`ATP` molecules required to synthesise one molecule of glucose by `C_(4)` pathway are

Options

A. 12
B. 18
C. 24
D. 30

Answer

To determine the number of ATP molecules required to synthesize one molecule of glucose through the C4 pathway, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the C4 Pathway**: The C4 pathway, also known as the Hatch-Slack pathway, is a method of carbon fixation used by certain plants (C4 plants). It involves the fixation of carbon dioxide into a 4-carbon compound before it enters the Calvin cycle.

2. **Carbon Dioxide Fixation**: For the synthesis of one molecule of glucose (C6H12O6), we need to fix 6 molecules of carbon dioxide (CO2) because glucose contains 6 carbon atoms.

3. **ATP Requirement for CO2 Fixation**: According to the C4 pathway, the fixation of one molecule of CO2 requires 5 ATP molecules.

4. **Calculate Total ATP for Glucose**: Since we need to fix 6 CO2 molecules for one glucose molecule, we can calculate the total ATP required:
\[ \text{Total ATP} = 5 \text{ ATP/CO2} \times 6 \text{ CO2} = 30 \text{ ATP} \]

5. **Conclusion**: Therefore, the total number of ATP molecules required to synthesize one molecule of glucose via the C4 pathway is 30.

### Final Answer:
The number of ATP molecules required to synthesize one molecule of glucose by the C4 pathway is **30**.

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