Question 34
Eight similar leaves from the same kind of plant are labelled A–H. Apply petroleum jelly as follows: A/B none; C/D upper surface only; E/F lower surface only; G/H both surfaces. Hang the leaves in their original order and compare their measured mass losses after at least one day. Suggest why you used two leaves for each treatment. Would it have been better to use more leaves for each treatment? Explain your answer.
