What is the main role of bacteria?
Correct answer: D. All of the above
- A. CO2 cycle
- B. Nitrogen cycle
- C. Phosphorus cycle
- D. All of the above
Explanation
Bacteria are indispensable in various biogeochemical cycles. In the carbon cycle, they decompose organic matter, releasing carbon dioxide. In the nitrogen cycle, they perform nitrogen fixation, ammonification, and denitrification, all crucial for nitrogen availability. In the phosphorus cycle, they transform phosphorus into forms usable by plants. Therefore, the correct answer is 'All of the above' as bacteria contribute to all these cycles significantly. The other options are too narrow, focusing on only one specific role.
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