Discover: Fall Leaves

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Why Do Leaves Change Colour in Fall?

Have you walked outside and noticed the leaves in the trees changing colours from bright greens to a mix of reds, yellows and browns? Well it’s a sure sign that winter is on its way!

But why are the leaves changing colour, and why are they falling off of the trees?

Well the first thing you need to know is that leaves are green because of a chemical in them called “Chlorophyll”. Chlorophyll gives a leaf its green colouring, and absorbs sunlight that the tree uses to turn water and carbon dioxide into food for itself. This is called photosynthesis.

When the fall season arrives and the days begin to get shorter, there is no longer enough sunlight for photosynthesis to happen. The trees stop making chlorophyll and instead begin using the energy they collected during the summer.

When the green chlorophyll fades from the leaves, the other colours in the leaves that were hidden by the green start to come through – the reds, oranges, and yellows. So rather than using its energy to keep its leaves full and green, the tree will let them all fall to the ground, ready to regrow them in the spring.

So now that you know why the leaves change colours, let’s go outside and see how many different colours are in the leaves today!

This article was written by Admin