Electron carriers involved in photophosphorylation are located in

Options

A. Outer chloroplast membrane
B. Inner chloroplast membrane
C. Stroma
D. Thylakoid membranes.

Answer

To solve the question regarding the location of electron carriers involved in photophosphorylation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Photophosphorylation**:
- Photophosphorylation is the process of synthesizing ATP in the presence of light. The term "photo" refers to light, and "phosphorylation" refers to the addition of a phosphate group to ADP to form ATP.

2. **Role of Light**:
- Light energy is absorbed by chlorophyll, which excites electrons. These excited electrons are crucial for the process of photophosphorylation.

3. **Electron Carriers**:
- The excited electrons are transferred to electron carriers. These carriers are essential for the transport of electrons during the light-dependent reactions of photosynthesis.

4. **Location of Electron Carriers**:
- The electron carriers involved in photophosphorylation are located in the thylakoid membrane of the chloroplast.
- The thylakoid membrane contains photosystems (Photosystem I and Photosystem II) and the electron transport chain, which are responsible for capturing light energy and facilitating the transfer of electrons.

5. **Evaluate Options**:
- The question provides four options:
- A) Outer chloroplast membrane
- B) Inner chloroplast membrane
- C) Stroma
- D) Thylakoid membrane
- Based on our understanding, the correct answer is D) Thylakoid membrane, as this is where the electron carriers are located.

### Final Answer:
The electron carriers involved in photophosphorylation are located in the **thylakoid membrane**.

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