Why photosynthesis is essential for sustaining life on earth ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Photosynthesis**: Photosynthesis is the process by which green plants, some bacteria, and certain algae convert light energy into chemical energy, producing food (glucose) and oxygen from carbon dioxide and water.

2. **Role of Chlorophyll**: The green pigment called chlorophyll, found in the chloroplasts of plant cells, plays a crucial role in photosynthesis. It absorbs sunlight, which is essential for the process to occur.

3. **Production of Oxygen**: During photosynthesis, plants take in carbon dioxide from the atmosphere and release oxygen as a byproduct. This oxygen is vital for the survival of most living organisms, as it is used in cellular respiration.

...