A well-defined nucleus is absent in

Nostoc

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Paramoecium

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Slime moulds

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Yeast

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Solution

The correct option is A Nostoc
A well-defined nucleus is absent in prokaryotes. Prokaryotes have their genetic material in the form of naked circular DNA present in a region called the nucleoid.
Nostoc is a prokaryote and it lacks a well-defined nucleus.

Paramoecium, slime moulds and yeast are eukaryotes with a well-defined nucleus.

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A well-defined nucleus is absent in:

Cells with a well-defined nucleus are called______a_____and cells without a well-defined nucleus are called_____b_____.

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