Cambridge IGCSE Biology practice

Paper 4 structured question: Food chains and food webs

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Attempt question Food chains and food webs revision Revise the key idea

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Topic

Food chains and food webs

Exam-style question

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Paper 4Theory (Extended)4 marks

Energy transfer between trophic levels is often inefficient.

Data Table

Energy Transfer Data

The table shows the amount of energy (in kJ) available at each trophic level in a food chain.

Trophic Level	Energy Available (kJ)
Producers	10000
Primary Consumers	1000
Secondary Consumers	100
Tertiary Consumers	10

a
Identify the trend shown in the energy available at each trophic level.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Explain why the energy available decreases at each trophic level.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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