Discussion
Which aerobic photosynthetic prokaryote has heterocysts to fix nitrogen in acquatic system ?
Answer: A
The prokaryote is the cyanobacteria (printed 'Cynobacteria').
Cyanobacteria carry out oxygen-producing photosynthesis like plants, and filamentous forms such as Anabaena and Nostoc develop heterocysts: thick-walled cells that lack the oxygen-evolving photosystem, so the oxygen-sensitive enzyme nitrogenase can work inside them. They are major nitrogen fixers in water and in rice paddies.
Green sulphur bacteria photosynthesize anaerobically and have no heterocysts. Frankia fixes nitrogen in vesicles and is not photosynthetic. Algae are eukaryotes, not prokaryotes.
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