Tuesday, May 31, 2011

Leaves Losing Their Green Colour:







Leaves Losing their green colour:
By Joseph
Leaves are like little solar panels. Just like solar cells can use light to produce energy or electricity, leaves use light from the sun to make food for the tree. This process is called photosynthesis which means “to be put together with light”. When the light enters a leaf a special part called the chloroplast (klo-ro-plast), uses the light to change carbon dioxide and water into breathable oxygen and a type of sugar called glucose. Inside a chloroplast is a chemical called chlorophyll. Chlorophyll is very important, because it is the chemical that will allow photosynthesis to take place and it also gives the leaves their nice green colour. When autumn has come and winter is almost here you’ll figure out that that the days are getting shorter and shorter, much shorter than during the summer. That will mean the leaves won’t get as much light as they used to get in summer, which means the amount of chlorophyll decreases. Chlorophyll keeps the leaves green so that when the leaves lose chlorophyll so they lose their green colour. Eventually they die for the lack of enough chlorophyll and so they become useless and we see the resultant brown dead leaves lying on the ground.

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