A-LevelBiologyBiodiversity and conservationOct/Nov 2024Paper 4 Q99 Marks
Lichens are found growing on trees, walls, rocks and soil. Fig. 9.1 shows a lichen of the genus Usnea. Usnea can tolerate only low concentrations of sulfur dioxide and does not grow in places where the air is polluted with sulfur dioxide. [Figure 9.1] Usnea is composed of a mixture of two types of cell: • photosynthetic cells that are classified in the kingdom Protoctista • fungal cells that are classified in the kingdom Fungi.
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