Q.

Current availability of CO2 levels in atmosphere is limiting to all, except 

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a

maize and sugarcane 

b

tomato and rice 

c

tomato and bell pepper

d

wheat and tomato 

answer is C.

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Detailed Solution

Current availability of CO2 levels in the atmosphere is limiting to all, except maize and sugarcane as they are C4 plants. The C4 plants show saturation at about 360 μlL-1 while C3 responds to increased CO2 concentration and saturation is seen only beyond 450 μlL-1. Thus, current availability of CO2 levels is limiting to the C3 plants.

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