Class 12 Biology Ecology Kingdom - Monera And Viruses
Nuclear membrane is absent in
(a)
Penicillium
(b)
Agaricus
(c)
Volvox
(d)
Nostoc
Correct answer: (d) 
Solution: Nostoc is a prokaryote. Prokaryotic cells lack membrane bound organelles and well organised nucleus, i.e. nuclear envelope is absent. Penicillium, Agaricus and Volvox are eukaryotic.

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