During the light dependent reactions of photosynthesis (photophosphorylation) light energy is converted to the chemical energy through the process of chemiosmosis in the chloroplast. Which of the following statement is false?

Options

A. The electron carriers of photophosphorylation are located in the thylakoid membrane of the chloroplast
B. Protons diffuse through protein channel ,which are ATP synthase molecule
C. During photophosphorylation, the chloroplast stroma become more acidic than the interior of the thylakoid membrane
D. ATP is synthesised from ADP and Pi on the stroma side of the thylakoid membrane in chloroplast

Answer

To determine which statement is false regarding the light-dependent reactions of photosynthesis, we need to analyze the provided statements based on our understanding of the process of photophosphorylation and chemiosmosis in chloroplasts.

### Step-by-Step Solution:

1. **Understanding Light-Dependent Reactions**:
- The light-dependent reactions occur in the thylakoid membranes of chloroplasts where light energy is converted into chemical energy.

2. **Role of Electron Carriers**:
- Electron carriers are indeed located in the thylakoid membrane. They facilitate the transfer of electrons through the electron transport chain.

3. **Proton Diffusion**:
- Protons (H⁺ ions) do diffuse through ATP synthase, which acts as a channel. This diffusion is crucial for ATP synthesis.

4. **Formation of Proton Gradient**:
- During the light-dependent reactions, a proton gradient is established across the thylakoid membrane. The stroma becomes more alkaline (less acidic) compared to the thylakoid lumen, where protons accumulate.

5. **ATP Synthesis**:
- ATP is synthesized when protons flow back into the stroma through ATP synthase, combining ADP and inorganic phosphate (Pi) to form ATP.

6. **Evaluating Statements**:
- Now, we need to evaluate the statements provided to identify which one is false.
- If a statement claims that the stroma becomes more acidic during photophosphorylation, this would be incorrect since the stroma becomes more alkaline due to the accumulation of protons in the thylakoid lumen.

### Conclusion:
- The false statement is that "the chloroplast's stroma becomes more acidic than the interior of the thylakoid membrane." This is incorrect because the stroma becomes more alkaline as protons are concentrated in the thylakoid lumen.

### Answer:
The false statement is: "The chloroplast's stroma becomes more acidic than the interior of the thylakoid membrane."

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