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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