What is cell?
Definition :-
Cell is the basic structural and functional unit of all living organism.cell act as a building block of all organism.
Explanation
All organism are made from cell.cell is the building block of all organism.
Some organism are made from one cell while some are made from many cells.
Unicellular organism
Those organism which are made from only one cell are called unicellular organism
Multicellular organism
Those organism which are made from many cells are called multicellular organism.
2)cell theory
Two scientists
Schwann and shleiden presented a theory about cell which are called cell theory.
Main points of cell theory
They presented main points about cell theory which are give below
A)All animals and plant's are made up of cell and cell products. Some organism are unicellular and some are multicellular.
B) cell are the structural and functional unit of living organism.
C) new cell arise from the preexisting cell by cell division.
Maine cell components
Every cell have three main components
1)cell membrane(plant have cell wall too)
2) cytoplasm
3)necleus
Cell membrane is the outer most layer of animal cell it protect inner cell material from external environment .in plant it lies next to cell wall .
Cytoplasm is present in every types of cell .cytoplasm contain cell organelles. Exchange of materials on cell also occurs by the way of cytoplasm
Necleus is present in eukaryotic while absent in plant cell.necleus contain genetic materials like DNA .necleus control all the activities of the cell.
3)Types of cells
There are two types of cells
1)prokaryotic cell
2)eukaryotic cell
a) prokaryotic cell
Prokaryotic CEll are simple and don't contain all the cell organelles like eukaryotic cells. Prokaryotic cell don't have nucleus and are smaller in size 0.5mm .
E.g bacteria and cyanobacteria
Prokaryotic cell components
Cell membrane ,cytoplasm and some other few organelles
b)eukaryotic cell
They are very complex and contain all the cell organelles .
Eukaryotic cell have nucleus.
It is larger in size 10-100nm
Ribosomes are larger in size.
E.g protists fungi plant and animals.
Eukaryotic cell components are
Cell membranes , cytoplasm ,nucleus , mitochondria , ribosomes, golgi body,endoplasmic reticulum,cell wall ,microtubules.
Structure of plant cell
Its contain
1)cell wall (2) cell membrane (3)golgi body (4)chloroplast (5)vacule membrane (5)raphid Crystal (6)druse crystal (7)mitochondria (8)cytoplasm (9) amyloplast (10) large central vacule (11)endoplasmic reticulum (12)nucleus (13) golgi vessles (14) ribosomes
Herr is diagram
Structure of animal cell
(1)golgi bodies (2) mitochondria 3 necleus 4 microtubules 5 cytoplasm 6 ribosomes 7 centrioles 8 cell membrane 9 endoplasmic reticulum 10 lysosome
They contain cell wall too while cell wall I'd absent in animal cell
Here is diagram
