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Which of the following pairs is of unicellular algae :

(1) Laminaria and Sargassum

(2) Gelidium  and Gracilaria

(3) Anabena and Volvox

(4) Chlorella and Spirulina

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Ans: (4) Chlorella and Spirulina

Explanation: Chlorella and Spirulina are unicellular green algae, which are commercially very important.

Anabena is cyanobacteria, Laminaria, Sargassum, Gelidium, Gracilaria are multicellular algae.

Volvox is unicellular colonial algae.

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