Soil Science - Study Mode

[#836] Who isolated Bacillus radicicola, the organism responsible for N fixation in 1888
Correct Answer

(B) M. W. Beigerinck

Explanation

Solution: Bacillus radicicola is the organism responsible for Nitrogen fixation and was isolated by M. W. Beijerinck in 1888 . This bacteria was discovered as it produces root nodules for fixation. He observed the motile "swarmer" stage as well as the branching forms, that were developing the nodules for fixing atmospheric nitrogen.

[#837] The Law of Restitution was propounded by
Correct Answer

(B) Leibig

Explanation

Solution: The first law of Restitution was given by Leibig , which states that always restore the nutrients removed by the farming process, so as not to reduce the fertility of the soil. The main motive of this principle is to increase the profitability of crop production without deteriorating soil fertility and food quality.

[#838] Relative purity or strength of the spectral color of soil is
Correct Answer

(A) Hue

Explanation

Solution: The relative purity or strength of the spectral colour of soil is Hue . The concept of a colour system with a hue was explored as early as 1830, and Munsell's colour system was a great step forward in realizing perceptual uniformity. It is one of the main properties of a colour, which refers to the degree to which a stimulus can be described as similar to or different from stimuli that are described as red, orange, yellow, green, blue and violet (colour of vision).

[#839] Equivalent acidity of urea in
Correct Answer

(B) 80

Explanation

Solution: Equivalent acidity is defined as the acidity developed by a fertilizer when applied to soils, measured in terms of calcium carbonate required for its neutralization. Equivalent mass of acid or equivalent acidity = molecular mass of the acid/basicity. The equivalent acidity of urea is 80.

[#840] India depends completely on imports for its need of
Correct Answer

(B) Potash

Explanation

Solution: India depends completely on imports for its need for Potash. India imports more than 4 - 5 million tonnes of potash every year mostly from South Korea, Canada and Belarus. The top import market for potash is India in the world. Potash is a form of Potassium oxide, which is a vital nutrient of plants required throughout their life cycle. It helps them bear flowers and fruit also.