Cambridge IGCSE Biology practice

Paper 3 structured question: Food chains and food webs

Try the question first, then check the answer and practise the same topic again.

At a glance

Paper

Marks

Topic

Food chains and food webs

Exam-style question

Try this first

Paper 3Theory (Core)4 marks

Ecologists use pyramids to represent food chains and energy flow.

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]

0 of 3 parts answered

Answer every part before opening the mark scheme.

Common mistake

No common mistake is linked to this question yet.

Flashcard 1 of 6

Press Space to flip, arrows to move

Paper 3Theory (Core)2 marks

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]