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Green plants make their own food in their leaves by a process called PHOTOSYNTHESIS.

Photosynthesis happens when the leaves of a green plant get sunlight, carbon dioxide air, and water. It turns these ingredients into a food called glucose. It is a type of sugar.

Green plants give off oxygen from their leaves because of photosynthesis. It is a waste product they don't need.

The green chemical in the leaf is called chlorophyll. When leaves lose this chlorophyll in the autumn, they can no longer produce food. The leaves fall off.