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Photosynthesis in Higher Plants — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYPhotosynthesis in Higher Plants3 Marks
Question
Why does not photorespiration take place in C4 plants?
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Answer

In C4 plants photorespiration does not occur. This is because they have a mechanism that increases the concentration of CO2 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 CO2.This results in increasing the intracellular concentration of CO2. This ensures that the RuBis O function as a carboxylase minimizing the oxygenase activity.

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