Soil Science - Study Mode

[#621] The density measured by
Correct Answer

(A) $${ ext{D}} = frac{{{ ext{Mass}}}}{{{ ext{Volume}}}}$$

Explanation

Solution: The density of a substance is its mass per unit volume. Mathematically, density can be represented as $${x08f{D = }}frac{{{x08f{Mass}}}}{{{x08f{Volume}}}}$$ For a pure substance, the density has the same numerical value as its mass concentration. Different materials usually have different densities and they may be relevant to buoyancy, purity, and packaging. The density of a material varies with temperature and pressure.

[#622] Which one of the following is not a Mn mineral
Correct Answer

(D) Tenorite

Explanation

Solution: Out of the given options, Tenorite is not a Manganese mineral whereas, all other Pyrolusite, Hausmanite, and Rhodonite are manganese minerals. Tenorite is a copper oxide mineral with the chemical formula CuO. It occurs in the weathered or oxidized zone associated with deeper primary copper sulphide orebodies.

[#623] The toxicity of zinc in soil is reduced by adding
Correct Answer

(A) Superphosphate

Explanation

Solution: The toxicity of zinc in the soil is reduced by adding Superphosphate . Phosphorus in superphosphate causes zinc content in soil to decrease. Zinc toxicity is a medical condition involving an overdose on or toxic overexposure to zinc. The general symptoms are stunting of the shoot, curling and rolling of young leaves, death of leaf tips and chlorosis.

[#624] Unit of measurement of cloud cover
Correct Answer

(A) Octa

Explanation

Solution: The unit of measurement of cloud cover is Octa . It is a unit of measurement used to describe the amount of cloud cover at any given location such as a weather station. Sky conditions are estimated in terms of how many eighths of the sky are covered in clouds, ranging from 0 oktas. In addition, in the SYNOP code, there is an extra cloud cover indicator '9' indicating that the sky is obscured, which may be due to fog or heavy snow.

[#625] Rhizobia penetrate the root through
Correct Answer

(C) Root hairs

Explanation

Solution: Rhizobia are the group of bacteria, that survive and reproduce in the soil, and fix atmospheric N inside the nodules produced in the roots of their specific legume. Rhizobia penetrate the root through Root hairs and once they get inside there they grow and divide inside a tubule called an infection thread.