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Question 3

From Biology SL Paper 2 (November 2024, TZ2)

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  1. An example of energy flow (kJ m⁻² year⁻¹) in the North Sea is shown.
Diagram showing energy flow in kJ m^-2 year^-1 between trophic levels A, B, C, D, and X, starting from light energy.
Diagram showing energy flow in kJ m^-2 year^-1 between trophic levels A, B, C, D, and X, starting from light energy.

(a) Identify the trophic level represented by C. [1]

(b) Sketch a pyramid of energy for the trophic levels represented by A, B, C and D. [2]

(c) State two sources of energy for X. [1]

(d) Explain the reasons that little energy is transferred between trophic levels, apart from that transferred to X. [2]

Textbook topics in this question

Review the exact course sections assessed by each question part.

Mixed-topic question
3(a)12.2 Transfer of Energy and Matter
3(b)12.2 Transfer of Energy and Matter
3(c)12.2 Transfer of Energy and Matter12.1 Modes of Nutrition
3(d)12.2 Transfer of Energy and Matter