Nucleus was discovered by Robert Brown in 1831.Nucleus is the metabolic centre of eukaryotes and for prokaryotes it is the genophore.Nucleus is the dynamic centre of the cell.

Nucleus is also designated as the 'Director of the cell'.It is the largest organelle in a eukaryotic cell.

The study of nucleus is called Karyology.
Nucleus consists of
a)Nuclear membrane or Karyotheca
b)Nuclear sap or nucleoplasm or Karyoplasm.
d)Chromatin reticulum or Nuclear reticulum

Karyotheca is double membraned .It is porous containing nuclear pores.It provides selective continuity between nuclear and cytoplasmic materials.

Nucleolus is non-membrane bound.It was discovered byFontana.It synthesizes the ribosomes and proteins for the formation of ribosomes .Nuclear material contains chromosomes.Chromosomes are the bearers/vehicles of hereditary instructions and regulation of cellular activities.

Nucleus regulates growth and reproduction of cell.
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The central dense round body in the centre of a cell is called Nucleus.
It is an important component of living cell.
It can be stained and seen easily with microscope.
It is separated from the cytoplasm by a membrane called Nuclear membrane.
This membrane is porous and allows movement of materials between inside of the nucleus and cytoplasm.
A smaller spherical body in nucleus is called nucleolus.
Nucleus contains thread like structures called chromosomes.
These carry genes and help in inheritance or transfer of characters from parents to offsprings.

Hope this may help uu.....
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