Questions about Energy Flows

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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) The energy that is not transferred into growth is lost.
Give three ways in which this energy is lost.
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3.........................................................................................................................................
(3 marks)
3 (c) The pictures show two ways of keeping chickens to produce eggs.
Battery chickens produce more eggs per year than free-range chickens.
Suggest one reason why.
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(1 mark)
3 (d) The animals that we raise for food are usually herbivores (plant eaters) rather than
carnivores (flesh eaters).
Explain why.
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(2 marks)
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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.
Do not forget to label each section of the pyramid.
(2 marks)
(ii) If a tuna eats 1 kg of herring, it gains about 65 g in mass.…read more

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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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8
2 The diagram shows part of the carbon cycle.
(a) Which letter, A, B, C or D, represents:
(i) Respiration?...................................
(1 mark)
(ii) Photosynthesis? ...........................
(1 mark)
(b) Local authorities are encouraging people to recycle vegetable waste by converting it into
compost.
Compost is made by mixing the vegetable waste with soil in a large container.…read more

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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.
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Answer = ................................................................%
(2 marks)
3 (b) The energy from the cow's food which is not transferred into new growth is lost.
Give three ways in which this energy is lost.
1..........................................................................................................................................
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2..........................................................................................................................................
............................................................................................................................................
3..........................................................................................................................................
............................................................................................................................................…read more

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The diagram shows a pyramid of biomass drawn to scale.
1 (a) What is the source of energy for the water plants?
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(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 insects to the biomass of frogs.
Show clearly how you work out your answer.
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ratio =....................…read more

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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 in this food chain.
Label the pyramid.
(2 marks)
1 (b) It would be more energy efficient if people ate the soya beans rather than eating the trout.…read more

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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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............................................................................................................................................…read more

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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