12 marks
Define the term community in the context of environmental systems and ecology.
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Communities & Ecosystems (SL IB Environmental Systems & Societies (ESS))
Topic Questions
2a2 marks
State the word equation for aerobic respiration.
2b1 mark
State the main energy transformation occurring during respiration.
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3a3 marks
Construct a systems diagram to represent photosynthesis.
3b1 mark
State the main energy transformation occurring during photosynthesis.
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42 marks
Define bioaccumulation.
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17 marks
Evaluate the use of food webs as models for studying ecosystems.
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29 marks
Discuss the impacts of persistent or non-biodegradable pollutants, such as DDT or mercury, on ecosystems.
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1a2 marks
The figures below show a pyramid of numbers and a pyramid of biomass for a tropical rainforest ecosystem.
i)
Explain how the pyramid of numbers shown above can have fewer producers than consumers.
[1]
ii)
State one other type of ecological pyramid that can be used to demonstrate trophic levels within ecosystems.
[1]
1b2 marks
Evaluate pyramids of numbers as a method of representing trophic levels within ecosystems.
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2a2 marks
Use the figure below to produce a food chain that includes exactly four trophic levels.
2b2 marks
Outline how two named human activities can alter the pyramid structure of the trophic levels within a tropical rainforest ecosystem.
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3a4 marks
Outline the role of primary producers in ecosystems.
3b4 marks
Explain the vulnerability of top carnivores to non-biodegradable toxins.
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42 marks
Define the term ecosystem.
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