The thylakoid membrane contains

Options

A. oxysomes
B. structurally distinct photosystems
C. both (1) & (2)
D. enzymes of dark reaction

Answer

### Step-by-Step Solution:

1. **Identify the Location of Thylakoids**:
- Thylakoids are located inside the chloroplasts, which are the sites of photosynthesis in plant cells.

2. **Understand the Structure of Chloroplasts**:
- Chloroplasts have a double membrane structure. Within the chloroplasts, thylakoids are organized into stacks called granum (plural: grana).

3. **Define Thylakoid Membrane**:
- The thylakoid membrane is the membrane that surrounds the thylakoids. It plays a crucial role in the light-dependent reactions of photosynthesis.

4. **Identify Components of Thylakoid Membrane**:
- The thylakoid membrane contains photosystems, specifically Photosystem I (P700) and Photosystem II (P680). These photosystems are essential for capturing light energy and converting it into chemical energy.

5. **Differentiate Between Light and Dark Reactions**:
- The light reactions occur in the thylakoid membrane, where light energy is converted into ATP and NADPH. The dark reactions (Calvin Cycle) occur in the stroma, the fluid-filled space surrounding the thylakoids, where the ATP and NADPH produced in the light reactions are used to synthesize glucose.

6. **Conclude the Answer**:
- Therefore, the thylakoid membrane contains structurally distinct photosystems, namely P700 and P680, which are crucial for the process of photosynthesis.

### Final Answer:
The thylakoid membrane contains structurally distinct photosystems, specifically P700 and P680.

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