First stable product of `C_(4)//HSK` photosynthesis is

Options

A. Phosphoglyceric acid
B. Ribulose 1, 5-biphosphate
C. Malic acid
D. Phosphoglyceraldehyde.

Answer

To determine the first stable product of C4 (Hatch-Slack pathway) photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand C4 Photosynthesis**:
- C4 photosynthesis, also known as the Hatch-Slack pathway, occurs in certain plants that have adapted to high light intensities and temperatures.

2. **Identify the Types of Cells Involved**:
- In C4 plants, two types of cells are involved in photosynthesis: mesophyll cells and bundle sheath cells.

3. **Recognize the Reactions in Each Cell**:
- The light-dependent reactions occur in the mesophyll cells, while the Calvin cycle (light-independent reactions) takes place in the bundle sheath cells.

4. **Determine the First Stable Product**:
- During the C4 pathway, the first stable product formed in the mesophyll cells is a four-carbon compound.

5. **Identify the Four-Carbon Compound**:
- The first stable product of C4 photosynthesis is malic acid, which is a four-carbon compound.

6. **Conclusion**:
- Therefore, the first stable product of C4 or HSK photosynthesis is malic acid.

### Final Answer:
The first stable product of C4 (Hatch-Slack pathway) photosynthesis is **malic acid**.

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