Question

short note on nucleus

Answer 1

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.
c)Nucleolus
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.

Answer 2

The area at the centre of an atom is represented by a nucleus.

• The compact, dense, positively charged region in the middle of an atom is typically considered to be its nucleus.
• Nucleons, which are the protons and neutrons together, are the building blocks of it.
• The total quantity of protons in the nucleus defines the atomic number of the atom and, consequently, whether or not it qualifies as a separate element.
• The atomic mass of an atom is defined as the sum of all protons and neutrons in the nucleus. The characteristics of an atom's nucleus have a significant role in determining its properties.
• The positive charge of the nucleus attracts and holds the surrounding negatively charged electrons.

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