(D) is the correct answer.In the experiment with $Hydrilla$,adding sodium bicarbonate $(NaHCO_3)$ increases the availability of carbon dioxide $(CO_2)

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Amount of oxygen evolved increases as the availability of carbon dioxide increases.

(D) is the correct answer.In the experiment with $Hydrilla$,adding sodium bicarbonate $(NaHCO_3)$ increases the availability of carbon dioxide $(CO_2)$ in the water.$CO_2$ is a key substrate for photosynthesis.This enhanced availability of carbon dioxide improves the rate of photosynthesis,which,in turn,increases the amount of oxygen $(O_2)$ evolved as a byproduct.

Class 11 Biology Photosynthesis in Higher Plants Factors affecting photosynthesis

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In an experiment demonstrating the evolution of oxygen in $Hydrilla$,sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable?

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A
Amount of oxygen evolved decreases as the availability of carbon dioxide increases.
B
Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate.
C
Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate.
D
Amount of oxygen evolved increases as the availability of carbon dioxide increases.