Botany - Cell - The Unit of Life Question with Solution | TestHub

Nucleolus is a rounded structure present inside nucleus, having rRNA.

First observed by Fontana in the skin cells of eel. Term nucleolus was coined by Bowman. Microscopic structure was given by Wagner.

It is associated with nucleolar organizer region of the nucleolar chromosome.
No covering membrane around nucleolus. Nucleolus has four components-amorphous matrix, granular portion, fibrillar portion and chromatin portion, Nucleolus consists of homogeneous matrix called pars amorpha. it contains scattered granules and fibrils Generally, two nucleoli are present in each cell but number may vary.

∙  Functions :

⋆  It is store house of RNA.

⋆  It produces and stores ribosomal RNA.

⋆  It forms the units of ribosomes