# B1.5 Energy and biomass in food chains

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B1.5 Energy and biomass in food chains
B1.5 Energy and biomass in food chains GCSE items that can be used to define successful outcomes for peer and self assessment activities

Using Exam pro items to support successful outcomes
Assessment of practical work Using Exam pro items to support successful outcomes Students will be able to test their progress against learning outcomes using questions taken from past AQA GCSE examinations. Version Copyright © AQA and its licensors. All rights reserved.

B1.5 Energy and biomass in food chains June 2012 BL1FP

B1.5 Energy and biomass in food chains June 2012 BL1FP

B1.5 Energy and biomass in food chains June 2012 Mark Scheme

Students investigated a food chain in a garden.
B1.5 Energy and biomass in food chains June 2012 BL1HP Students investigated a food chain in a garden. The students found 650 aphids feeding on one bean plant. Five ladybirds were feeding on the aphids. Jan2012BL1HP Version Copyright © AQA and its licensors. All rights reserved.

(a) (i) Draw a pyramid of biomass for this food chain.
B1.5 Energy and biomass in food chains June 2012 BL1HP (a) (i) Draw a pyramid of biomass for this food chain. Label the pyramid. (2 marks) (a) (ii) The biomass in the five ladybirds is less than the biomass in the bean plant. Give two reasons why. (2 marks) (b) The carbon in dead bean plants is returned to the atmosphere via the carbon cycle. Describe this part of the carbon cycle. (4 marks) Version Copyright © AQA and its licensors. All rights reserved.

B1.5 Energy and biomass in food chains June 2012 Mark Scheme

The diagram shows the annual flow of energy through a habitat.
B1.5 Energy and biomass in food chains June BL1HP The diagram shows the annual flow of energy through a habitat. The figures are in kJ m-2 8 (a) (i) Calculate the percentage of the energy in sunlight that was transferred into energy in the green plants. Show clearly how you work out your answer % (2 marks) Version Copyright © AQA and its licensors. All rights reserved.

B1.5 Energy and biomass in food chains June 2012 BL1HP
(a) (ii) Suggest reasons why the percentage energy transfer you calculated in part (a)(i) was so low. (2 marks) (b) Compare the amount of energy transferred to the insect-eating birds with the amount transferred to the predatory birds. Suggest explanations for the difference in the amount of energy transferred to the two types of bird. (3 marks) Version Copyright © AQA and its licensors. All rights reserved.

Mark scheme B1.5 Energy and biomass in food chains Bio BL1HP June 2012