Which of the following is known as pond silk?
- ASpirogyra
- BUlothrix
- CNostoc
- DAnabaena
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From which of the following algae,agar-agar is commercially extracted?
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$I.$ Gracilaria $II.$ Fucus $III.$ Sargassum $IV.$ Gelidium $V.$ Turbinaria
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Which of the following algae is a blue-green alga?
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