Cambridge IGCSE Biology practice

Paper 4 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 4Theory (Extended)2 marks

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

Description

Consider the advantages of using different types of pyramids to represent food chains.

a
Identify one advantage of using a pyramid of energy compared to a pyramid of numbers.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify one advantage of using a pyramid of energy compared to a pyramid of biomass.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 4Theory (Extended)4 marks

Description

Explain why pyramids of energy provide a better representation of food chains than pyramids of numbers or biomass.

a
State two reasons why pyramids of numbers can be misleading.
Your answer
Aim for approximately 2 distinct marking points.
[2]
b
State two reasons why pyramids of energy are more accurate.
Your answer
Aim for approximately 2 distinct marking points.
[2]