cell wall formation and stability, maintenance of structural and functional integrity of biological membranes, movement of sugar or energy into growing parts of plants and pollination and seed set.

[#432] Soil formation is
Correct Answer

(C) A slow and continuous process

Explanation

Solution: Soil formation is defined as the transformation of rock material into the soil. Soil formation is the process of soil genesis as regulated by the effects of place, environment and history. Soil formation is a slow and continuous process. It is influenced by five factors, that are parent material, climate, topography, organisms and time.

[#433] The specific gravity of laboratory grade H 3 PO 4 is (in g mL -1 )
Correct Answer

(D) 1.70

Explanation

Solution: Phosphoric acid is an inorganic compound with the chemical formula H 3 PO 4 . It is a colourless, odourless and non-volatile syrupy liquid. The specific gravity of any liquid is the "the ratio of the density of the liquid to the density of water at 4 degrees Celcius". the specific gravity of laboratory grade H 3 PO 4 is 1.70 g/ml .

[#434] 'White alkali' soils are
Correct Answer

(B) Saline soil

Explanation

Solution: White alkali is the mixture of salts like, sodium sulphate, sodium chloride, etc. forming a white crust on some alkali soils. White alkali is saline soil. these are the soil with high pH, a poor soil structure and a low infiltration capacity, because of which it forms a hard calcareous layer.

[#435] In Mitscherlich technique . . . . . . . . plants are grown to maturity
Correct Answer

(B) Oat

Explanation

Solution: In the Mitscherlich technique oats plants are grown to maturity. It is performed for soil fertility investigations and is for the study of the trend of the yields from a series of plants grown to maturity. In this technique, oats are grown to maturity in pots containing 6 lb of soil. A total of 10 pots are used. The yields of N-P and N-K treatments are expressed as a percentage of the yield from the complete N-P-K treatment.