True nucleus is absent in:

Volvox

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Anabaena

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Mucor

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Vaucheria

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Solution

The correct option is B Anabaena
Anabaena is a genus of filamentous cyanobacteria that exist as plankton and it belongs to the kingdom bacteria. Bacteria are prokaryotic and do not have a true nucleus. Volvox(algae), Mucor(fungi), and Vaucheria(algae) are all eukaryotes which have a true nucleus.

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In eukaryotic cell a true nucleus is absent.

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