The specific function of light energy in the proess of photosynthesis is to

Options

A. Reduction of `CO_(2)`
B. Activate other molecules
C. Split water molecules
D. None of the above.

Answer

To answer the question regarding the specific function of light energy in the process of photosynthesis, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**: Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The specific function of light energy pertains to the light-dependent reactions.

2. **Role of Light Energy**: Light energy is absorbed by chlorophyll, the green pigment found in the chloroplasts of plant cells. This absorption is crucial for initiating the photosynthesis process.

3. **Absorption of Photons**: When chlorophyll absorbs photons (light energy), it becomes excited. This excitation causes chlorophyll to lose an electron.

4. **Electron Transport Chain**: The lost electron from chlorophyll is transferred to a molecule called pheophytin. From pheophytin, the electron is passed along a series of proteins in the electron transport chain, ultimately leading to the reduction of NADP+ to NADPH and the phosphorylation of ADP to ATP.

5. **Proton Gradient Formation**: As electrons move through the electron transport chain, protons (H+ ions) are pumped into the thylakoid lumen, creating a proton gradient. This gradient is used to generate ATP through ATP synthase.

6. **Conclusion**: Therefore, the specific function of light energy in photosynthesis is to activate chlorophyll, leading to the transfer of electrons through the electron transport chain, resulting in the production of ATP and NADPH, which are essential for the light-independent reactions.

### Final Answer:
The specific function of light energy in the process of photosynthesis is to activate chlorophyll, which initiates the electron transport chain that produces ATP and NADPH.

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