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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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September 4, 2023
Number of pages
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Written in
2021/2022
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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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A* A-level Comprehensive Revision Notes

Hi! I am a medical student at the University of Liverpool, selling my A* A-level Revision notes for Biology (possibly more subjects to follow). My notes are made using the specification as well as classroom learning and my own research to ensure nothing was ever missed. Happy Studying!

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