What is the source of oxygen released during photosynthesis ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which plants prepare their own food using sunlight, carbon dioxide (CO2), and water (H2O). It primarily occurs in the chloroplasts of plant cells.

2. **Key Steps in Photosynthesis**: The process of photosynthesis can be divided into three main steps:
- **Absorption of Sunlight**: Plants capture sunlight using chlorophyll, the green pigment in leaves.
- **Photolysis of Water**: Water molecules are split into hydrogen ions (H+), electrons (e-), and oxygen (O2) using the energy from sunlight.
- **Reduction of Carbon Dioxide**: The hydrogen ions and electrons are then used to convert carbon dioxide into glucose (C6H12O6).
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