Soil Science - Study Mode

[#516] The common method of determining soluble sodium (Na) in soil is
Correct Answer

(A) Flame photometric

Explanation

Solution: The common method of determining soluble sodium in the soil is Flame photometric . Flame photometry is also known as Flame emission spectrometry (FES) and it is an atomic optical emission spectroscopy technique that uses the flame as the source of atoms excitation. Flame photometry is highly empirical, in comparison to an absolute, method of analysis such as gravimetry. Sodium gives yellow flame in flame photometry.

[#517] Match the following columns: Column I (Fertilisers) Column II (P 2 O 5 content %) a. SSP 1. 40 - 48 b. TSP 2. 16 - 20 c. DAP 3. 20 - 30 d. Rock phosphate 4. 54
Correct Answer

(A) a-2, b-1, c-4, d-3

Explanation

Solution: SSP (Single Super Phosphate) is the most popular phosphatic fertilizer. The percentage of P 2 O 5 is approximately 16 - 20% in SSP. TSP (Triple Super Phosphate), is a chemical fertilizer with a P 2 O 5 content of over 40 - 48%. DAP (Diammonium Phosphate) is the widely used phosphate-based fertilizer with a phosphorus content of 54%. Rock phosphate is the phosphorite, is mined from clay deposits that contain phosphorus and is used to make organic phosphate fertilizers that many gardeners utilize. It contains 20 - 30% of P 2 O 5 .

[#518] Nitrate can be absorbed by roots as it can be lost by
Correct Answer

(B) Leaching

Explanation

Solution: Nitrate can be absorbed by roots as it can be lost by the process of Leaching . Nitrogen can be lost from agricultural lands through soil erosion and runoff. Leaching is the loss of water-soluble plant nutrients from the soil or applying a small amount of excess irrigation to avoid salinity.

[#519] Example of a denitrifying bacteria which is as well as a Sulphur oxidizer
Correct Answer

(D) Thiobacillus

Explanation

Solution: Thiobacillus is one of the denitrifying bacteria which is as well as a Sulphur oxidizer. Denitrifying bacteria are the group of microorganisms whose action results in the conversion of nitrates in the soil to free atmospheric nitrogen. And suphur oxidizers are the microorganisms that produce reduced Sulphur compounds formed as a product of anaerobic heterotrophic respiration with sulphate.

[#520] 'Percent Yield Concept' is given by
Correct Answer

(A) Baule

Explanation

Solution: Percent yield is the percent ratio of actual yield to the theoretical yield. This concept is given by “Baule”. It is calculated as the experimental yield divided by the theoretical yield multiplied by 100%. In the case where actual yield and theoretical yield are the same, the percent yield is 100%.