A primitive filament is formed in protist

Gonyaulax

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Gymnodinium

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Melosira

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Pinnularia

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Solution

The correct option is D Melosira
Diatoms have cell wall made of silica which have also primitive filament. Melosira is a kind of diatoms which is found in benthic habitats in rivers, lakes, etc. Their cells are joined with long filamentous chains.
So, the correct option is option C.

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