Slides in this set
All organisms are classified in to 5 kingdoms which are:-
· Plants- Plants are autotrophs meaning that they produce
their own food via photosynthesis. Plants are multi cellular
and have a cellulose cell wall as well as chlorophyll (absorbs
light for photosynthesis). E.g. fern, coriander, weeds etc.
· Animals- Animals are hetrotrophs meaning the have to
move to feed. They are also multi cellular however they
don't have a cell wall or chlorophyll. E.g. lion, cat, cow etc.
· Fungi- Fungi are saprophytes meaning they feed of
decaying material and dead organisms. They are multi
cellular, don't have chlorophyll but have a cell wall which
isn't made or cellulose. E.g. mushrooms, moulds etc.
· Protocists- Protocists are unicellular and have a nucleus. E.
· Prokaryotes- Prokaryotes are unicellular but don't have a
nucleus. E.g. bacteria…read more
· Kingdom- Move to feed
· Phylum- Have a backbone (Chorodata)
· Class- Have hair/fur and produce milk
· Order- Ape-like animals
· Family- Human-like animals (Homo)
· Genus- Modern day humans (Sapiens)…read more
To classify animals three factors are taken into account:-
· How they maintain the internal temperature of their body-
homeotherms use homeostasis to maintain a steady
temperature in their body (warm-blooded, mammals) and
poikilotherms use the environment around them to change
their temperature (cold-blooded, reptiles).
· How they reproduce- if they use internal fertilisation
(mammals) or external fertilisation (fish). In addition if they
are oviparous, lay eggs (reptiles) or is they are viviparous,
give birth to and suckle live young (mammals).
· How they breath- if they have lungs (birds), gills (fish) or if
they have permeable skin (amphibians).…read more
ACCURACY OF CLASSIFYING
Species are a group of organisms with similar characteristics
that can interbreed to produce fertile offspring. Classifying
species in to categories is not always very accurate because:-
· Not all species reproduce as the definition of species states.
Some reproduce using asexual reproduction but still are the
· Some closely related species interbreed to produce a hybrid
which can sometimes be fertile (ducks). This creates a new
species as they don't belong to either one of their parents
due to variation.
· Some organisms in the same species look widely different
due to variation this makes it difficult to classify these
animals (different breeds of dogs).
· Ring species are when two closely related populations can
interbreed to produce fertile offspring. However the ones
further away can't making it difficult to recognise which
species is which.…read more
· Organisms receive their genes from · The environment people live in
both their mother and father. affect the way the live and grow.
· No two organisms can have the · In some countries due to the lack of
identical genes (unless they are nutrition children won't be able to
identical twins) due to variation. grow as they aren't getting a sufficient
· Genes can also mutate causing amount of food. If the child had the
variation within individuals. A change gene to grow tall then without
in your gene changes your nutrition they wont be able to do so.
characteristics making you different. Overall both the genes and the
· Some characteristics can only be environment affect an individuals
determined by your genes for example characteristics.
inherited disorders (cystic fibrosis), · The characteristics that are
eye colour (blue, green, brown etc). determined by the environment is
having your toe bit of by a piranha or
a suntan. The influences are diet,
exercise etc.…read more