Question 30
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. Where two leaves had the same treatment, calculate the mean change in mass for those two leaves, and add this to your table.
