During photosynthesis oxygen in glucose comes from

Options

A. `C_6H_12O_6`
B. `O_2`
C. `CO_2`
D. both (1) and (2)

Answer

**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 in the form of glucose. This process primarily takes place in the chloroplasts of plant cells.

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

3. **Identifying the Source of Oxygen in Glucose**: The question specifically asks about the source of oxygen in glucose (C6H12O6). To determine this, we need to analyze the components of the photosynthesis equation.

4. **Analyzing the Components**:
- From the equation, we can see that glucose (C6H12O6) is formed from carbon dioxide and water.
- The oxygen in glucose comes from the carbon dioxide (CO2) molecules used in the process.

5. **Conclusion**: Therefore, the oxygen that is present in glucose (C6H12O6) during photosynthesis originates from carbon dioxide (CO2).

6. **Final Answer**: The correct answer to the question is **carbon dioxide (CO2)**.

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