Question

Which one of the following is detrimental to soil fertility?

(a) Saprophytic bacteria

(b) Nitrosomonas

(c) Nitrobacter

(d) Pseudomonas

Answer 1

Answer is : (d) Pseudomonas

Pseudomonas is denitrifying bacteria. Denitrifying bacteria are microorganisms whose action results in the conversion of nitrates in soil to free atmospheric nitrogen, thus depleting soil fertility and reducing agricultural productivity.