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Which of the following pairs is of unicellular algae?

1. Gelidium and Gracilaria
2. Anabaena and Volvox
3. Chlorella and Spirulina
4. Laminaria and Sargassum

Correct answer: Chlorella and Spirulina

Solution

Chlorella is a unicellular green alga, and Spirulina is a filamentous cyanobacterium often grouped with algae in basic biology texts. The other options include multicellular seaweeds or colonial forms, so they do not fit the unicellular pair.

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