Which of the following pairs represent unicellular algae?

Anabaena and Volvox

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Chlorella and Spirulina

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Laminaria and Sargassum

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Gelidium and Gracilaria

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Solution

The correct option is B Chlorella and Spirulina
Chlorella and Spirulina are unicellular algae, rich in proteins and are used as food supplement even by space travellers. These algae produce a nutritional biomass that astronauts could eat.
Sargassum, Gelidium, Gracilaria, Laminaria are all multicellular algae. Anabaena is a cyanobacteria while Volvox is a colonial alga.

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