In which one of the following processes `CO_(2)` is fixed

Options

A. Lactate fermentation
B. Aerobic respiration in plants
C. Aerobic respiration in animals
D. Alcoholic fermentation

Answer

**Step-by-Step Solution:**

1. **Understanding CO2 Fixation**: The term "CO2 fixation" refers to the process where carbon dioxide (CO2) is converted into organic compounds, primarily carbohydrates, which can be used by living organisms as a source of energy.

2. **Identifying the Processes**: The question provides four processes to consider:
- Photosynthesis
- Aerobic respiration in plants
- Aerobic respiration in animals
- Alcoholic fermentation

3. **Analyzing Each Process**:
- **Photosynthesis**: This is the process where plants use sunlight, water, and carbon dioxide to produce glucose (a carbohydrate) and oxygen. During this process, CO2 is fixed into organic molecules.
- **Aerobic Respiration in Plants and Animals**: In these processes, glucose is broken down with the help of oxygen to release energy. CO2 is produced as a by-product, meaning it is not fixed but rather released.
- **Alcoholic Fermentation**: This is a process used by yeast and some bacteria where glucose is converted into ethanol and carbon dioxide. Similar to aerobic respiration, CO2 is released as a by-product.

4. **Conclusion**: Among the processes listed, only photosynthesis is responsible for fixing CO2 into organic compounds. Therefore, the correct answer is **photosynthesis**.

**Final Answer**: Photosynthesis is the process in which CO2 is fixed.

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