Short Notes of chapter - cell

PRASHANT KIRAD




FUNDAMENTAL
FUNDAMENTAL


UNIT OF LIFE
UNIT OF LIFE



Class-9th Science
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A cell is the basic structural and functional unit of life, capable of performing all
essential life processes. Hence, it is called the fundamental unit of life.


Cell - Robert Hooke (1665) Discovered protozoa and bacteria, living cell - Antonie van Leeuwenhoek (1674)


Protoplasm - Purkinje (1839) Cell nucleus - Robert Brown (1831)



Cell is the building block of life

Cell → Tissue → Organ → Organ System → Organism
Schleiden (1838) – Said plants are made of cells
Cell Theory Schwann (1839) – Said animals are made of cells
Rudolf Virchow (1855) – Said new cells come from old cells


All living things are made of cells
Cell is the basic unit of life
New cells come from pre-existing cells

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Cell



Size Number Shape


Unicellular - single cell


Multicellular - more the one cell

Mycoplasma Ostrich egg


Smallest Largest




Smallest cell – Sperm cell

Humans
Largest cell – Ovum (female egg cell)