The electron transport chain of photosynthetic process is

Options

A. In the stroma of the chloroplast
B. Bound to the thylakoid membranes
C. Present in the outer membrane of the chloroplast
D. Present in mitochondria

Answer

To answer the question regarding the electron transport chain (ETC) in the photosynthetic process, we will analyze the options provided and determine the correct location of the ETC in chloroplasts.

### Step-by-Step Solution:

1. **Understanding the Electron Transport Chain (ETC)**:
- The ETC is a series of protein complexes and other molecules that transfer electrons from electron donors to electron acceptors via redox reactions. In photosynthesis, this process occurs in the thylakoid membranes of chloroplasts during the light-dependent reactions.

2. **Analyzing the Options**:
- **Option A: In the stroma of the chloroplast**:
- This option is incorrect. The stroma is the fluid-filled space surrounding the thylakoids, where the Calvin cycle occurs, but it does not contain the ETC.

- **Option B: Bound to the thylakoid membrane**:
- This option is correct. The ETC is located in the thylakoid membranes, where it plays a crucial role in the light-dependent reactions of photosynthesis, helping to convert light energy into chemical energy.

- **Option C: Present in the outer membrane of the chloroplast**:
- This option is incorrect. The outer membrane does not contain the ETC; it serves as a barrier and is not involved in the photosynthetic process.

- **Option D: Present in mitochondria**:
- This option is also incorrect in the context of photosynthesis. While mitochondria do have their own ETC for cellular respiration, it is not part of the photosynthetic process.

3. **Conclusion**:
- Based on the analysis, the electron transport chain of the photosynthetic process is **bound to the thylakoid membrane**. Therefore, the correct answer is **Option B**.