part 1

1. THE
FUNDAMENTAL
UNIT OF LIFE
BY : MISS RITIMA (TGT –
SCIENCE)

2. INTRODUCTION
 ROBERT HOOKE WHILE EXAMINING
THIN CORK OBSERVED THAT THE
CELLS IN CORCK RESEMBLES THE
STRUCTURE OF HONEY COMB
CONSISTING OF MANY LITTLE
COMPARTMENTS.
 IN YEAR 1665 ROBERT HOOKE GET
CHANCE TO OBSERVE THESE CORCK
CELLS THROUGH SELF DESIGNSED
MICROSCOPE . HE CALLED THESE
BOXES CELL.

3. CORK CELL AS DISCOVERED BY ROBERT HOOKE UNDER
HIS MICROSCOPE.

4. CELL THEORY
PROPOSED BY SCHLEIDEN AND
SACHWANN AND FURTHER
ELABORATED BY VIRCHOW.
POSTULATES
 CELL IS THE BASIC UNIT OF LIFE.
 ALL LIVING ORGANISMS ARE MADE UP
OF CELLS.
 NEW CELLS ARISES FROM PRE-
EXISTING CELLS.

5. SHAPE AND SIZE OF CELL
 THE SHAPE OF THE CELL DEPENDS
UPON THE FUNCTION THEY PERFORM.
 SMALLEST CELL -- PPLO
 LARGEST CEL – OSTRICH EGG
 LONGEST CELL -- NERVE CELL

6. DIFFERENT SHAPES AND SIZES OF CELLS FROM HUMAN
BODY

7. STRUCTURAL ORGANISATION OF CELL
 CELL MEMBRANE
 CELL WALL
 NUCLEUS
 CYTOPLASM
 ENDOPLAMIC RETICULUM
 GOLGI APPRATUS
 PLASTIDS
 VACUOLES

8. STRUCTRE OF CELL

9. PROKARYOTIC CELL AND EUKAYOTIC CELL
PROKARYOTIC CELL EUKARYOTIC CELL
 SIZE IS GENERALLY
SMALL.
 NUCLEUS IS ABSENT.
 SINGLE PRO
CHROMOSOME IS
PRESENT.
 MEMBRANE BOUND
ORGANELLES ABSENT.
 70s RIBOSOMES ARE
PRESENT.
 EXAMPLES: BACTERIA ,
CYNOBACTERIA
 SIZE IS GENERALLY
LARGE.
 NUCLEUS IS PRESENT.
 MORE THAN ONE
CHROMOSOMES.
 MEMBRANE BOUND
ORGANELLES PRESENT.
 80s RIBOSOMES ARE
PRESENT.
 EXAMPLES : PLANTS ,
ANIMALS , FUNGI ,
PROTISTS.

11. FEW IMPORTANT QUESTIONS:
Q1: Who discovered cell?
Q2: State cell theory.
Q3: Name smallest cell.
Q4: Differentiate between plant cell and animal
cell.
Q5: Draw labelled diagram of cell.