Which of the following statements is incorrect regarding the Calvin cycle of `C_(3)` plants?

Options

A. First stable product of Calvin cycle in `C_(3)` plants is 3-Phosphoglyceric acid.
B. Sunflower is an example of `C_(3)` plants.
C. Calvin cycle occurs in bundle sheath cells of `C_(3)` plants.
D. Enzyme PEP case is absent in `C_(3)` plants.

Explanation

To determine which statement is incorrect regarding the Calvin cycle of C3 plants, we will evaluate each option provided in the question:

1. **First Statement**: "The first stable product of the Calvin cycle in C3 plants is 3-phosphoglyceric acid."
- In the Calvin cycle, the first stable product formed after the reaction of ribulose 1,5-bisphosphate (RuBP) with carbon dioxide (CO2) is indeed 3-phosphoglyceric acid (PGA). This statement is correct.

2. **Second Statement**: "Sunflower is an example of a C3 plant."
- Sunflower (Helianthus annuus) is classified as a C3 plant. Therefore, this statement is also correct.

3. **Third Statement**: "Calvin cycle occurs in the bundle sheath cells of the C3 plant."
- The Calvin cycle in C3 plants occurs primarily in the mesophyll cells, not the bundle sheath cells. This statement is incorrect.

4. **Fourth Statement**: "Enzyme PEP carboxylase is absent in the C3 plant."
- PEP carboxylase (PEPCase) is an enzyme that is primarily found in C4 plants and is responsible for the initial fixation of CO2 in the C4 pathway. In C3 plants, this enzyme is not present. This statement is correct.

Based on the evaluation, the incorrect statement regarding the Calvin cycle of C3 plants is:

**Answer**: The third statement: "Calvin cycle occurs in the bundle sheath cells of the C3 plant."