AQA A Level Biology - Energy and Ecosystems questions and answers 100% verified.

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AQA A Level Biology - Energy and
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Ecosystems questions and answers 100%
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Where sdo sorganic scompounds scome sfrom sin san secosystem? s- s scorrect sanswer. s s
sPlants ssynthesise sorganic scompounds sin sphotosynthesis susing satmospheric sor

saquatic sCO2 s
s

What sare smost sof sthe ssugars sproduced sin sphotosynthesis sused sfor s? s- s scorrect
sanswer. s s sRespiration s(as srespiratory ssubstrates) s
s

What sare sthe stwo suses sof sorganic scompounds sproduced sin sphotosynthesis s? s- s
scorrect sanswer. s s sRespiratory sSubstrates s

Building sother sbiological smolecules se.g. scellulose s
s

What sis sbiomass s? s- s scorrect sanswer. s s sThe smass sof sliving smaterial sor sthe schemical
senergy sstored s

(i.e. sthe sbiological smolecules sproduced sby sphotosynthesis sthat saren't srespired) s
s

What sare sthe stwo sways sin swhich sbiomass scan sbe smeasured? s- s scorrect sanswer. s s
sMass sof scarbon sin sa sgiven sarea, sper sunit stime s s

Dry smass sof stissue sin sa sgiven sarea, sper sunit stime s
s

How scan sthe schemical senergy sstore sin sdry sbiomass sbe smeasured s? s- s scorrect
sanswer. s s sCalorimetry s: s

Burn ssample sof sdry smass s s
(energy sreleased sheats swater) s s
Change sin stemperature sof swater sused sto sdetermine schemical senergy s
s

How scan sthe sdry smass s(biomass) sof sa stissue sbe sfound s? s- s scorrect sanswer. s s
sDry sa ssample sin san soven sat sa slow stemperature s sWeigh sat sregular sintervals

suntil sconstant smass s
s

Why sis sdry smass sused sinstead sof swet smass, sas sa smeasure sof sbiomass s? s- s scorrect
sanswer. s s sThe swater scontent sof sliving stissue svaries s
s

Why sis sbiomass smeasured sover sa sparticular speriod sof stime s? s- s scorrect sanswer. s s
sBiomass schanges sover stime se.g. strees swhen sleaves sare sshed s
s

What sis sgross sprimary sproduction s(GPP) s? s- s scorrect sanswer. s s sThe schemical
senergy sstored sin splant sbiomass, sin sa sgiven sarea sor svolume, sper sunit stime s
s

, What sis snet sprimary sproduction s(NPP) s? s(3 sthings) s- s scorrect sanswer. s s s1. sThe
schemical senergy sstored sin splant sbiomass sonce srespiratory slosses sto sthe

senvironment shave sbeen staken sinto saccount s s

2. The senergy savailable sto sthe splant sfor sgrowth sand sreproduction s
3. The senergy savailable sto sorganisms sat sthe snext strophic slevel s
s

What sis sthe sformula sfor sNPP s? s- s scorrect sanswer. s s sNPP s= sGPP s- sR s
s

What sis sthe sdifferene sbetween snet sprimary sproduction sand snet sproduction s? s- s
scorrect sanswer. s s sNet sprimary sproduction sis splants s

Net sproduction sis sconsumers s
s

Give sways swhy snot sall schemical senergy sis stransferred sto sthe snext strophic slevel? s- s
scorrect sanswer. s s s1. sNot sall sthe sfood sis seaten s(i.e. sroots sand sbones) s

2. Some sis sindigestible sand segested sas sfaeces s
3. Some sis slost sby sexcretion sor surine s
4. Some sis srespired s
s

What sis snet sproduction s? s- s scorrect sanswer. s s sThe senergy sin sthe sconsumer's
sbiomass savailable sto sthe snext strophic slevel s
s

What sis sthe sformula sfor snet sproduction s? s- s scorrect sanswer. s s sN s= sI s-(F s+ sR) s
s

What sdo sthe sletters sin sN= sI s- s(F s+R) sstand sfor s? s- s scorrect sanswer. s s sN= snet
sproduction s(chemical senergy): s s

I= sIngested s s
F= slost sas sfaeces sand surine s
R= slost sas srespiration s
s

What sis sprimary/secondary sproductivity s? s- s scorrect sanswer. s s sThe srate sof
sprimary/secondary sproduction s
s

How sis sprimary/secondary sproductivity smeasured s? s- s scorrect sanswer. s s sBiomass sin
sa sgiven sarea sin sa sgiven stime s s

e.g. skJ/ha/year s
s

How sis sthe sefficiency sof senergy stransfer scalculated s? s- s scorrect sanswer. s s s(Net
sproduction sof stropic slevel/ s s

net sproduction sof sprevious stropic slevel s) sx s100% s
s

Why sdoes sthe sefficiency sof senergy stransfer sincrease sup sa sfood schain? s- s scorrect
sanswer. s s sConsumers scontain sless sindigestible smatter sthan splants s
s

What sis sa strophic slevel s? s- s scorrect sanswer. s s sA sstage sin sa sfood schain s
s

How sdo sfarmers stry sto sincrease sefficiency sof senergy stransfer? s- s scorrect sanswer. s s s1.
s

Simplifying sfood swebs s s
2. sReducing senergy slost sthrough srespiration sof slivestock s
s

How sdo sfarmers ssimplify sfood swebs? s- s scorrect sanswer. s s sGet srid sof spests s s