Sunlight is an important part of photosynthesis. This is because Photosynthesis is the when a plant turns the energy that it gets from the Sun into energy that the plant can use.When a plant has more sunlight it can photosynthesize faster because there is more sunlight for the plant to convert into energy.he energy from the light of the sun enters the pores of the stomata of the leaves of the plant and energy is consumed within the processes performed by plant and is stored in the mitochondria of the cell of the plant cell. Thus 1 can say that for photosynthesis to occur, sunlight is essential.