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Practice sheet  system & models 2
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Practice sheet system & models 2

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  • 1. Guru charan kumar IB ESS 2013 SYSTEMS & MODEL WORKSHEET 2 Figure 1 shows energy flow through a food chain. Figure 1 primary producers – 900 kcal m 2 yr–1 (a) (i) cattle 256 kcal m–2 yr–1 human 6.6 kcal m–2 yr–1 Calculate the percentage energy loss to humans from the initial input of 900 kcal m–2 yr–1. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (ii) Explain why farming systems based on crop production are more energy efficient than harvesting from the sea. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (iii) Suggest two ways in which energy may be lost from the system. ........................................................................................................................... ........................................................................................................................... (2) (b) (i) Suggest three reasons why livestock (cattle, goats, sheep, etc.) form a part of most farming systems. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ...........................................................................................................................
  • 2. Guru charan kumar IB ESS 2013 ........................................................................................................................... ........................................................................................................................... (3) (ii) Figure 2 shows a systems diagram for a farm. Annotate the diagram to show two inputs and two outputs, and their possible environmental impacts. Figure 2 INPUTS Input Impact Input Impact OUTPUTS Output Impact Output Impact (4) (Total 13 marks)

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