Cambridge IGCSE Biology practice

Paper 3 structured question: Food chains and food webs

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Paper

Marks

Topic

Food chains and food webs

Exam-style question

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Paper 3Theory (Core)2 marks

Food chains can be represented by pyramids of numbers or pyramids of biomass.

Description

Explain why a pyramid of biomass is more useful than a pyramid of numbers when showing a food chain.

a
State one benefit of using a pyramid of biomass instead of a pyramid of numbers.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify one reason why a pyramid of numbers can be misleading.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 3Theory (Core)4 marks

Description

Evaluate why pyramids of biomass are generally preferred over pyramids of numbers to depict food chains.

a
State one advantage of a pyramid of biomass.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify one limitation of a pyramid of numbers.
Your answer
Aim for approximately 1 distinct marking point.
[1]
c
State one reason why pyramids of biomass give a clearer picture of energy flow.
Your answer
Aim for approximately 2 distinct marking points.
[2]