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Page 1

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Energy Flows
3 The diagram shows what happens to some of the energy in the food that a chicken eats.




3 (a) Calculate the percentage of energy used for growth.
Show clearly how you work out your answer.
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Energy used for growth =...................................... %
(2 marks)
3 (b)…

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8
1 (a) Tuna fish are carnivores. In the wild they feed on smaller fish called herring. Herring
feed on plankton. Tuna can be attacked by parasitic worms which feed on their flesh.
(i) In the space below sketch the appearance of a pyramid of biomass for this food chain.…

Page 3

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(1 mark)

(c) Some consumers will not buy tuna grown in this way.
Suggest one reason for their decision.
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............................................................................................................................................
(1 mark)

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2 The diagram shows part of the carbon cycle.




(a) Which letter, A, B, C or D, represents:
(i) Respiration?...................................
(1 mark)
(ii) Photosynthesis? ...........................…

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5


3 The photograph shows what happens to some of the energy in the food that a cow eats.




3 (a) Calculate the percentage of the energy in the cow's food that is transferred into new growth.
Show clearly how you work out your answer.
............................................................................................................................................
............................................................................................................................................
Answer = ................................................................%…

Page 5

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1 The diagram shows a pyramid of biomass drawn to scale.




1 (a) What is the source of energy for the water plants?
............................................................................................................................................
(1 mark)
1 (b) The ratio of the biomass of water plants to the biomass of insects is 5:1.
Calculate the ratio of the biomass of…

Page 6

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1 A fish farmer keeps trout in a large net in a lake.




The fish farmer feeds the trout on food made from soya beans.
When the trout are large enough the farmer sells them for food for people.
1 (a) Draw a pyramid of biomass for the three organisms…

Page 7

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1 (d) Some trout die before they are large enough to be sold.
The dead trout contain carbon.
Use your knowledge of the carbon cycle to describe how this carbon is returned to the atmosphere
after the trout die.
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(2 marks)

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Comments

Swallowtail

This document contains a number of sample examination questions which are always a useful exercise for a revising student to undertake. The mark scheme for these questions is supplied as "Energy flow answers" under this topic heading.

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