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Evaluation · Q7

Q.Which of the following is not involved in nitrogen fixation?

a) Pseudomonas
b) Azotobacter
c) Anabaena
d) Nostac
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Step 1. Nitrogen-fixing organisms named in this chapter's biofertiliser section include Azotobacter and Azospirillum (free-living bacteria) and the cyanobacteria Anabaena and Nostoc (printed as 'Nostac' in the option).

Step 2. Pseudomonas, by contrast, appears in this chapter as a genus associated with bioremediation (e.g. Pseudomonas putida degrading hydrocarbons in oil spills), not with nitrogen fixation. …

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