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Summary AQA A-level Biology: Energy and Ecosystems Revision Notes

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These are full comprehensive notes on the entire Module of Energy and ecosystems for the AQA A-level specification. They are written using a mixture of my own research, class learning and the specification. They include diagrams, step by steps and everything I needed to get an A* in A-level Biology.

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, Plants , & biomass
energy




used 7 the plant convert
glucose can be can



^
in respiration it into insoluble starch




How does a plant use

e
?
the
glucose can be used to glucose
S

make cellulose for tough cell the
glucose c a n be




walls
&
used to make lipids for

the convert
plant can the
storage

into amino acids to make
glucose


proteins

>
to make amino acids, the plant


must also need nitrate ions from t h e


soil




definition biomass > the to t a l m a ss of living material in a specific a re a at a specific time . It can be a




m e a s u re of carbon or m a ss of living tissue in a
given a re a .




" " "" "" " """ " "←




^①
"




.IE/-:-i
ignition wires an electrical cur rent is passed through the wires
sample to bur n
causing the

*




thermometer ( very accurate to measure the

temperature of the wa te r )

stir rer


ensures h e a t i s evenly distributed
the water
through of the
oxygen ensures all sarnie is burnt

vessels




sample of dehydrated tissue

, Energy Loss in Food chains


eg incomplete
gdigestion
.



9
ingestion movement
r



wheat 9 cattle → humans

← t respiration →
reproduction
respiration of
production a

biological excretion

Molecules
disease




efficiency energy used for growth (biomass



(
energy supplied energy
available
from ecosystem)



equation In Plants :




NPP =
GPP -
R
a n n

respiratory
netprimarg
production
gross losses
primary
production


In Animals :


ingested


equation N = I -
(F t R)
^ n n



net faeces respiratory
production Irene losses




ingest taking in food and therefore energy


digest break down
large molecules into smaller molecules




definitions egest forceable removal of indigestible organisms .




exc re te removal of waste products produced by an
organism

secrete substance produced and released from a cell /gland




energy is lost at each trophic level due to a
range of factors . This limits the
length of food chains .




To minimise losses :
energy

*
limit movement of animals



*
keep animals war m




*
minimise disease → vaccination & isolation




All the
energy in a food chair
originates from the s u n .

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