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 will analyze each option provided and determine their presence in the stroma lamellae of chloroplasts.

### Step-by-Step Solution:

1. **Understand the Components**:
- We have four options to consider:
1. PS II complex (Photosystem II)
2. PS I complex (Photosystem I)
3. NADP reductase
4. Both A and C

2. **Identify the Location of Photosystems**:
- Photosystem II (PS II) is primarily located in the grana of the chloroplasts.
- Photosystem I (PS I) is found in the stroma of the thylakoids.

3. **Determine the Presence of NADP Reductase**:
- NADP reductase is an enzyme that facilitates the reduction of NADP to NADPH, which occurs in conjunction with the photosystems.
- NADP reductase is also not present in the stroma lamellae.

4. **Evaluate Each Option**:
- **Option 1 (PS II complex)**: Not found in stroma lamellae (present in grana).
- **Option 2 (PS I complex)**: Found in the stroma of thylakoids (therefore, present).
- **Option 3 (NADP reductase)**: Not found in stroma lamellae.
- **Option 4 (Both A and C)**: Since both PS II complex and NADP reductase are not found in the stroma lamellae, this option is correct.

5. **Conclusion**:
- The components of phosphorylation that are not found in the stroma lamellae are both PS II complex and NADP reductase. Therefore, the correct answer is **Option 4: Both A and C**.