Soil Science - Study Mode

[#781] Rock phosphate is a suitable fertiliser for soils which are
Correct Answer

(A) Acidic

Explanation

Solution: Phosphorite or rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate minerals. The phosphate content of phosphorite varies from 4 - 20% phosphorous pentaoxide. Rock phosphate is a natural source of phosphorous and is suitable fertilizer for soils that are Acidic as low pH helps to solubilize the rock phosphate and increases the available form of P to the plants.

[#782] Which crop can deplete maximum micro-nutrients from soil?
Correct Answer

(B) Maize

Explanation

Solution: Maize is a crop that can deplete maximum micro-nutrients from the soil. Soil nutrient depletion can be attributed to insufficient fertilizer use, unbalanced fertilization, and nutrient depletion-induced soil fertility problems. Growing corn uses a lot of water and fertilizer, especially nitrogen and phosphorus and some of these production techniques, are coupled with the effects of climate change.

[#783] pH of cell sap is maintained by
Correct Answer

(B) Ca

Explanation

Solution: The pH of cell sap is maintained by Calcium (Ca). It is related to differences in cation and anion absorption. The relative proportion of calcium ions to calcium also varies, with organic acids, such as malate and citrate, chelating calcium ions in xylem sap. Cell sap is a fluid found in the vacuoles (small cavities) of the living cell. It contains variable amounts of food and waste materials, inorganic salts and nitrogenous compounds. The pH of cell sap is around 5.5 thus these are acidic.

[#784] Which one is dominating salt in alkali soil
Correct Answer

(D) Na 2 CO 3

Explanation

Solution: Na 2 CO 3 is the dominating salt among the given options in alkali soil. Alkali soils owe their unfavorable physio-chemical properties mainly to the dominating presence of sodium carbonate, which causes the soil to swell and difficult to clarify and settle. Alkali soils are clay soils with high pH, a poor soil structure and a low infiltration capacity. They have a hard calcareous layer at 0.5 to 1 meter depth.

[#785] Munsell colour chart contains about . . . . . . . . different coloured papers or chips
Correct Answer

(A) 175

Explanation

Solution: Munsell colour system is a colour space that specifies colours based on three properties of colour: hue (basic colour), chroma (colour intensity), and value (lightness). It was created by Professor Albert H. Munsell in the 20 th century and adopted by the United States Department of Agriculture as the official colour system for soil research in the 1930s. Munsell's colour chart contains about 175 different coloured papers or chips.