According to modern scheme of photosynthetic electron transport the correct sequence of electron transfer from excited 9700 to NADP + is

Options

A. `A_(1) rarr A_(0) rarr F_(x) rarr F_(A)//F_(B) rarr Fd rarr NADP^(+)`
B. `A_(1) rarr A_(0) rarr F_(A) //F_(B) rarr Fx rarr FNR rarr NADP^(+)`
C. `A_(0) rarr A_(1) rarr F_(A) //F_(B) rarr Fx rarr NADP`
D. `A_(0) rarr A_(1) rarr Fx rarr F_(A) //F_(B) rarr Fd rarr NADP^(+)`

Answer

To solve the question regarding the correct sequence of electron transfer from excited P700 to NADP+ in the photosynthetic electron transport chain (also known as the Z-scheme), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Components**:
- The process starts with P700, which is a chlorophyll molecule located in Photosystem I (PSI). When light energy is absorbed, it excites electrons in P700.

2. **Excitation of Electrons**:
- The excited electrons from P700 are transferred to a primary electron acceptor, which is referred to as A0 (or A1 in some contexts).

3. **Electron Transfer Sequence**:
- After A0, the electrons move to A1.
- From A1, the electrons are transferred to a series of proteins and cofactors, including:
- FX (Fe-S protein)
- FA and FB (iron-sulfur proteins)
- Fd (ferredoxin)

4. **Final Electron Acceptor**:
- The electrons ultimately reach NADP+, where they are used to reduce NADP+ to NADPH, which is crucial for the Calvin cycle in photosynthesis.

5. **Identifying the Correct Sequence**:
- Based on the above steps, the correct sequence of electron transfer from excited P700 to NADP+ can be summarized as:
- P700 → A0 → A1 → FX → FA/FB → Fd → NADP+

6. **Choosing the Correct Option**:
- From the provided options, we need to find the one that matches the sequence identified. The correct option will start with P700 and follow the sequence outlined above.

### Conclusion:
The correct sequence of electron transfer from excited P700 to NADP+ is:
**P700 → A0 → A1 → FX → FA/FB → Fd → NADP+**