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Summary Biology GCSE AQA Ecology 7.3-7.5 notes
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Summary notes for Biology GCSE AQA Ecology 7.3-7.5 according to the specification.
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Topic 7 -Ecology
7.3
Biodiversity and the effect
ofhuman interaction
-
on
ecosystem
7.4 Trophic levels an
in
ecosystem.
-
-7.5Food production. (Sir
only s
7.3
Blodiversity
Bodiversity -
the
is
variety
ofall the different
species of
Earth. I within ecosystem.
organisms on an
Benefit
of
ensuring a
greatblodiversity. (
x3)/
interdepend
~medicine from
helps ecosystems to
stay stable
·
as specks comes
·species provide
specificservices like pollination. wild species.
blodiversity,
human activities REDUCE
~
and at risk
blodiversity
put
thisaffects the distribution of
specks
to like
ecosystem
->
changes an
food a food chali
avallabilityof
avallabilityof
water (clean)
main
·habitat
x 3 reasons temperature 2 These changes are caused b
I
atmosphericgases. both natural, human factors
↑ -
how human activities are O
-
geographicactivities
I arman interaction
blodiversity? ⑦
reducing season changes. pollution
↳ human activities overexploitation.
① Demand
or d amage the environment.
E
the
human demands for
rapid growth population higher
As
in means resources.
of individual
increase In standards /
quality living means each
puts more pressure on the environment
/ goods
X likephones.
cars, consumer
Apopulation demand 84
+
*mal cause.
② Pollution
3
from hunting
more resources used. kills plants animals,
-
+
↳ ③ overexploitation habitat, causing extinction
more waste produced. to destroying
and reduces
blodwersity.
, & Pollution In water, all, land.
->
as more resources are used and m o re waste
produced from the
is
demand from the population and its increasing
growing increasing
standards of
living, pollution c an occur inwater, air and land
In water,
polluting lakes, rivers, oceans
from or toxicchemicals from factories
fertilizer
sewage,
and farmers
I
-
Lomes - >
affects the marine life,ecosystem.
In alm I combustion
I smoke, andligases (
from
gases
from
like methane, sulfur dioxide fossil fuel burning
and cattle -> dissolves molstore
forming in
causing
and and harms organisms
rain,
includinghumans.
On land.
toxicchemicals like
daily rubbish in landfills, nuclear waste and
-
pesticides inthe soll spreads into ecosystems.
surrounding
Larms kills plants indirectly directly,
↳ I
and I animal
-reducing biodiversity.
⑧ Overexploitation. (Deforestation and Land Use)
↓mining
Land Use.
humans reduces amount land avaliable for animals
->
of and plants
by building, farming, quarrying, dumpling waste.
takes a
long biodiverse **R.
Reat
Destroying Boys. to form
~ time very +non-renewable
Peat B useful in
storing carbon,
->
a re
of
decomposition.
slowing acidic
destroying ~
->
Reat peat
Bogs and a re as -
partially
decayed
to produce garden compost (Intilizer) plants
A reduces of
blodiversity
and this
->
area
habitatas
I
Boys provides habitat
peat a moss
-
-
for
many variety specks
animals, microorganism
plants,
of
to
1
destroying peafbogby decaying, burning ofPeat contributing
->
releases
CO2/greenforce gas, to the atmosphere. -global warming,
a
The Iarge amount
oored
of
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