During photosynthesis, the oxygen gas comes from :

Options

A. `CO_(2)`
B. Water
C. Both `CO_(2)` and water
D. Oxygen via air

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 occurs in the chloroplasts of plant cells.

2. **Reactants of Photosynthesis**: The main reactants involved in photosynthesis are carbon dioxide (CO2) and water (H2O). These reactants are essential for the photosynthetic process.

3. **Role of Chlorophyll**: Chlorophyll is a green pigment found in chloroplasts that captures light energy from the sun. This energy is crucial for driving the photosynthetic reactions.

4. **Chemical Equation of Photosynthesis**: The overall chemical equation for photosynthesis can be summarized as:
\[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \]
In this equation, glucose (C6H12O6) is produced, and oxygen gas (O2) is released as a byproduct.

5. **Source of Oxygen**: The oxygen gas produced during photosynthesis comes specifically from the splitting of water molecules (H2O). This process is often referred to as photolysis or hydrolysis of water, which occurs in the presence of light energy.

6. **Conclusion**: Therefore, during photosynthesis, the oxygen gas is derived from water (H2O), not from carbon dioxide. The correct answer to the question is that the oxygen gas comes from water.

**Final Answer**: The oxygen gas during photosynthesis comes from water (H2O).

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