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turmeric powder is the natural indicator
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question 1) what are lichens?
ans Lichens are compound plants as algae and fungi live together in close association, as a result of which both are benefited. This relationship is called symbiosis. They occur as greyish green growths on rocks, bark of the tree or on the ground.
question 2) name some natural indicators
ans some natural indicators are
1) turmeric
2) methyl orange
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