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Summary Biodiversity revision notes for Biology A level OCR
In depth revision notes covering the whole of biodiversity. The topic is broken down into the individual specification points, shown by the numbers used throughout.
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, H 2 1 BIODIVERSITY: .
↳ the variety of living
organisms in an
area
Habitat diversity :
· habitat area inhabited by
=
a species
.
·
physical factors . soil t temperature range
g e .
·
. availability of food , predators
Biotic factors e g .
·
The number of different habitats in an area
↳ coastal areas have beaches , sand dures ,
solt mashes etc
.
↳ River valleys have meadows agricultural ,
woodlands etc .
T
funds , streams,
species diversity :
species = group of sumiar organisms that are
able to reproduce to give fertile offspring
.
·
The number of different speces (species
richness) - the abundance of each Ispec's
ispecies evenness) in an area
.
↑ A Woodland contains many different
species of plants insects , birds mammals ,
Genetic diversity :
·
The variation of alleles within a species or a
population of a species
- human blood type is determined by a
gene with 3 different aleles
↳ The variation of aleks within the dog
species guie rise to different breeds
&
.
↑ poodle
e
. Pug
g .
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