CAIE A Level Biology 9700 · Transport in plants

Transport in plants: compare question

Compare5 marksStandard

A student examined transverse sections of leaves from two plants: Species X, a xerophyte adapted to arid conditions, and Species Y, a mesophyte from a temperate woodland. The following features were noted in Species X: a thick layer of cuticle on the upper and lower epidermis; the stomata are located in pits (sunken stomata) on the lower surface; the leaf is rolled with the lower surface facing inward, and there are numerous trichomes (hairs) lining the stomatal pits. Species Y has a thin cuticle, stomata on both surfaces, and a flat leaf blade.

Compare the adaptations of the xerophyte leaf to those of the mesophyte leaf in terms of reducing water loss from transpiration.

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5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.

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