Select the correct statement .
Statements -I : Thermoacidophiles are obligate anaerobes and heterotrophs.
Statement -II They used elemental sulfur and product hydrogen sulfide .

Options

A. Statement-I is true and statement -II is false
B. Statements -II is true and statement - I is false
C. Both the statement -I and statement -II are false
D. Both the statements -I and statement II - are true

Answer

To solve the question, we need to evaluate the two statements provided about thermoacidophiles.

### Step-by-Step Solution:

1. **Understanding Thermoacidophiles**:
- Thermoacidophiles are a type of extremophilic microorganisms that thrive in high-temperature and highly acidic environments. They are typically found in places like hot springs and hydrothermal vents.

2. **Evaluating Statement I**:
- **Statement I**: "Thermoacidophiles are obligate anaerobes and heterotrophs."
- **Analysis**:
- Obligate anaerobes are organisms that cannot survive in the presence of oxygen.
- Heterotrophs are organisms that cannot produce their own food and must obtain it from other organic sources.
- Thermoacidophiles are indeed obligate anaerobes, as they thrive in environments devoid of oxygen. They also obtain energy from organic compounds (making them heterotrophs), such as sugars and peptides.
- **Conclusion**: Statement I is correct.

3. **Evaluating Statement II**:
- **Statement II**: "They used elemental sulfur and produce hydrogen sulfide."
- **Analysis**:
- Thermoacidophiles can utilize elemental sulfur as an energy source.
- During their metabolic processes, they can reduce sulfur to produce hydrogen sulfide (H2S).
- **Conclusion**: Statement II is also correct.

4. **Final Conclusion**:
- Since both statements are correct, the answer to the question is that both Statement I and Statement II are true.

### Final Answer:
Both statements are true.