Which one of the following is a unicellular, non motile desmid?

Chlorobium

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Clostridium

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Chromatium

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Cosmarium

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Solution

The correct option is D Cosmarium
Cosmarium Cosmarium is unicellular placoderm desmid. Cells are divided in middle by isthmus. The nucleus is situated in the isthmus. It is nonmotile due to lack of locomotory appendages. Clostridium is Gram +ve anaerobic bacteria. Chromatium is Gram -ve photoautotrophic bacteria found in water. Chlorobium is green sulphur bacteria.
Thus, the correct answer is option D.

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