Which of the following components of phosphorylation are not found in the stroma lamellae ?

Options

A. PS II complex
B. PS I complex
C. NADP reductase
D. Both (A) and (C)

Answer

To solve the question, "Which of the following components of phosphorylation are not found in the stroma lamellae?", we need to analyze the options provided and understand the components involved in the process of photosynthesis, particularly in the context of the thylakoid membranes and stroma lamellae of chloroplasts.

### Step-by-Step Solution:

1. **Understanding Stroma Lamellae**:
- Stroma lamellae are the regions of the chloroplast that connect the thylakoid stacks (grana). They play a role in the light-dependent reactions of photosynthesis.

2. **Identifying the Components**:
- **Photosystem II (PS II)**: This complex is primarily located in the thylakoid membranes and is involved in the initial stages of photosynthesis, particularly in the splitting of water and the generation of oxygen.
- **Photosystem I (PS I)**: This complex is also located in the thylakoid membranes but is found in both the grana and the stroma lamellae. It plays a role in the reduction of NADP+ to NADPH.
- **NADP Reductase**: This enzyme is responsible for the final step of the light reactions, where NADP+ is reduced to NADPH. It is typically associated with Photosystem I and is also found in the thylakoid membranes.

3. **Analyzing the Options**:
- **Option A (Photosystem II complex)**: Not found in the stroma lamellae; it is located in the thylakoid membranes.
- **Option B (Photosystem I complex)**: Found in the stroma lamellae.
- **Option C (NADP reductase)**: Not found in the stroma lamellae; it is associated with Photosystem I in the thylakoid membranes.
- **Option D (Both A and C)**: This option suggests that both Photosystem II and NADP reductase are not found in the stroma lamellae.

4. **Conclusion**:
- Since both Photosystem II and NADP reductase are not present in the stroma lamellae, the correct answer is **Option D (Both A and C)**.

### Final Answer:
**Option D (Both A and C)**

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