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AQA A-level Biology - Topic 1B – Water Questions and Answers 2025

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AQA A-level Biology - Topic 1B – Water Questions and Answers 2025

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AQA AS LEVEL/ AQA A LEVEL

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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 topic 1b water questions a

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AQA A-level Biology - Topic 1B – Water
Questions and Answers 2025
WhatApercentageAofAcellsAisAmadeAupAofAwater?A-ACORRECTAANSWERSA-80%
WhyAisAwaterAnecessaryAinAmetabolicAreactions?A-ACORRECTAANSWERSA-
BecauseAwaterAisAaAmetaboliteAinAlotsAofAimportantAmetabolicAreactions,AsuchAasAcondens
ationAandAhydrolysis.
WhyAisAitAusefulAthatAwaterAisAaAsolvent?A-ACORRECTAANSWERSA-
SomeAsubstancesAdissolveAintoAwater,AwhichAisAusefulAbecauseAmostAmetabolicAreactions
AtakeAplaceAinAsolutions.

WaterAqualitiesAofAwaterAaidsAinAtemperatureAcontrol?A-ACORRECTAANSWERSA-
ItAhasAaAhighAlatentAheatAofAvaporisationAandAaAhighAspecificAheatAcapacity.
WhatAwaterAqualityAaidsAwaterAtransportAinAplants?A-ACORRECTAANSWERSA-
WaterAmoleculesAareAveryAcohesive,AmeaningAtheyAstickAtogetherAwhichAaidsAtransportAinA
plantsAandAotherAorganisms.
WhatAisAtheAstructureAofAwater,AandAhowAdoesAitAaffectAtheAchargesAofAtheAelectrons?A-
ACORRECTAANSWERSA-

TheAstructureAofAwaterAisAH2O,AjoinedAtogetherAbyAcovalentAbonding.

TheAsharedAelectronsAfromAtheAhydrogenAareApulledAtowardsAtheAoxygen,AgivingAthatAsideA
ofAtheAhydrogenAatomsAaAslightApositiveAcharge.

TheAunsharedAnegativeAelectronsAonAtheAoxygenAatomsAhaveAaAslightAnegativeAcharge.AT
hisAmakesAwaterAaApolarAmolecule.
HowAdoesAwaterAcohesionAwork?A-ACORRECTAANSWERSA-
TheAslightlyAnegativelyAchargedAoxygenAatomsAattractAtheAslightlyApositiveAchargedAhydro
genAatomsAofAotherAwaterAmolecules,AformingAhydrogenAbonds.
WhatAisAlatentAheatAofAvaporisation?A-ACORRECTAANSWERSA-
ItAtakesAaAlotAofAheatAenergyAtoAbreakAtheAhydrogenAbondsAbetweenAwaterAmolecules,AsoA
waterAhasAaAhighAlatentAheatAofAvaporisationAbecauseAaAlotAofAenergyAisAusedAupAwhenAwa
terAevaporates.
WhyAisAwaterAhavingAaAhighAlatentAheatAofAvaporisationAhelpfulAforAlivingAorganisms?A-
ACORRECTAANSWERSA-

ItAmeansAorganismsAcanAcoolAdownAbyAlosingAwaterAbyAevaporation,AwithoutAlosingAtooAm
uch.
WhyAisAwaterAaAbuffer?A-ACORRECTAANSWERSA-
WaterAisAaAbufferAbecauseAitAcanAresistArapidAchangesAinAtemperature.

ThisAisAbecauseAtheAhydrogenAbondsAcanAabsorbAaAlotAofAenergy,AwhichAgivesAwaterAaAhig
hASHC.
WhyAisAwaterAbeingAaAbufferAusefulAtoAorganisms?A-ACORRECTAANSWERSA-
BecauseAitAmeansAthatAwaterAdoesn'tAexperienceArapidAtemperatureAchange.AWaterAisAthe

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AQA A-level Biology - Topic 1B – Water Questions and Answers 2025

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