A) anaerobic photosynthesizers
B) anaerobic chemoheterotrophs
C) aerobic photosynthesizers
D) anaerobic heterotrophs
Correct Answer: C
Solution :
Aerobic photoautotrophs were develop about 3300-3500 million year ago as a result of accumulation of \[C{{O}_{2}}\]in atmosphere and formation of chlorophyll molecule in form of cyanobacteria (blue-green algae). These used water as hydrogen donor and \[C{{O}_{2}}\]as source of carbon in oxygenic photosynthesis. These were oxygen producing photo synthesizers.
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