B2b - energy flow Flashcards

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1
Q

Whatdopyramidsofbiomassshow

A

thetotaldrymassoflivingmaterialateachstageofafoodchain

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2
Q

Explainwhypyramidsofnumbersandpyramidsofbiomassforthesamefoodchainscanbedifferentshapes

A

oneverylargeproducer/consumermayfeedmanysmallerconsumers(e.g. trees, parasites)

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3
Q

Explainthedifficultiesinconstructingpyramidsof biomass(2)

A

organismsmaybelongtomorethanonetrophiclevel

calculatingdrymassinvolveskillinganddryingorganisms

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4
Q

Explainhowsomeenergyistransferredtolessusefulformsateachstage(trophiclevel)inthefoodchain(3)

A

energyusedforrespirationforheatandmovement

egestion of undigested food which transfer energy out of the food chain

someenergylostviaexcretioninexcretoryproductslikesweat,urine

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5
Q

Whatcantheexcretoryproductsbeusedas

A

heenergyintheexcretoryproductscanbethestartingpointsfornewfoodchains

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6
Q

Explain the shape of the pyramids of biomass(2)

A

material and energy is lost at each trophic level and does not become biomass in the next trophic level
-less biomass higher up the pyramid

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7
Q

Explain the limited length of food chains

A

so much energy is lost at each trophic level that there’s not enough left to support animals after 4 or 5 trophic levels

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8
Q

What is the formula tocalculatetheefficiencyofenergy transfer

A

100%*((energyused for growth)/(energyavailable))

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