Sunlight is very important towards a plants growth, it provides light for photosynthesis and helps
move water up the plant water exaporates from the leaves and other parts of the plant above the ground. The evaporation of water from the plant is called transpiration.
Transpiration occurs mainly through the stomata. However, as water is lost from the leaves, more water enters the roots and flows up the stem.
The water flows up the plant in narrow pipes. These tubes make up the xylem. The walls of the tubes are made of lignin, which is hard and waterproof.
Water rises up the stem mainly by being pulled from above. The pull is created by the evaporation of water from the leaves. if you
cut off the leaves or block the stomata, the flow of water up the stem slows down or stops. The drier the weather, the greater the rate of transpiration. In very dry weather,
water may evaporate from the leaves faster than it is refilled by the roots. The plant then suffers from lack of water.
Normally a plants cells are full of water, and all the cells are pressing against each other.
This helps to support the plant and holds the leaves out flat. If a plant runs out of water, the cells lose water and go flacid/floppy. The plant then droops.
This is called wilting. Plants living in dry places have all sorts of adaptations for preventing wilting. For example; closing the stomata so that the plant conserves energy and water.
Photosynthesis converts light energy into the chemical energy of sugars and other things.
This process consists of chemical reactions that require carbon dioxide (CO2) and water (H2O) and store chemical energy in the form of sugar.
Light energy from the sun triggers the chemical reactions. Oxygen (O2) is a byproduct of photosynthesis and is released into the atmosphere. This equation shows how photosynthesis works.
6 CO2 + 6 H2O = 6(CH2O) + 6 O2 sugar
Taking all this into simple terms sunlight is very important for the growth and health...