Respiration and Photosynthesis

   Respiration is a process which provides energy to the body while photosynthesis is a direct or  indirect source of food for living beings. These three elements have basic role in these two processes. 


Respiration 


Oxygen is essential for life. it plays an important role in respiration. Respiration is the process by which living things use oxygen from the air to oxidize food substance  (mainly glucose) in their body cell.


               Glucose    +   Oxygen     ----------    Carbon dioxide    +    Water     +      Energy

When we breathe in, we take air into our lungs. The oxygen from the air then dissolves in the blood in our lungs. This dissolves oxygen is taken by hemoglobin to all parts of our body to react with glucose to produce energy. At the same time, carbon dioxide produced as a waste product is taken back to the lungs and breathed out.

                                                                 

photosynthesis 


Photosynthesis is a process by which green plants manufactures carbohydrates (glucose) from atmospheric carbon dioxide and water from the soil, in the presence of energy of sunlight.

 Water  +  Carbon dioxide   Sunlight  ---------  Chlorophyll      Glucose       +      Oxygen                                                  

This process only occurs in chlorophyllous cells of the leaves and stems. Oxygen is produced in this process as a by_product and released into the atmosphere. photosynthesis is effectively the reverse of respiration. 

this is also called anabolic (building up) process while the respiration process is called catabolic (breaking down) process.

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