Green plants have chlorophyll pigment that serves to trap the sunlight. The light energy from sun is used to drive the ATP synthesis during light dependent reactions of photosynthesis. The ATP serves as energy source for dark phase of photosynthesis during which carbon dioxide is fixed into glucose. Hence, plants use the process of photosynthesis to convert the light energy of sun into chemical energy of glucose.
<span>DNA methylation is a process that can change the activity of a gene without rearranging the DNA sequence. The mechanism most often is used to inactivate genes.</span>
