What is the site of `C_(3)` cycle in `C_(3)` and `C_(4)` plants

Options

A. In `C_(3)` plant – mesophyll cell and In `C_(4)` plant – Bundle sheath cell
B. In `C_(3)` plant – Bundle sheath cell and In `C_(4)` plant – mesophyll cell
C. In `C_(4)` plant – Bundle sheath cell and In `C_(3)` plant – Bundle sheath cell
D. In `C_(3)` plant – mesophyll cell and In `C_(4)` plant – mesophyll cell

Answer

To answer the question about the site of the C3 cycle in C3 and C4 plants, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding C3 Plants:**
- In C3 plants, the C3 cycle (also known as the Calvin cycle) occurs in the mesophyll cells.
- The mesophyll cells contain chloroplasts where the light-independent reactions of photosynthesis take place, leading to the production of a 3-carbon sugar.

2. **Understanding C4 Plants:**
- In C4 plants, the process of photosynthesis is slightly different. The initial fixation of carbon dioxide occurs in the mesophyll cells, where a 4-carbon compound is formed.
- This 4-carbon compound is then transported to the bundle sheath cells, where the C3 cycle (Calvin cycle) takes place.

3. **Identifying the Sites:**
- For C3 plants: The site of the C3 cycle is the mesophyll cells.
- For C4 plants: The site of the C3 cycle is the bundle sheath cells.

4. **Reviewing the Options:**
- Now, we will look at the options provided:
- A: Mesophyll cell, Bundle sheath cell.
- B: Bundle sheath cell, Mesophyll cells.
- C: Bundle sheath cell, Bundle sheath cell.
- D: Mesophyll cell, Mesophyll cell.
- Based on our understanding, option A correctly states that the C3 cycle occurs in the mesophyll cells of C3 plants and in the bundle sheath cells of C4 plants.

5. **Conclusion:**
- Therefore, the correct answer to the question is **Option A: Mesophyll cell (for C3 plants) and Bundle sheath cell (for C4 plants)**.