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(D) Photorespiration is a process that occurs in $C_3$ plants but is absent or negligible in $C_4$ plants.In $C_3$ plants,the enzyme $RuBisCO$ can bin

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Photorespiration

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(D) Photorespiration is a process that occurs in $C_3$ plants but is absent or negligible in $C_4$ plants.In $C_3$ plants,the enzyme $RuBisCO$ can bind with both $CO_2$ and $O_2$.When $O_2$ binds to $RuBisCO$,it leads to photorespiration,which results in the loss of fixed carbon and energy.$C_4$ plants have evolved a mechanism to concentrate $CO_2$ around the $RuBisCO$ enzyme in bundle sheath cells,thereby minimizing photorespiration and increasing photosynthetic efficiency.

The process that represents a significant difference between $C_3$ and $C_4$ plants is ..........

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