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Question

C4 plants are more efficient in photosynthesis at higher temperature due to presence of

A
Bundle sheath
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B
Pyruvic phasphate dikinase
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C
Well differentiated mesophyll
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D
Agrannel plastids in bundle sheath
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Solution

The correct option is A Bundle sheath
The C4 plants show kranz anatomy with their vascular bundles being surrounded by two cellular rings i.e., bundle sheath cells (inner) and mesophyll cells (outer). The main function of this anatomy is to provide a site in which CO2 can be concentrated around RuBisCO, that is to maintain a higher concentration of CO2 in the bundle sheath compared to the mesophyll. This happens as the boundary layer of the kranz has a low conductance to CO2, thereby avoiding photorespiration. Therefore, C4 plants are able to more efficiently fix carbon in drought, high temperatures, and limitations of nitrogen or CO2.
So the correct option is 'Bundle sheath'

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