Soil Science MCQ Question and Answer | Agriculture MCQ Question

The most dominant mineral in the earth's crust is Feldspar. It makes up about 60% of the Earth's crust and 41% of the Earth's continental crust by weight.
Feldspar is a group of rock-forming aluminum tectosilicate minerals, containing sodium, calcium, potassium, or barium. Silicon ions are linked by shared oxygen ions to form a three-dimensional network.

IIIite is the non-expanding 2 : 1 type mineral among the following given options.
Illite is a group of closely related non-expanding clay minerals. It is a secondary mineral precipitate and an example of a phyllosilicate, or layered alumino-silicate.
Its structure is a 2 : 1 sandwich of silica tetrahedron (T) - alumina octahedron (O) - silica tetrahedron (T) layers.

The fertility of male flowers is enhanced by Copper (Cu).
Copper act as a cofactor in many enzymes responsible for important processes in cells and is key to the formation of chlorophyll. It is an essential element for the production of male gametes and pollens in flowers. Although it is one of the micronutrients needed in very small quantities by plants.

The value of ESP in alkali soils is always greater than 15.
ESP is exchangeable sodium percentage, it measures the proportion of cation exchange sites occupied by sodium.
Soils are considered sodic when the ESP is greater than 6 and highly sodic when the ESP is greater than 15, thus alkali soils that are highly sodic with pH greater than 8.3 and ESP are always greater than 15.

CEC (cation exchange capability), is a measure of negatively charged sites on the surface, which help in holding positively charged ions and nutrients.
It is a calculated value that is an estimate of the soil's ability to attract, retain and exchange cation elements. It is reported in milliequivalents per 100 grams of soil (meq/100 g).
CEC of mica is 0 as the surface charge of clays varies from 0.11 to 0.20.

Plantation crop tea is grown in Forest loamy soil.
Tea bushes grow well in well-drained, deep, friable loamy soil which is found mostly over the hill slopes.
Tea plantation demands evenly distributed rainfall with no water logging issues. The hill slopes of the plantation provide easy drainage of the rainwater, hence preventing the conditions of water logging.

A Bushel is an imperial and US customary unit of volume based upon an earlier measure of dry capacity. It is most often used in agriculture.
1 Bushel = 8 gallons.
               = 32 quarts.
               = 35.24 litres.

AS is better than Urea on S-deficient soils, because it has Sulphuric acid.
Urea is a source of nitrogen, an essential nutrient crucial for crop growth and development. It is a widely used nitrogenous fertilizer because of its high N content is 46%.
AS is Ammonium Sulphate is a quick-acting acidic nitrogenous fertilizer. It is used for alkaline soils. It contains 21% nitrogen and 24% Sulphur.
AS is better than Urea on Sulphur deficient soils it produces sulphuric acid and releases a good amount of Sulphur into the soil.

Nitrification is an important step in the nitrogen cycle in soil.
Nitrification is the biological oxidation of ammonia to nitrite followed by the nitrite to nitrate occurring through separate organisms or direct ammonia oxidation to nitrate.
The step nitrification moves pH Lower. pH (near to neutral) controls nitrification rates.

The formative element ‘od’ stands for Spodosol.
Spodosol is denoted by ‘od’.
Mollisol is denoted by ‘all’.
Aridisol is denoted by ‘id’.
Oxisols are denoted by 'ox'
Spodosol is one of the 12 soil orders in the US soil taxonomy. These are ashy gray, acidic soils with a strongly leached surface layer. Their suitability for cultivation is limited to acid-tolerant crops and orchards, provided with sufficient lime and fertilizer.