Question
Why does not photorespiration take place in $\mathrm{C}_4$ plants?
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Answer
In $\mathrm{C}_4$ plants photorespiration does not occur. This is because they have a mechanism that increases the concentration of $\mathrm{CO}_2$ at the enzyme site and due to the kranz anatomy. The mesophyll cells lacks RuBis Co enzyme. The malic acid from the mesophyll is broken down in the bundle sheath cells to release $\mathrm{CO}_2$. This results in increasing the intracellular concentration of $\mathrm{CO}_2$. This ensures that the RuBis O function as a carboxylase minimizing the oxygenase activity.
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