Soil Science - Study Mode

[#561] Biogas contain . . . . . . . . % of N.
Correct Answer

(D) 4 - 5

Explanation

Solution: Biogas is a mixture of gases, consisting of methane, carbon dioxide and hydrogen sulphide. The raw materials used for the formation of this gas are agricultural waste, manure, municipal waste, plant material, sewage, green waste and food waste. Biogas is a renewable source of energy and it contains 4 - 5% of Nitrogen.

[#562] C-axis spacing of illite is
Correct Answer

(B) 100 nm

Explanation

Solution: IIIite is a group of closely related non-expanding clay minerals. It is a secondary mineral precipitate and its structure is a 2 : 1 sandwich of silica tetrahedron-alumina octahedron-silica tetrahedron layers. C-axis spacing of illite is $${x08f{100 ,nm ,or, 10}}mathop {x08f{,A}}limits^{x08f{O}} {x08f{.}}$$

[#563] . . . . . . . . toxicity is probably the important growth limiting factor in acid soils, particularly when pH < 5.0 to 5.5
Correct Answer

(C) Aluminium

Explanation

Solution: Aluminium toxicity is probably the important growth limiting factor in acid soils, particularly when pH is less than 5 to 5.5. Strongly acidic soils have high concentrations of soluble aluminium. Iron and manganese may be toxic to the growth of some plants. Soil acidity ultimately limits crop production.

[#564] Passive factor of soil formation includes
Correct Answer

(C) Parent material

Explanation

Solution: The two main factors responsible for the formation of soil are active and passive. The active factors are climate and organisms whereas the parent material, topography and time are the passive factors. Parent material is the underlying geological material in which the horizons of soil are formed.

[#565] Indicator plant for monitoring K-deficiency is
Correct Answer

(C) Potato

Explanation

Solution: Potassium is a very important element and plays a vital role in the growth and development of plants. However, the deficiency of potassium leads to wilt on dry, sunny days and deficient plants will have a stocky appearance with short internodes. Some indicator plants indicate the deficiency of certain nutrients like potato, banana and cotton are indicator plants for monitoring K-deficiency.