passage 5 Structure of sugar
Atoms of carbon , hydrogen and oxygen are put together to make molecules of sugar a carbohydrate food substance. The carbon comes from carbon dioxide gas in the air. Air enter through holes , called stomate , in the plant's leaves. The hydrogen and oxygen come from water. The water is taken up from the soil by the plant's roots. The light energy is trapped by a special chemical called chlorophyll. Chlorophyll is green and gives green plants their color. The gas oxygen is left over at the end of photosynthesis and goes into the air.