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Ulothrix can be described as a:

1. non-motile colonial alga lacking zoospores
2. filamentous alga lacking flagellated reproductive stages
3. filamentous alga with flagellated reproductive stages
4. membranous alga producing zoospores

Correct answer: filamentous alga with flagellated reproductive stages

Solution

Ulothrix is a green alga that grows as unbranched filaments. It produces flagellated reproductive stages such as zoospores, so it is not non-motile and not lacking flagella.

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