Nucleus , cytoplasm

Nucleus

nucleus is most important part of the cell.

nucleus control all the activities of the cell.

location:-

nucleus is present in the centre  in animal cell ,while in animal it lies in the side of cell because of presene of larhe central vacuole.

nuclear envolpe :-

nucleus is surrounded by double membrane called nuclear envolpe.

this membrane is porous too.

             A granular matrix called nucleoplasm is presentb within the nucleus which contain one or top nucleoli and chromosome.chromosome are more visisble in a dividing cell while they appear as a network of finr threads in the non dividing cell.

number of chromosome :-

the number of chromosome is always specific within a cell of a speceis.

e.g

human cell contain 46 chromosome

onion cell contain 16 chromosome

radish cell comtain 18 chromosome

       chromosome occure in pair in a dipload cell.chromosome is composed of protein and dna .Dna is hereditary material.

function:-

nucleus is called brain of the cell because it control all thr function if the cell.

necleus contain dna and dna is herditory materail.

process of replication occure within the cell

process of sysnthesis of messenger rna occure within the cell.

   (nucleus is present in eukaryotic cell while absent in prolaryotic cell)

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2)cytoplasm

Cytoplasm is present in between the cell membrane and nuclear membrane.

It is an aqueous substance which cotain a variety of cell organelles insoluble waste and fundamental biochemical of life .

It has two parts soluble and insoluble.

It also has a skeleton of very fine fibres.it has about 90% water and forms solution.

It acts as a store house of vital chemical.

It provide a site for various biochemical activities 

E.g glycolysis.

Cytoplasm contain various cell organelles such as mitochondria, golgi bodies ribosomes, endoplasmic reticulum, plastics etc organelles.