2
Question
Which crop utilises solar energy most efficiently?
Which crop utilises solar energy most efficiently?
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Solution
The correct option is C Sugarcane
The same active site of RUBISCO catalyze carboxylation and oxidation of ribulose 1,5-bisphosphate thereby competing with each other. Under standard 25°C, the rate of the carboxylation reaction is four times that of the oxidation reaction and 20% of fixed carbon is lost in photorespiration. Spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of C4 plants respectively avoids photorespiration by concentrating CO2 in bundle sheath cells to scale down the oxygenase activity of RUBISCO and increase the RUBISCO efficiency. Among the given options, sugarcane is a C4 plant and rest are C3 plants. Correct answer is B.
The same active site of RUBISCO catalyze carboxylation and oxidation of ribulose 1,5-bisphosphate thereby competing with each other. Under standard 25°C, the rate of the carboxylation reaction is four times that of the oxidation reaction and 20% of fixed carbon is lost in photorespiration. Spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of C4 plants respectively avoids photorespiration by concentrating CO2 in bundle sheath cells to scale down the oxygenase activity of RUBISCO and increase the RUBISCO efficiency. Among the given options, sugarcane is a C4 plant and rest are C3 plants. Correct answer is B.
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