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Question

In C4 plants photorespiration does not occur due to

A
presence of Rubisco enzyme
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B
presence of high light intensity
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C
increased concentration of CO2 at enzyme site
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D
presence of bundle sheath cells
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Solution

The correct option is C increased concentration of CO2 at enzyme site
In C4 plants, photorespiration does not occur because they have a mechanism that increases the concentration of CO2 at the enzyme site. This takes place when the C4 acid from the mesophyll is broken down in the bundle sheath cells to release CO2. This results in an increase in the intracellular concentration of CO2. This ensures that the RuBisCO functions as a carboxylase, thus, minimising the oxygenase activity.

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