O-LevelBiologyTransport in Plants5090/21 · May/June 2018 · Q610 Marks
The diagram shows a magnified transverse section through a leaf. Name each of J, K, L and M and explain the importance of each in the process of transpiration.
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.
- [10] (J) cuticle; waterproof/waxy AW ; prevents / reduces + water loss / transpiration / evaporation; (K) xylem; transport + water; from named location to named higher location; (L) spongy; air/intercellular + spaces ; water film AW ; evaporation / water vapour; diffusion; (M) stoma / stomata ; guard cell; open / close; reference to water vapour + exits ; diffusion;
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