In the chloroplast, the stroma lamellae lack the

Options

A. PS I , NADP reductase
B. PS II, PS I
C. NADP reductase , enzyme, `P_(700)`
D. NADP, reductase , PS II

Answer

To answer the question "In the chloroplast, the stroma lamellae lack the...", we need to analyze the structure and function of chloroplasts, particularly focusing on the stroma lamellae and its components.

### Step-by-Step Solution:

1. **Understanding Chloroplast Structure**:
- Chloroplasts are organelles found in plant cells that are responsible for photosynthesis. They contain chlorophyll, which gives plants their green color.
- Chloroplasts have a double membrane structure and are composed of thylakoids, stroma, and stroma lamellae.

2. **Identifying Thylakoids and Stroma Lamellae**:
- Thylakoids are membrane-bound structures where the light-dependent reactions of photosynthesis occur. They are often stacked in structures called grana.
- Stroma lamellae are the flat, membranous structures that connect different thylakoids and are located in the stroma, which is the fluid-filled space surrounding the thylakoids.

3. **Photosystems and NADP Reductase**:
- The light-dependent reactions involve two photosystems: Photosystem I (PSI) and Photosystem II (PSII).
- NADP reductase is an enzyme that facilitates the reduction of NADP+ to NADPH during the light reactions.

4. **Function of Stroma Lamellae**:
- The stroma lamellae primarily serve as a connection between thylakoids and do not participate in the light reactions directly.
- The light reactions occur in the thylakoids, where both photosystems and NADP reductase are present.

5. **Conclusion**:
- Since the stroma lamellae do not contain the components necessary for the light-dependent reactions (such as Photosystem II and NADP reductase), we conclude that the stroma lamellae lack these components.
- Therefore, the correct answer is that the stroma lamellae lack **Photosystem II**.

### Final Answer:
In the chloroplast, the stroma lamellae lack **Photosystem II**.

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