Oxygen present in the glucose molecule formed during photosynthesis is obtained from:

Options

A. Water molecule
B. Carbondioxide molecule
C. Chlorophyll
D. Oxygen in air

Explanation

To solve the question regarding the source of oxygen in the glucose molecule formed during photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.
- The general equation for photosynthesis can be represented as:
\[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \]

2. **Identifying Reactants**:
- In the equation, the reactants are carbon dioxide (CO2) and water (H2O).
- Plants absorb carbon dioxide from the atmosphere and water from the soil.

3. **Formation of Glucose and Oxygen**:
- During photosynthesis, the absorbed carbon dioxide and water are used to produce glucose (C6H12O6) and oxygen (O2).
- The oxygen released as a byproduct comes from the splitting of water molecules during the light-dependent reactions of photosynthesis.

4. **Source of Oxygen in Glucose**:
- The question specifically asks about the oxygen present in the glucose molecule.
- The oxygen atoms in glucose (C6H12O6) are derived from carbon dioxide (CO2) rather than water (H2O).

5. **Conclusion**:
- Therefore, the oxygen present in the glucose molecule formed during photosynthesis is obtained from carbon dioxide.

### Final Answer:
The oxygen present in the glucose molecule formed during photosynthesis is obtained from **carbon dioxide (CO2)**.

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