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B
Gracilaria and Chlorella
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C
Gelidium and Spirulina
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D
Laminaria and Sargassum
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Solution
The correct option is A Anabaena and Volvox Filamentous forms are Anabaena, Spirulina, Laminaria and Sargassum.
Colonial alga is Volvox.
Multicellular algae are Gracilaria and Gelidium.