two leaves A and B, each having the petiole in a closed test tube full of water. Each is hung on a spring balance. Leaf A has a waxy cuticle on the upper epidermis and stomata on the lower epidermis. Leaf B a waxy cuticle on the upper epidermis and a lower epidermis covered with petroleum jelly. Both leaves were cut from the same plant. i)Explain why it is important for the leaves to be cut from the same plant. (ii) List TWO variabes that must be kept constant in this investigation. iii) Table 6 shows the results obtained in the experiment: leaf and test tube weight final weight change in weight A 40.7 39.9 0.8 B 38.7 38.7 0.0 Explain why the weight of set up A, decreased. iv) Using your biological knowledge, indicate how results will change, if a fan is switched on near the experimental set up. Explain your answer.
two leaves A and B, each having the petiole in a closed test tube full
of water. Each is hung on a spring balance. Leaf A has a waxy cuticle on the upper epidermis
and stomata on the lower epidermis. Leaf B a waxy cuticle on the upper epidermis and a
lower epidermis covered with petroleum jelly. Both leaves were cut from the same plant.
i)Explain why it is important for the leaves to be cut from the same plant.
(ii) List TWO variabes that must be kept constant in this investigation.
iii) Table 6 shows the results obtained in the experiment:
| leaf and test tube | weight | final weight | change in weight |
| A | 40.7 | 39.9 | 0.8 |
| B | 38.7 | 38.7 | 0.0 |
Explain why the weight of set up A, decreased.
iv) Using your biological knowledge, indicate how results will change, if a fan is switched
on near the experimental set up. Explain your answer.
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