(B) The nucleolus is a non-membrane-bound structure present within the nucleus. It is not separated from the nucleoplasm by any membrane or envelope.

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It is separated from the nucleoplasm by a nuclear envelope.

(B) The nucleolus is a non-membrane-bound structure present within the nucleus. It is not separated from the nucleoplasm by any membrane or envelope. Therefore,the statement that it is separated from the nucleoplasm by a nuclear envelope is incorrect.

Class 11 Biology Cell: The Unit of Life Nucleus and Chromosomes

Medium

Which of the following statements is incorrect in relation to the nucleolus?

A
It is a spherical structure.
B
It is separated from the nucleoplasm by a nuclear envelope.
C
It is the site of $rRNA$ synthesis.
D
They are larger and more numerous in cells actively engaged in protein synthesis.