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Question

The main role of bacteria in the carbon cycle involves

A
Assimilation of nitrogenous compounds
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B
Photosynthesis
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C
Chemosynthesis
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D
Digestion or breakdown of organic compounds
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Solution

The correct option is D Digestion or breakdown of organic compounds
Carbon is a component of all organic compounds of protoplasm like carbohydrates, lipids, proteins, etc. It constitutes 49% of dry weight of organisms and is next only to water in abundance. Carbon cycling occurs through atmosphere, ocean and through living and dead organisms. Bacteria also play a very important role in carbon cycle. Decomposers contribute substantially to CO2 pool by their processing of waste materials and dead organic matter of land or oceans. The main role of bacteria in the carbon cycle involves digestion or breakdown of these waste organic compounds.

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