Multiple Choice Question Answer XI — task. Science CBSE, Class 9.

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1. \(CO_2\) and \(O_2\) balance is atmosphere is due to :-

Photorespiration
Photosynthesis
Respiration
Leaf anatomy

2. Role of bacteria in the carbon cycle is __________

Chemosynthesis
Photosynthesis
Breakdown of organic compounds
Assimilation of nitrogen compounds

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