Protons & electrons acceptors ( `H_2` acceptors) in the Z , scheme are

Options

A. Cytochromes, PC
B. PQ, `NADP^(+)`
C. Pheophytin
D. `H_(2)O`

Answer

### Step-by-Step Solution:

1. **Understanding the Z-Scheme**: The Z-scheme is a model that describes the light-dependent reactions of photosynthesis, specifically how electrons are transferred through various components in the thylakoid membranes of chloroplasts.

2. **Identifying the Photosystems**: In the Z-scheme, there are two main photosystems involved: Photosystem II (PSII) and Photosystem I (PSI). PSII is the first to be activated by light, followed by PSI.

3. **Electron and Proton Acceptors**: In the context of the Z-scheme, we need to identify the specific acceptors for electrons and protons (H2 acceptors).

4. **Role of Pheophytin**: Pheophytin is the primary electron acceptor for Photosystem II. It accepts electrons that are generated when chlorophyll absorbs light energy and splits water molecules.

5. **Conclusion**: Therefore, the correct answer to the question about the proton and electron acceptors (H2 acceptors) in the Z-scheme is **Pheophytin**.

### Final Answer:
The protons and electron acceptor (H2 acceptor) in the Z-scheme is **Pheophytin**.

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