Chemoautotrophs make use of

Options

A. organic compounds as a source of carbon.
B. carbon dioxide as a source of carbon
C. bacteriochlorophyll
D. chlorophyll

Answer

**Step-by-Step Solution:**

1. **Understanding Chemoautotrophs**: Chemoautotrophs are organisms that obtain their energy through the oxidation of inorganic compounds. They do not rely on sunlight (like photoautotrophs) for energy.

2. **Energy Source**: These organisms utilize chemical reactions involving inorganic substances to generate energy. This energy is then used to convert carbon dioxide into organic compounds.

3. **Carbon Source**: Chemoautotrophs use carbon dioxide (CO2) as their primary source of carbon. This is a key characteristic that distinguishes them from other types of autotrophs that may use organic compounds for carbon.

4. **Conclusion**: Based on the information about how chemoautotrophs obtain energy and carbon, the correct answer to the question is that chemoautotrophs make use of carbon dioxide as a source of carbon.

5. **Final Answer**: The answer is option B: Carbon dioxide as a source of carbon.

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