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Photorespiration
 
Definition:
Biology Glossary search by EverythingBio.com
 
     
  A process that reduces the yield of photosynthesis, because the active site of rubisco accepts O2 in place of CO2 and generates no ATP. This usually occurs on hot, dry days when stomata are closed and the O2 concentration in the leaf exceeds that of CO2, thereby competing for a common active site.  
     


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