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True nucleus is absent in:

1. (a) Mucor
2. (b) Vaucheria
3. (c) Volvox
4. (d) Anabaena

Correct answer: (d) Anabaena

Solution

Anabaena is a cyanobacterium, so it is prokaryotic and does not have a true, membrane-bound nucleus. The other options are eukaryotic organisms and possess a true nucleus.

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