Light energy is used in photosynthesis for

Options

A. Breakdown of `H_(2)O`
B. Breakdown of `CO_(2)`
C. Activation of chlorophyll
D. Breakdown of `C_(6)H_(12)O_(6)`.

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 stored in glucose.

2. **Role of Light Energy**:
- Light energy is crucial for photosynthesis as it provides the energy needed for various reactions to occur.

3. **Chlorophyll's Function**:
- Chlorophyll is the green pigment found in the chloroplasts of plant cells. It plays a vital role in absorbing light energy.

4. **Excitation of Electrons**:
- When light of a specific wavelength hits the chlorophyll, it excites the electrons present in the chlorophyll molecules. This means that the electrons gain energy and move to a higher energy state.

5. **Electron Transfer**:
- The excited electrons are transferred from chlorophyll to a series of proteins known as the electron transport chain. This process is essential for the conversion of light energy into chemical energy.

6. **Oxidation of Molecules**:
- As the electrons move through the electron transport chain, they help in the oxidation of molecules such as NADP+ (Nicotinamide adenine dinucleotide phosphate), which is crucial for the synthesis of energy-rich compounds.

7. **Conclusion**:
- Therefore, the primary role of light energy in photosynthesis is to activate chlorophyll, enabling it to facilitate the necessary reactions for converting light energy into chemical energy.

8. **Final Answer**:
- The correct answer to the question "Light energy is used in photosynthesis for" is **activation of chlorophyll** (Option C).