Energy Flows


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B2 3
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Answers to summary questions
1 a) The mass of living material in an animal or a plant.
b) A scale drawing representing the biomass of all the organisms at each
stage of a food chain.
c) The block representing the rose bush should be the largest, the one for the
birds the smallest.
d) Because, in pyramids like this one, there is only one producer but many
primary consumers. Looking at the pyramid of numbers gives a very
inaccurate picture. Biomass shows exactly how much of each type of
organism there is.
e) Counting is sometimes easier than weighing and biomass often uses dry
mass ­ this involves killing the organisms before weighing them.
2 a) Fossil fuels are carbon-based chemicals and burning them in
oxygen (from the atmosphere) will inevitably release carbon dioxide.
b) Rapid increase in world population leading to: increased vehicle ownership
and energy demands, economic growth leading to increased
industrialisation (e.g. China).
c) Deforestation reduces the number of trees that would otherwise remove
carbon dioxide from the air. Also, if deforestation is combined with burning
the trees then this will also add carbon dioxide to the atmosphere.
Teaching notes
The questions are designed to crystallise knowledge and are not designed to be
exam style. This format is particularly useful for students who have difficulty
answering questions without some kind of writing frame.
AQA Science © Nelson Thornes Ltd 2006 B2 3 1

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e) A or B = glucose or oxygen
C or D = carbon dioxide or water (1 mark each)
f) Burning of fossil fuels/coal/oil/gas (1 mark)
3 a) To measure the rate of decay (1 mark)
b) 20 (1 mark)
c) No, the more water they added the less the loss of length of the
shrimp heads. (1 mark)
AQA Science © Nelson Thornes Ltd 2006 B2 1.…read more

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1. (a) 1 mark for each 4
decay burning
(b) (i) digests or breaks down or decays 1
dead (organic) material
accept rots for digests
accept plants for dead organic material
do not accept `live on' or `decompose'
(ii) bacteria or worms or maggots 1
accept microbes but not germs or viruses
2. (a) (i) carbohydrate*/fat/protein in cell 1
(or example e.g. glucose/starch)
for 1 mark
(ii) 21500 × 100 or 2.…read more

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(d) any two from 2
· control ripening
· herbicides
· prevent over ripening in transport
· stimulate root growth
other growth references are not neutral
· use in tissue culture to produce large numbers of plantlets
5.…read more


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