Answer
The results of the experiment may change if the vines were grown under variable temperatures, as an increase in temperature will increase the rate of plant growth up until an optimal temperature.
Work Step by Step
An increase in temperature will increase the rate of photosynthesis and respiration up to an optimal temperature, which would increase plant growth and change the results of the experiment. After the optimal point the active sites of the enzymes involved in photosynthesis and respiration will begin to denature, meaning they will no longer be able to form substrate-enzyme complexes, reducing the rate of photosynthesis and respitation and decreasing plant growth.
