Like all plants, trees need their leaves to stay alive. Leaves are a tree's food factories. They contain a sticky green stuff called chlorophyll. The chlorophyll uses water, sunlight and carbon dioxide in the air to make a sugary food. The food is then carried to every part of the tree in a sweet and sticky juice called sap.
Big green leaves are useful in spring and summer. They make food while the sun shines and the days are long. When the days get shorter, there's less time for making food and the tree must live off its food reserves. Rather than feed their leaves too, some trees shed their leaves in autumn.
It's the chlorophyll in a plant's leaves that makes them look green. But in autumn, the chlorophyll breaks down. Once the green colouring has gone, the leaves' other colors show through - beautiful shades of red, yellow and gold.
3 comments:
i never ever now that and i always learn something now every day.
What happens to the bare tree in fall and winter?
this is cool
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