IGCSE Biology Notes pt 1

IGCSE EXAM




BIOLOGY
REVISON
NOTES
Aimee Williams

,1)Living organisms
King Prawn
MRS Curry Or Fried
GREN Greasy Sausage
M ovement K ingdom
Respiration Phylum
Sensitivity C lass
O rder
Growth
F amily
Reproduction
G enus
E xcretion Species
Nutrition

Linnaean SystemBinomial Naming
Structure
First Name=Genus
Second Name=Species

, Kindoms
At the broadest level, organisms can be classified
into 5 kingdoms; animals, plants, fungi,
prokaryotes and protoctista.

Animals
Animal cells have no cell wall and no
chloroplasts (so do not carry out
photosynthesis).Animals are multicellular
(made of many cells) and they are
heterotrophs (don't make their own
food).Whales and worms are examples.

Plants
Plant cells are surrounded by cell walls
(made of a substance called cellulose) and
contain chloroplasts (carry out
photosynthesis).Some plants are
multicellular (many cells) and some are
unicellular (single-celled), and they are all
autotrophs (make their own food).Daisies
and algae are examples.

, Fungi
Fungi cells have cell walls (that do not contain
cellulose) and no chloroplasts.
Fungi are decomposers (get their food from
decaying matter), and can be multicellular or
unicellular.
Mushrooms and moulds are examples.


Prokaryotes
Prokaryotes are unicellular and have no
nucleus (membrane-bound structure that
contains the cell's genetic materials).
Bacteria are prokaryotes.


Protoctista
Protoctista are unicellular, and their cells
have nuclei (membrane-bound structures that
contain the cell's genetic materials).
Amoeba are an example.