Soil Science - Study Mode

[#771] Calcification of soil results in . . . . . . . . horizon.
Correct Answer

(B) B k

Explanation

Solution: Calcification is the soil process in which the surface soil is supplied with calcium. Calcification of soil occurs when evapotranspiration exceeds precipitation causing the upward movement of dissolved alkaline salts from the groundwater and at the same time, the movement of rainwater causes a downward movement of the salts, and hence the net result causes the deposition of the translocated cations in the B-horizon can be labeled as B k where B is the B horizon and K is referred to an accumulation of carbonates.

[#772] Which of the following is a biofertilizer?
Correct Answer

(A) Green algae

Explanation

Solution: Fertilizer is the supplement added to the soil and plants to fulfill the nutrient deficiency in any plant and increase the fertility of the soil, it is usually a chemical supplement Whereas, Biofertilizers are living microbes that enhance plant nutrition by either mobilizing or increasing nutrient availability in soils. Here, Green algae are the Biofertilizer used to increase yield and soil fertility and are mostly used in Rice fields.

[#773] If we add 24.5g H 2 SO 4 in 500 mL water, its normality will be
Correct Answer

(C) 1 N

Explanation

Solution: Normality is any solution is the number of gram or mole equivalents of solute present in one litre of a solution. Normality = Molarity × Basicity or Acidity of the solution. The molecular weight of sulphuric acid is 98.079. As 24.5 g of H 2 SO 4 is added to 500 ml of water, Hence, on calculation Molarity of the diluted Sulphuric acid solution = 0.524 M Normality = 0.5 × 2 [(SO 4 ) -2 has 2 Hydrogen ions] = 1 N

[#774] Crop logging developed by CF Clement is carried out for sugarcane in
Correct Answer

(B) Hawaii

Explanation

Solution: Crop logging is a system of monitoring the nutritional status of plants by periodic and regular sampling and analysis of soil and plant parts. The main aim is to overcome the nutritional problem while the plant is still standing and can benefit from the corrective measures. This system was discovered by H. Clements for growing Sugarcane in Hawaii.

[#775] Mitscherlich factor for phosphorus is
Correct Answer

(D) 0.6

Explanation

Solution: The equation introduced by Mitscherlich has been generally used to express nutrient-yield relationships as follows: $${x08f{y = A}}left( {{x08f{1 - }}{{x08f{e}}^{{x08f{ - eb - ex}}}}}
ight).$$ The classical Mitscherlich equation is based on Leibig’s Law of the Minimum and describes the yield response of a crop to an increase in the main factor that is limiting growth. Mitscherlich's factor for phosphorus is 0.6.