Oxygen liberated during photosynthesis comes from

Options

A. water
B. chlorophyll
C. carbon dioxide
D. glucose

Explanation

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which plants prepare their own food using sunlight, carbon dioxide, and water.

2. **Role of Chlorophyll**:
- Chlorophyll, the green pigment in plants, is essential for capturing sunlight, which is necessary for the photosynthesis process.

3. **Chemical Equation of Photosynthesis**:
- The general equation for photosynthesis can be represented as:
\[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \]
- In this equation, carbon dioxide (CO2) and water (H2O) are used to produce glucose (C6H12O6) and oxygen (O2).

4. **Source of Oxygen**:
- During photosynthesis, the oxygen that is released into the atmosphere comes from the splitting of water molecules (H2O).

5. **Splitting of Water**:
- The water molecules are split into hydrogen and oxygen. The oxygen is released as a byproduct, while the hydrogen is used to help convert carbon dioxide into glucose.

6. **Conclusion**:
- Therefore, the oxygen liberated during photosynthesis comes from the water molecules that are split during the process.

### Final Answer:
The oxygen liberated during photosynthesis comes from water (H2O).

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