6.2. Leaf structure
A subsection of Biology, 0610, through 6. Plant nutrition
Listing 10 of 201 questions
Scientists investigated the effect of cuticle thickness on water loss from the leaves of the balsam fir tree, Abies balsamea. The leaves were divided into three groups: A – thick cuticle B – medium cuticle C – thin cuticle Samples of leaves from each group were weighed. The leaves were placed on a tray in dry air at 20 °C. The samples of leaves were reweighed, at intervals, over 15 hours. The scientists calculated the mass of each sample of leaves as a percentage of the initial mass. shows the results. mass of the leaves as a percentage of the initial mass time / hours A B C Describe and explain the results shown in . The investigation was repeated on a day when the air humidity was higher. Suggest and explain the effect that this would have on the results. The leaves of pine trees show xerophytic features. Stems and roots also show xerophytic adaptations. State one adaptation of the stem and one adaptation of the root in xerophytes. stem root Water is one of the raw materials needed for the production of sugars in photosynthesis. State the name of the other raw material needed for photosynthesis. State three ways a plant uses the sugars produced in photosynthesis.
0610_m19_qp_42
THEORY
2019
Paper 4, Variant 2
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