Microbes In Human Welfare Question 48
Question: Which of the following is common to Azospirillum, Azotobacter, Anabaena, Nostoc and Oscillatoria?
Options:
A) Prokaryotes are single-celled organisms that lack a nucleus and other membrane-bound organelles. They include bacteria and archaea.
B) $ N_2 $-fixers
C) Both [a] and [b] are correct.
D) Eukaryotes are organisms whose cells contain a nucleus enclosed within membranes.
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Answer:
Correct Answer: C
Solution:
As the following examples of bacteria are anaerobic bacteria, they survive in the absence of oxygen.
Azospirillum, Anabaena, Nostoc and Oscillatoria are all nitrogen fixing bio fertilizers. They are all prokaryotes except Oscillatoria, which is a eukaryote.
Azospirillum are free living bacteria whereas Anabaena, Nostoc and Oscillatoria are cyanobacteria.
BETA
