11th Class Biology Photosynthesis in Higher Plants

  • question_answer 68)
      Why does not photorespiration take place in  plants?  


                      Photorespiration is associated with  cycle, where plant lose  fixation because of the increase in concentrate ion of  and change the nature of activity of RuBP carboxylase-oxygenase. plants have evolved a mechanism to avoid loss of . There is not a direct contact of RuBP carboxylase-oxygenase as  cycle operates in bundle sheath cells (where both temperature and oxygen level low). fixation is done by another enzyme PEP carboxylase in mesophyll cells and oxaloacetate is formed which is converted to malic acid and transported to bundle sheath cells. There, it gives off  which is used in Calvin cycle, operating in bundle sheath cells of  plants.  

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