Almost all the food on the planet originally comes from the .
plants make food by photosynthesis.
This occurs in the of a plant.
The three things needed for photosynthesis to occur are light, carbon dioxide and .
Most leaves are broad, flat and thin which allows the maximum amount of to be absorbed by the plant.
Leaves have openings called which allow the carbon dioxide in.
Water is absorbed through the .
Chloroplasts are found in green plants and contain , a green pigment needed for photosynthesis.
Chlorophyll traps light form the sun and uses it to combine dioxide and water.
and oxygen are formed from this reaction.
cannot make their own food, so photosynthesis is an important process.
Without it, we could not .