Photosynthesis is a

Options

A. Physico-chemical process
B. Physical process
C. Chemical process
D. Catabolic process

Answer

To solve the question "Photosynthesis is a", we will analyze the options provided and understand the nature of the photosynthesis process.

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which autotrophs (like plants, green algae, and some bacteria) convert light energy into chemical energy in the form of glucose.

2. **Identifying the Nature of the Process**:
- Photosynthesis involves two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle).
- In the light-dependent reactions, sunlight is captured and used to produce energy-rich molecules (ATP and NADPH).
- In the light-independent reactions, carbon dioxide is fixed and converted into glucose using the energy from ATP and NADPH.

3. **Analyzing the Options**:
- **Physico-chemical process**: This option suggests that photosynthesis involves both physical (light energy) and chemical (chemical reactions) components.
- **Physical process**: This option would imply that photosynthesis only involves physical changes, which is incorrect since chemical reactions are also involved.
- **Chemical process**: This option would imply that photosynthesis only involves chemical reactions, which is also incorrect as it requires light energy.
- **Catabolic process**: This option refers to the breakdown of molecules, which does not apply to photosynthesis as it is building larger molecules (glucose) from smaller ones (carbon dioxide and water).

4. **Conclusion**:
- Based on the analysis, photosynthesis is best described as a **physico-chemical process** because it involves both the physical capture of light energy and the chemical reactions that convert carbon dioxide and water into glucose.

### Final Answer:
Photosynthesis is a **physico-chemical process**.

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