In the bacterical photosynthesis, hydrogen donor is

Options

A. `H_(2)S`
B. `H_(2)O`
C. `NH_(3)`
D. `H_(2)SO_(3)`.

Answer

**Step-by-Step Solution:**

1. **Understanding Bacterial Photosynthesis:**
- Bacterial photosynthesis is a process similar to that of higher plants, where certain bacteria can convert light energy into chemical energy.
- This process involves the absorption of carbon dioxide (CO2) and the release of a byproduct.

2. **Identifying the Hydrogen Donor:**
- In photosynthesis, a hydrogen donor is a substance that provides hydrogen ions (H+) for the formation of organic compounds.
- In higher plants, water (H2O) is the primary hydrogen donor, leading to the release of oxygen (O2).

3. **Examining the Options:**
- The question provides four options for the hydrogen donor in bacterial photosynthesis:
- Option 1: H2S (Hydrogen Sulfide)
- Option 2: H2O (Water)
- Option 3: NH3 (Ammonia)
- Option 4: H2SO4 (Sulfuric Acid)

4. **Determining the Correct Answer:**
- In bacterial photosynthesis, particularly in certain types of bacteria, hydrogen sulfide (H2S) acts as the hydrogen donor.
- When H2S is used, elemental sulfur is released instead of oxygen, which is a key difference from plant photosynthesis.

5. **Conclusion:**
- Based on the information gathered, the correct answer to the question is that in bacterial photosynthesis, the hydrogen donor is **H2S (Hydrogen Sulfide)**.

**Final Answer:**
- The hydrogen donor in bacterial photosynthesis is **H2S (Hydrogen Sulfide)**.

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