Majority of bacteria are

Options

A. Photoautotrophs
B. Chemoautotrophs
C. Photoheterotrophs
D. Chemoheterotrophs

Answer

**Step-by-Step Text Solution:**

1. **Understanding Bacteria**: Bacteria are classified as prokaryotic organisms, meaning they lack a defined nucleus and membrane-bound organelles. They belong to the kingdom Monera.

2. **Nutritional Modes**: Bacteria can be categorized based on their nutritional modes. The primary types include:
- Autotrophs: Organisms that produce their own food.
- Heterotrophs: Organisms that rely on other organic substances for nutrition.
- Chemoautotrophs: A specific type of autotroph that derives energy from the oxidation of inorganic compounds.

3. **Majority of Bacteria**: Among these categories, the majority of bacteria are classified as chemoautotrophs. These organisms oxidize inorganic chemical substances to obtain energy and use carbon dioxide as their primary source of carbon.

4. **Evaluating Options**: Given the options:
- Option A: Phototrophs (incorrect)
- Option B: Chemoautotrophs (correct)
- Option C: Photoautotrophs (incorrect)
- Option D: Chemoheterotrophs (incorrect)

5. **Conclusion**: The correct answer is Option B, which states that the majority of bacteria are chemoautotrophs.

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