Photosynthesis is the process by which green plants utilize the energy from the sun to make sugar (glucose) for food. Plants absorb the energy from sunlight, while they take in carbon dioxide from the air through their leaves, take up water through their roots, and then produce glucose and oxygen. Photosynthesis occurs on land and in shallow water where sunlight can emit on seaweeds.
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| Photosynthesis |
Chemosynthesis
This is a process by which food (glucose) is made by bacteria using chemicals as energy source instead of sunlight. Chemosynthesis takes place around hydrothermal vents and methane seeps in the deep sea where sunlight is absent. During chemosynthesis, bacteria living on the sea floor or within animals, such as mussels and tapeworms, use energy stored in the chemical bonds of hydrogen sulfide and methane to make glucose from water and carbon dioxide. By-products are produced by pure sulfur and sulfur compounds.
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| Chemosynthesis |
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