During photosynthesis `O_(2)` is liberated by oxidation of

Options

A. `H_(2)O`
B. `CO_(2)`
C. Phosphohlyceralbehyde
D. None.

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which plants convert light energy into chemical energy to produce food. This process occurs mainly in the chloroplasts of plant cells and involves two main stages: the light reactions and the dark reactions (Calvin cycle).

2. **Identifying the Light Reactions**: The light reactions occur when chlorophyll absorbs sunlight, which leads to the conversion of light energy into chemical energy. During this phase, water molecules are split in a process known as photolysis.

3. **Photolysis of Water**: The photolysis of water involves the breaking down of water molecules (H₂O) into oxygen (O₂), protons (H⁺), and electrons (e⁻). This reaction is crucial because it is the source of the oxygen released during photosynthesis.

4. **Oxygen Liberation**: The oxygen produced in the light reactions is released as a byproduct into the atmosphere. Thus, the correct answer to the question is that oxygen is liberated by the oxidation (or splitting) of water.

5. **Role of Carbon Dioxide and Other Options**: While carbon dioxide is used in the dark reactions to produce glucose, it does not contribute to the release of oxygen. Phosphoglyceraldehyde is an intermediate in the Calvin cycle and is not involved in oxygen liberation. Therefore, the other options (carbon dioxide, phosphoglyceraldehyde, and none) are incorrect.

6. **Conclusion**: The correct answer to the question is that during photosynthesis, oxygen is liberated by the oxidation of water.

**Final Answer**: Oxygen is liberated by the oxidation of water during photosynthesis.

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