Which of the following is true regarding chemoautotrophs ?

Options

A. Bacteria oxidise various inorganic substance only for food production.
B. They use chemical energy for food synthesis
C. They use light energy for food production
D. Both (1) & (2)

Answer

To answer the question regarding which statements are true about chemoautotrophs, we can break down the information step by step:

### Step-by-Step Solution:

1. **Definition of Chemoautotrophs**:
- Chemoautotrophs are organisms that obtain their energy through the oxidation of inorganic substances. They use this energy to convert carbon dioxide (CO2) into organic compounds.

2. **Statement Analysis**:
- **Statement 1**: "Bacteria oxidise various inorganic substances only for food production."
- This statement is true. Chemoautotrophs, such as certain bacteria, indeed oxidize inorganic substances (like sulfur, iron, or ammonia) to obtain energy for food production.

- **Statement 2**: "They use chemical energy for food synthesis."
- This statement is also true. Chemoautotrophs utilize the chemical energy released from the oxidation of inorganic compounds to synthesize their food.

- **Statement 3**: "They use light energy for food production."
- This statement is false. Chemoautotrophs do not rely on light energy; instead, they depend on chemical energy from inorganic substances. This characteristic distinguishes them from photoautotrophs, which do use light energy.

3. **Conclusion**:
- Based on the analysis, the correct statements regarding chemoautotrophs are:
- Statement 1: True
- Statement 2: True
- Statement 3: False
- Therefore, the correct answer is that both statements 1 and 2 are true.

### Final Answer:
Both statements 1 and 2 are correct regarding chemoautotrophs.

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