A-LevelBiologyBiological moleculesOct/Nov 2021Paper 2 Q410 Marks
In thale cress, Arabidopsis thaliana, most of the stomata are on the lower surface of the leaves. Fig. 4.1 is a diagram of an open stoma and two guard cells. Some of the cellulose fibres in the cell wall of the guard cells are shown. [Figure 4.1]
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