Practice question
Question
A composite organism is absent from a polluted locality. Its photosynthetic partner supplies food, while its fungal partner provides shelter and absorbs water and minerals. Which conclusion follows?
Explanation
The association is a lichen. The algal phycobiont prepares food, while the fungal mycobiont provides shelter and absorbs water and minerals. Because lichens do not grow in polluted areas, they indicate air pollution.
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