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The leaves of a green plant are the part that exchanges gases with its surroundings.

The leaves also give out or transpire water.

Green plants are able to make their own food in a process called photosynthesis.

When sunlight is present the leaves use light energy and take in carbon dioxide. This is converted into sugars and starches which can be stored.

Oxygen passes back to the atmosphere.



Plants need to respire and use the food they have made, together with oxygen to produce energy.

The leaves allow carbon dioxide and water vapour to escape into the atmosphere.




Some trees keep their leaves all though the winter.

These are usually coniferous trees and are often called ever greens.

Coniferous trees are narrower at the top and broader at the bottom.

They have thin needle shaped leaves and their seeds are contained in cones.




Some trees lose their leaves in the autumn and they do not grow back until the following spring.

These are deciduous trees.


Why do trees lose their leaves in the autumn?