MCQ
Which of the following can use molecular nitrogen as nutrient?
- AMethanomonas
- BMucor
- CRhizobium
- DSpirogyra
Explanation:
Rhizobium fixes the nitrogen symbiotically. The nitrogen-fixing bacteria enter the roots and lead to the incessant growth of the cortical cells which form nodules that act as a primary site for the nitrogen fixation. The enzyme nitrogenase is primarily used for the conversion of molecular nitrogen.
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$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?