Which statement about photosynthesis is incorrect ?

Options

A. In `C_4` plants , the mesophyll cells have PEPcase but don't have RuBisCo
B. `F_0` portion of ATP synthase enzyme protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma.
C. Stromal lamellae don't have PSII and NADP reductase enzyme.
D. When carbon dioxide and oxygen is available in equal quantity , RuBisCo has a much greater affinity for carbon dioxide

Answer

To determine which statement about photosynthesis is incorrect, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which plants and some other organisms convert light energy from the sun into chemical energy in the form of glucose. This process primarily occurs in the chloroplasts of plant cells.

2. **Analyzing the Statements**:
- **Statement 1**: "In C4 plants, the mesophyll cells have PEP carboxylase, but they don't have rubisco."
- **Analysis**: This statement is correct. C4 plants use PEP carboxylase in their mesophyll cells to fix carbon dioxide, while rubisco is found in the bundle sheath cells.

- **Statement 2**: "F0 portion of ATP synthase enzyme protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma."
- **Analysis**: This statement is incorrect. The F0 portion of ATP synthase is embedded in the thylakoid membrane, while the F1 portion protrudes into the stroma. Therefore, this statement misrepresents the location of the F0 portion.

- **Statement 3**: "Stromal lamellae don't have PS-1, PS-2, and NADP reductase enzyme."
- **Analysis**: This statement is correct. The stromal lamellae primarily contain photosystem I (PS-1) but do not contain photosystem II (PS-2) or NADP reductase.

- **Statement 4**: "When carbon dioxide and oxygen are available in equal quantities, rubisco has a much greater affinity for carbon dioxide."
- **Analysis**: This statement is also correct. Rubisco has a higher affinity for carbon dioxide compared to oxygen, which is essential for its role in the Calvin cycle.

3. **Conclusion**:
- The only incorrect statement about photosynthesis is **Statement 2**.

### Final Answer:
The incorrect statement about photosynthesis is: "F0 portion of ATP synthase enzyme protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma."

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