List of top Physical Sciences Questions on Soil Microbiology

Microorganisms that oxidise ammonia to nitrite
(A). Nitrosomonas
(B). Thiobacillus
(C). Nitrobacter
(D). Nitrosolobus

Choose the correct answer from the options given below:

Given below are two statements:

Statement (I): Nitrobacteria are obligate autotrophic aerobes
Statement (II): Nitrate will not be produced from $\text{NH}_4^+$ in the absence of oxygen

In light of the above statements, choose the most appropriate answer from the options given below.

Humic substances are composed of
(A). Phenols
(B). Quinones
(C). Carboxylic acid
(D). Fatty acid

Choose the correct answer from the options given below:

Who first observed that legumes can utilize atmospheric nitrogen?

Which of the following is/are the example of nitrifying bacteria?

Which of the following group of compounds is produced by Streptomyces hygroscopicus ?

Given below are two statements, one is labeled as Assertion (A) and the other one is labeled as Reason (R).
Assertion (A) : Bacillus megaterium is an efficient P-solubilizing bacteria.
Reason (R) : Bacillus megaterium produces different organic acids for dissolution.
In light of the above statements, choose the correct answer from the options given below.

Given below are two statements, one is labeled as Assertion (A) and the other one is labeled as Reason (R).
Assertion (A) : Humic acids are more resistant than fulvic acid.
Reason (R) : Humic acids have low molecular weight and simple structure than fulvic acids.
In light of the above statements, choose the correct answer from the options given below.

Which of the following theories are associated with humus formation ?
(A) Polyphenol theory
(B) Linin-protein theory
(C) Chemiosmosis theory
(D) Sugar-amine condensation theory