5.3 Energy and Ecosystems Flashcards

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1
Q

explain how farming practises increase the produtivity of agricultural crops (6)

A

fertilisers added to soil
fertilisers contain phosphate for ATP

ploughing soil allows nitrification

selective breeding of crops for more favourable charachteristics

greenhouses enchaces temp/co2/light

pesticides/weed killers remove competition

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2
Q

suggests how you can determine the dry mass of a sample of a plant (2)

A

heat to 100 to evaporate water
weigh and heat until no further change in mass

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3
Q

what is the advantage of using dry mass and not fresh mass to compare the yield of plants (2)

A

ammount of water present may vary
will affect fresh mass not dry mass as no water in dry mass

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4
Q

Gross primary production (GPP)

A

total chemical energy store in a given volume of plant at a given time

KJ m yr

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5
Q

net primary production

A

NPP = GPP - R

R = respiration

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6
Q

Net production

A

N= I (F+R)
I - chemical energy
F - energy loss in faecaes
R - resp loss

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