Ulothrix is:

Nonmotile colonial alga lacking reproductive stages

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Filmaentous alga with nonflagellated reproductive stages

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Membranous alga producing zoospores

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Filmaentous alga with flagellated reproductive stages

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Solution

The correct option is D Filmaentous alga with flagellated reproductive stages
Ulothrix, the genus of filamentous green algae (family Ulotrichaceae) found in marine and fresh waters. Ulothrix reproduces vegetatively by fragmentation, asexually by nonmotile resting spores (aplanospores) and sexually by biflagellate.
So, the correct option is 'Filamentous alga with flagellated reproductive stages'.

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