Question

explain the structure of nucleus and draw its structure

Answer 1

The structure of nucleus is spherical and in animal cell it is located at the center and in plant cell it is located at a side due to vacoules and nucleus has a net like structure called chromatin net which carries gene and nucleus also has a dark spherical body called nucleolus, nucleus is covered by a membrane called nuclear membrane which is porous and allows exchange of material between nucleus and cytoplasm, nucleus is filled with a fluid called nucleoplasm , in addition nucleus also has some false nucleolus

Answer 2

Nucleus, the control centre of the eukaryotic cells. Firstly, it is itself a cell organelle covered by nuclear envelope and envelope having nuclear pores for the transport of substances in and out of the nucleus.
It mainly contains genetic materials in the form of DNA.
It posses a dark material inside its nucleoplasm called nucleolus where gnetic material is stored in the form of chromatin thread.

That's all about nucleus I know!
I hope that this will help u :)