Friday, July 30, 2010


Photosynthesis is the process in which the green plants use light to produce food. Green plants manufacture glucose from water and carbon dioxide in the presence of sunlight trapped in their chlorophyll. Oxygen is then released to the environment in this process.

The importance of photosynthesis
  • it help to keep the level of carbon dioxide in the atmosphere constant 
  • it is the source of carbon for other organism   
  • it helps to keep the level of oxygen in the atmosphere constant
  • it enables green plants to make its own food  

Living organisms obtain their supply of energy from food they eat either directly or indirectly from the energy of sunlight trapped during photosynthesis. This explains an important role of photosynthesis in providing food to maintain a balanced ecosystem.
           The bodies of living organisms contain carbon. Carbon makes up the carbohydrates, proteins and fats in the tissues of living organisms. In our ecosystem, carbon in the form of carbon dioxide and other compound of carbon, circulates from the environment into the bodies of living organisms and then back into the environment again. This circulation of carbon and its compound is known as the carbon cycle.
           Oxygen is also circulating through our ecosystems. Green plants release oxygen as a product of photosynthesis into the air. At the same time, other living organisms take in oxygen and use it for their life processes. This circulation of oxygen and its compound is knows as the oxygen cycle.

Photosynthesis helps maintain a balanced ecosystem. Photosynthesis ensures that the amounts of oxygen and carbon dioxide remain at constant levels in the air through the carbon and oxygen cycles.

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