IB ESS HL 2.2.11 Food Chains and Trophic Levels Questions

Interpret trophic levels and energy movement through food chains.

Exam points

derive a valid multi-level food chain from a food web by selecting named organisms and orienting arrows in the direction of feeding-energy transfer
classify organisms by trophic position as producers or primary, secondary and tertiary consumers, including numerical levels when required
trace energy from an ecosystem source into producer chemical stores, through consumer feeding, and to decomposers in waste or dead material

[Maximum number: 1]

Figure A simplified food web in a kelp forest ecosystem

Figure Kelp forest ecosystems with and without the presence of sea otters

The arrows indicate the flow of carbon between the atmosphere and the carbon stored in kelp.

State the trophic level of sea urchins in the kelp forest ecosystem shown in Figure.

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