Algae are useful because they -

Purify the atmosphere

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Are large in number

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Are used in fermentation

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Are used to study respiration

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Solution

The correct option is A Purify the atmosphere
Algae is a collective term for all those chlorophyll bearing organism which are thalloid. So, during photosynthesis by taking in $C O_{2}$ and giving out $O_{2}$ , they purify the atmosphere.
So, the correct answer is 'purify the atmosphere'.

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