Soil Science - Study Mode

[#376] If pH of soil increases, then which of the following statement is false?
Correct Answer

(B) CEC decreases, AEC increases

Explanation

Solution: It pH of the soil increases, then CEC, Cation exchange capacity which is a useful indicator of soil fertility increases with an increase in the pH of the soil. AEC (Anion exchange capacity) represents the positive charge available to attract anions in soil and is not pH-dependent, as constant-charge soil particles carry no significant positive charge.

[#377] Most accurate instrument used to measure atmospheric pressure is . . . . . . . . barometer.
Correct Answer

(C) Fortin type

Explanation

Solution: Atmospheric pressure is measured by Barometer. However, the most accurate instrument used to measure atmospheric pressure is a Fortin-type Barometer . Fortin Barometer is the most commonly used barometer for calibration duties. It is a highly accurate instrument that provides measurement inaccuracy levels of between ±0.03% of full-scale reading and ±0.001% of full-scale reading depending on the measurement range.

[#378] Y-index value for illitic type clay is
Correct Answer

(B) 5 - 25

Explanation

Solution: An illite is a group of closely related non-expanding clay minerals. It is a secondary mineral precipitate, and an example of phyllosilicate, or layered alumino-silicate. Its structure is a 2 : 1 sandwich of silica tetrahedron-alumina octahedron-silica tetrahedron. The y-index value for illitic clay is between 5 - 25.

[#379] The soil is well flocculated if it has more of
Correct Answer

(C) Ca

Explanation

Solution: The soil is well flocculated if it has more Calcium . Flocculation is a process during which soil particles are dispersed in a solution contact and adhere to each other, forming clusters, flocks, flakes or clumps of a larger size. Soil particles will flocculate if the amount of soluble salts in the soil is increased.

[#380] Which country have monopoly in P deposits?
Correct Answer

(A) Morocco

Explanation

Solution: Morocco is the country that has a monopoly in P deposits. Morocco claims 75% of the planet’s known reserves of phosphorus, an essential ingredient in commercial fertilizer. It gives the North African country a near-monopoly on the multibillion-dollar global trade of the mineral mined from phosphate rock, with clients on every continent.