Trees and plants are also living beings. They need food, water and air for survival. It is interesting to know how they take their food.                 Plants get their food both from the earth and the air. If you look at their roots they are like fine fibers. We call them root hairs. They absorb water and minerals and transport them upwards to the leaves through the trunk and the branches.                 Chlorophyll in the leaves prepare the food like a machine. It converts the carbon dioxide taken from the air and water from the ground into sugar with the help of sunlight. This chemical reaction is called photosynthesis.                 Sugar is further converted into starch and is stored in the plant. The minerals are converted by chemical processes into protein, juice, oil, and other edible materials. The plants use these materials as their food for growth. What is the job of root-hairs?