The ultimate hydrogen acceptor and hydrogen donor, respectively in the photosynthesis of higher plants

Options

A. Ferredoxin in `NADP^(+)`
B. ` NADP^(+)` and water
C. NADPH and OEC
D. PS II PS I

Answer

To answer the question regarding the ultimate hydrogen acceptor and hydrogen donor in the photosynthesis of higher plants, we can break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The **hydrogen donor** is the substance that provides hydrogen ions (H⁺) during the photosynthesis process.
- The **hydrogen acceptor** is the substance that accepts these hydrogen ions.

2. **Identifying the Hydrogen Donor**:
- In photosynthesis, water (H₂O) is the primary hydrogen donor.
- During the light reactions of photosynthesis, water undergoes a process called photolysis, where it splits into hydrogen ions (H⁺), electrons (e⁻), and oxygen (O₂).

3. **Identifying the Hydrogen Acceptor**:
- The ultimate hydrogen acceptor in photosynthesis is NADP⁺ (Nicotinamide adenine dinucleotide phosphate).
- NADP⁺ accepts the hydrogen ions (H⁺) produced from the splitting of water, reducing to form NADPH.

4. **Evaluating the Options**:
- Option A: Paradox in NADP⁺ - Incorrect, as it does not specify the correct donor or acceptor.
- Option B: NADP⁺ and water - Correct, as NADP⁺ is the acceptor and water is the donor.
- Option C: NADPH and OEC - Incorrect, as NADPH is not a donor and OEC (Oxygen Evolving Complex) is not the ultimate acceptor.
- Option D: PS2 and PS1 - Incorrect, as these are photosystems involved in light harvesting and not the donor or acceptor.

5. **Conclusion**:
- The correct answer is **Option B: NADP⁺ and water**. NADP⁺ is the ultimate hydrogen acceptor, and water is the hydrogen donor in the photosynthesis of higher plants.