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AQA A Level Biology - Energy and Ecosystems Questions and Answers

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AQA A Level Biology - Energy and Ecosystems Questions and Answers

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AQA AS LEVEL/ AQA A LEVEL

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AQA AS LEVEL/ AQA A LEVEL

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Institution: AQA AS LEVEL/ AQA A LEVEL
Course: AQA AS LEVEL/ AQA A LEVEL

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Uploaded on: May 9, 2025
Number of pages: 2
Written in: 2024/2025
Type: Exam (elaborations)
Contains: Questions & answers

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aqa a level biology energy and ecosystems questi

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AQA A Level Biology - Energy and
Ecosystems Questions and Answers
WhereAdoAorganicAcompoundsAcomeAfromAinAanAecosystem?A-ACORRECTAANSWERSA-
PlantsAsynthesiseAorganicAcompoundsAinAphotosynthesisAusingAatmosphericAorAaquaticA
CO2
WhatAareAmostAofAtheAsugarsAproducedAinAphotosynthesisAusedAforA?A-
ACORRECTAANSWERSA-RespirationA(asArespiratoryAsubstrates)

WhatAareAtheAtwoAusesAofAorganicAcompoundsAproducedAinAphotosynthesisA?A-
ACORRECTAANSWERSA-RespiratoryASubstrates

BuildingAotherAbiologicalAmoleculesAe.g.Acellulose
WhatAisAbiomassA?A-ACORRECTAANSWERSA-
TheAmassAofAlivingAmaterialAorAtheAchemicalAenergyAstored
(i.e.AtheAbiologicalAmoleculesAproducedAbyAphotosynthesisAthatAaren'tArespired)
WhatAareAtheAtwoAwaysAinAwhichAbiomassAcanAbeAmeasured?A-ACORRECTAANSWERSA-
MassAofAcarbonAinAaAgivenAarea,AperAunitAtimeA
DryAmassAofAtissueAinAaAgivenAarea,AperAunitAtime
HowAcanAtheAchemicalAenergyAstoreAinAdryAbiomassAbeAmeasuredA?A-
ACORRECTAANSWERSA-CalorimetryA:

BurnAsampleAofAdryAmassA
(energyAreleasedAheatsAwater)A
ChangeAinAtemperatureAofAwaterAusedAtoAdetermineAchemicalAenergy
HowAcanAtheAdryAmassA(biomass)AofAaAtissueAbeAfoundA?A-ACORRECTAANSWERSA-
DryAaAsampleAinAanAovenAatAaAlowAtemperatureA
WeighAatAregularAintervalsAuntilAconstantAmass
WhyAisAdryAmassAusedAinsteadAofAwetAmass,AasAaAmeasureAofAbiomassA?A-
ACORRECTAANSWERSA-TheAwaterAcontentAofAlivingAtissueAvaries

WhyAisAbiomassAmeasuredAoverAaAparticularAperiodAofAtimeA?A-ACORRECTAANSWERSA-
BiomassAchangesAoverAtimeAe.g.AtreesAwhenAleavesAareAshed
WhatAisAgrossAprimaryAproductionA(GPP)A?A-ACORRECTAANSWERSA-
TheAchemicalAenergyAstoredAinAplantAbiomass,AinAaAgivenAareaAorAvolume,AperAunitAtime
WhatAisAnetAprimaryAproductionA(NPP)A?A(3Athings)A-ACORRECTAANSWERSA-
1.ATheAchemicalAenergyAstoredAinAplantAbiomassAonceArespiratoryAlossesAtoAtheAenvironm
entAhaveAbeenAtakenAintoAaccountA
2.ATheAenergyAavailableAtoAtheAplantAforAgrowthAandAreproduction
3.ATheAenergyAavailableAtoAorganismsAatAtheAnextAtrophicAlevel
WhatAisAtheAformulaAforANPPA?A-ACORRECTAANSWERSA-NPPA=AGPPA-AR
WhatAisAtheAdiffereneAbetweenAnetAprimaryAproductionAandAnetAproductionA?A-
ACORRECTAANSWERSA-NetAprimaryAproductionAisAplants

NetAproductionAisAconsumers
GiveAwaysAwhyAnotAallAchemicalAenergyAisAtransferredAtoAtheAnextAtrophicAlevel?A-
ACORRECTAANSWERSA-1.ANotAallAtheAfoodAisAeatenA(i.e.ArootsAandAbones)

2.ASomeAisAindigestibleAandAegestedAasAfaeces

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AQA A Level Biology - Energy and Ecosystems Questions and Answers

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