In an experiment to investigate transpiration, the leaves of four identical shoots are treated in the following ways: 1 upper surfaces coated with waterproof jelly, 2 lower surfaces coated with waterproof jelly, 3 both upper and lower surfaces coated with waterproof jelly, 4 left untreated. The graph shows the amount of water lost by the four shoots. Which line represents the result for shoot 4?
Biology 5090 · O Level · Transpiration and translocation