O-LevelBiologyPlant Nutrition5090/22 · May/June 2018 · Q610 Marks
The diagram shows a magnified transverse section through a leaf. [Figure: Magnified transverse section through a leaf showing T, U, V, W]
- Name each of T, U, V and W and explain the importance of each in the process of photosynthesis.[10]
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] Note marking points must not be transferred between the sections of this question
- (T) 1 palisade ;
- 2 chloroplasts / chlorophyll ;
- 3 absorb AW + light ;
- (U) 4 phloem ; R xylem in point 4
- 5 transport AW / translocate + sugars / sucrose / amino acids ;
- 6 from source to sink ORA or from named location to named location ;
- (V) 7 spongy ;
- 8 air / intercellular + spaces ;
- 9 gas exchange / diffusion AW ;
- 10 carbon dioxide + in or oxygen + out ;
- 11 chloroplasts / chlorophyll ;
- 12 absorb AW + light ;
- (W) 13 stoma / stomata ; A marking points 9 and 10 under (W)
- 14 guard cell ;
- 15 open / close ;
- 16 transpiration + supply of water ;
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