The cycle of how plants make energy is called Photosynthesis.
The plant absorbs sunlight, water, minerals and carbon dioxide through small holes called stomata on the underside of the their leaves.
The plant then uses these to make glucose (sugar) which is the food or energy the plant requires.
Oxygen is also produced by the plant through photosynthesis. That’s why it is important to have lots of trees around!
The air around plants is clean and pure as they are filling the air with oxygen. Think about how fresh and clean the air tastes in a forest!