Why Do Deciduous Trees Change Colors And Evergreens Don’t?

Kenny Freeman
1st Hour, Mr. Schwarz, Biology, 11/09/2007
Why Do Deciduous Trees Change Colors And Evergreens Don’t?



Evergreen Trees
But there are some trees that not only stay green, but they also keep their leaves for winter.Some Evergreen trees have needlesNeedles have fewer surfaces than big flat leaves and can resist changes in temperature and humidity more easily.They do lose their leaves. But they are able to grow new leaves before getting rid of the old ones. Some evergreens keep the same leaves through the winter and into the summer. Some trees are able to keep the same leaves for several years before they drop off. So the chlorophyll is there all year round because the evergreen trees do photosynthesis all year round.



Deciduous Trees
They take a gas called carbon dioxide from the air. Plants use sunlight to turn water and carbon dioxide into glucose. Glucose is a kind of sugar. Plants use glucose as food for energy and as a building block for growing. The way plants turn water and carbon dioxide into sugar is called photosynthesis. That means, putting together with light. A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives plants their green color. The chlorophyll is not there all year round as we can tell since it does not do photosynthesis all year round otherwise it would.