Read the given statements and select the correct option.
Statement 1: In photosyntheis, during ATP synthesis, protons accumulate in the lumen of thylakoid.
Statement 2: In respiration, during ATP synthesis protons accumulate in the intermembranal space of mitochondria.

Options

A. Both statement 1 and 2 are correct.
B. Statement 1 is correct but statement 2 is incorrect.
C. Statement 1 is incorrect but statement 2 is correct
D. Both statements 1 and 2 are incorrect.

Answer

To solve the question regarding the statements about photosynthesis and respiration, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding Statement 1**:
- The first statement claims that during photosynthesis, protons accumulate in the lumen of the thylakoid.
- In photosynthesis, specifically during the light-dependent reactions, water is split (photolysis) in the thylakoid lumen. This process releases protons (H+ ions) into the lumen, leading to an accumulation of protons there.
- This proton accumulation creates a proton gradient that is essential for ATP synthesis via ATP synthase.

2. **Understanding Statement 2**:
- The second statement claims that during respiration, protons accumulate in the intermembrane space of mitochondria.
- In cellular respiration, particularly during the electron transport chain (ETC), protons are pumped from the mitochondrial matrix into the intermembrane space. This results in a higher concentration of protons in the intermembrane space compared to the matrix.
- This proton gradient is also crucial for ATP synthesis as protons flow back into the matrix through ATP synthase, generating ATP.

3. **Evaluating the Statements**:
- Both statements accurately describe the processes of photosynthesis and respiration.
- In photosynthesis, protons do accumulate in the lumen of the thylakoid, and in respiration, protons accumulate in the intermembrane space of mitochondria.

4. **Selecting the Correct Option**:
- Since both statements are correct, the correct option is: **Both statement 1 and 2 are correct**.

### Final Answer:
The correct option is: **Both statement 1 and 2 are correct.**

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