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B2 3
Summary sheet

Teacher notes

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…

Page 2

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B2 3

Continued ...

Energy flows
1 a) Tadpoles, gnat larvae and water fleas (1 mark)
Any one omitted/any wrong/more than three organisms = no marks
b) Algae and flowering water plants (1 mark)
Either omitted/either wrong/more than 2 listed = no marks
c) Crayfish (1 mark)

(Accurately drawn…

Page 3

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B2 3

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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…

Page 4

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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…

Page 5

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B2 3

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3. (a) (i) (tiny green) plants / phytoplankton 1
for 1 mark
(ii) · penguin 1
· shrimp
· cod
· squid
any two for 1 mark
(b) Decrease: seals will eat more squid and penguins 1
for 1 mark
Stay the same: 2
· more…

Page 6

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B2 3

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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. (a) 115 1
(b) any four from…


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