Energy is the ability or capacity to do work. All living things need energy to carry out the processes of life. Of all natural sources of energy, the SUN is the ultimate source of energy for the living world. The energy we receive from the sun’s radiation is known as radiant energy. Plants use this to manufacture their own food. The green part of the plants captures the sun’s energy through the help of the chlorophyll, to manufacture its food through the process known as photosynthes...