How are photosynthesis and cellular respiration coupled reactions?

1 Answer
Sep 19, 2015

The products of photosynthesis are the reactants for respiration, and the products of respiration are the reactants for photosynthesis.


Photosynthesis is a complex set of enzyme-catalyzed reactions that use carbon dioxide (CO2), water (H2O) and light energy to create glucose (C6H12O6) and oxygen gas (O2).

Cellular respiration is a complex set of enzyme-catalyzed reactions that break apart glucose, making 6 molecules of CO2 along the way. The final step of respiration uses oxygen as a driving force to create energy in the form of ATP. As a result, O2 gas is reduced to H2O.

So, the glucose and O2 created by photosynthesis is used in respiration to make CO2 and water - the materials needed in photosynthesis. In this way, these two reactions are coupled.

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