A) Gram positive heterotrophs
B) Gram negative photosynthetic cyanobacteria
C) chemoautotrophic bacteria
D) photoautotrophic bacteria
Correct Answer: B
Solution :
Cyanobacteria (blue-green algae) are most successful group of organisms on the earth. These are ubiquitous in distribution, primarily freshwater, quite common on moist rocks or soils, forming a blackish crust when dried out. Some blue-green algae are nicely adapted to grow at extremes of temperature.
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