Soil Science - Study Mode

[#401] The height of a stack of bags should not be more than
Correct Answer

(C) 20 bags

Explanation

Solution: Stacking of bags needs to be done in a proper format, stack the bags evenly against at least two supporting walls. Supported stacking should be used whenever possible to ensure the maximum amount of stability. The height of a stack of bags should not be more than 20 bags.

[#402] Mean sea surface temperature is
Correct Answer

(D) 23°C

Explanation

Solution: Sea surface temperature or ocean surface temperature is the water temperature close to the ocean's surface. The range of sea surface varies between 1 millimeter and 20 metres below the sea surface. The mean sea surface temperature is around 23°C, but our ranges from more than 30 degrees Celsius in warm tropical regions to less than zero degrees Celcius at high altitudes.

[#403] Which group of colloid have highest cation exchange capacity by volume basis
Correct Answer

(B) Vermiculite

Explanation

Solution: Vermiculite is a group of colloids that have the highest cation exchange capacity by volume basis. Vermiculite is a hydrous phyllosilicate mineral that undergoes significant expansion when heated. It is formed by the weathering or hydrothermal alteration of biotite or phlogopite. It helps to aerate the soil while simultaneously retaining water and nutrients.

[#404] The availability of P 2 O 5 is maximum at
Correct Answer

(C) Neutral

Explanation

Solution: The availability of P 2 O 5 is maximum at neutral pH. P 2 O 5 is listed as 'available phosphate'. The sum of the water-soluble and citrate-soluble phosphate is considered to be the amount of phosphate available to the plant and is the amount guaranteed on the fertilizer label. In acidic soil, phosphorus reacts with iron and aluminum and makes it unavailable to plants. Soil with inherent pH values between 6 - 7.5 is ideal for the availability of P 2 O 5 . Whereas pH values below 5.5 and between 7.5 - 8.5 limit phosphorus availability.

[#405] Major form of boron absorbed by plants is
Correct Answer

(D) $${{ ext{H}}_3}{ ext{B}}{{ ext{O}}_3}$$

Explanation

Solution: The major form of boron absorbed by plants is H 3 BO 3 (boric acid). Boron is an essential plant nutrient required by plants for its proper growth and functioning. It plays an important role in regulating plants' hormone levels and promoting proper growth. It increases flower production and retention, pollen tube elongation and germination, and seed and fruit development.