Humans and plants are living things .All living things need food in order to survive.Humans buy or cook their own food but plants can neither move nor cook so where do they get their food from ?
They photosynthesis .Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight carbon dioxide and water to produce glucose.During the day , plants give out oxygen,as a waste product,it is arguably the most important biochemical pathway known; nearly all life depends on it. Chlorophyll in the green leaves help the plant to make food .Plants respire both during the day and at night.They only photosynthesis during the day or in the presence of light .
Photosynthesis occurs in two stages. In the first phase light-dependent reactions or photosynthetic reactions capture the energy of light and use it to make high-energy molecules. During the second phase, the light-independent reactions use the high-energy molecules to capture carbon dioxide (CO2) and make the precursors of glucose.
carbon dioxide + water + light energy → glucose + oxygen + water
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