A student carried out an experiment to study the uptake of substance X by root tissue of a plant. He immersed that four identical cubes of plant tissue into beakers of solutions. The solutions have the same concentration of substance X but different concentration of oxygen. The table below shows the results.
Concentration of oxygen (arbitrary unit) Rate of uptake of substance X (arbitrary unit)
0 7
5 29
10 90
20 100
a) The student concluded that the tissue takes in substance X by diffusion and active transport. Do you agree ? Give evidence to support your answer.
b) How would the rate of uptake of substance X change if cyanide is added to the solution ? Explaine why.
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