Definition :- Cell is the structural and function unit of living organism.
Discovery of cell
Robert Hooke :- He discovered the cell from thin “cork”slice and name as cellula. this is published in him book “micrograpghia”.
Robert Brown :- He discovered the nucleus the “nucleus” from “orchid root.”
Dujardin :- He discovered protoplasm.
Purkinje :- He coin the term Protoplasm.
R.virchow :- Given the “omnis cellula’ e’ cellula, mean new cell ariese always from pre existing cell.
Huxley :- He called “protoplasm is the physical basis of life”.
It was formulated by two biologist “m.j.schleiden (1838),and “T. Schwann”(1839).
According to them ‘the cells the structural and functional unit of all living beings’.
But the cell theory expanded by ‘VIRCHOW’, cell theory state that.
1. bodies of the living beings are made up of cells. the cell is the unit of life
2. Activities of an organism are the sum total activities of its cell.
3. Every new cell arises from pre existing cell..
Exception of cell theory
Aim-to Demonstrate Plant Cell
Method :– Separate out a thin onion scale from an onion.
Tear it from the concave side so we get a thin membrane that is call peel or epidermis of onion.
Now keep it onion peel in a watch glass containing water to prevent drying and folding.
Cut out a piece of onion, place it on a glass slide containing some drop of water.
Put some drop of sefranin stain remove extra stain.