Question 134 please explain


Ans. Option b) is correct: Z > Y

C4 photosynthetic pathway makes sure that the minimum loss of water occur for the maximum CO2  fixed. For same amount of CO2 fixed, a C4 plant loses only half the amount of water lost by a C3 plant.
C4 plants have adaptation that help to keep the stomata closed more than being opened to prevent loss of water, same time making the CO2 concentration at enzyme site sufficient so that photorespiration is prevented and photosynthesis occur smoothly.

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