Plants use a chemical reaction called Photosynthesis to convert Carbon di-Oxide and water into food (glucose) and Oxygen.

It’s one of the most common everyday chemical reactions around us and also one of the most important since this is how plants produce food for themselves and convert Carbon di-Oxide into Oxygen which is essential for all the human life on Earth.

Reaction which takes place in this is-

6 CO₂ + 6 H₂O + light → C₆H₁₂O₆ + 6 O₂