Which of the following processes does not con sume `O_(2)`?

Options

A. Photosynthesis
B. Respiration
C. Burning of fuel
D. Rusting

Explanation

To determine which of the following processes does not consume oxygen, let's analyze each option step by step:

1. **Photosynthesis**:
- Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen using sunlight.
- The overall reaction can be summarized as:
\[ 6CO_2 + 6H_2O \xrightarrow{sunlight} C_6H_{12}O_6 + 6O_2 \]
- In this process, oxygen is produced as a byproduct, not consumed.
- **Conclusion**: Photosynthesis does not consume oxygen.

2. **Respiration**:
- Respiration is a biochemical process in which glucose is oxidized to produce energy, carbon dioxide, and water.
- The overall reaction can be represented as:
\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy} \]
- Here, oxygen is required for the process to occur.
- **Conclusion**: Respiration consumes oxygen.

3. **Burning of Fuel**:
- Burning of fuel is a combustion reaction that requires oxygen to produce energy, carbon dioxide, and water.
- The general reaction for combustion can be written as:
\[ \text{Fuel} + O_2 \rightarrow CO_2 + H_2O + \text{Energy} \]
- Oxygen is consumed in this process.
- **Conclusion**: Burning of fuel consumes oxygen.

4. **Rusting**:
- Rusting is the process of oxidation of iron in the presence of moisture and oxygen, leading to the formation of iron oxide (rust).
- The reaction can be summarized as:
\[ 4Fe + 3O_2 + 6H_2O \rightarrow 4Fe(OH)_3 \]
- In this process, oxygen is consumed.
- **Conclusion**: Rusting consumes oxygen.

After analyzing all the options, we find that the only process that does not consume oxygen is **Photosynthesis**.

### Final Answer:
**Photosynthesis** does not consume oxygen.

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