logo

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

3

Paper

2

Marks

Topic

Food chains and food webs

Exam-style question

Try this first

Paper 3Theory (Core)2 marks

Pyramids of numbers and biomass illustrate the structure of food chains.

Diagram Description

Pyramid of Numbers

A pyramid showing 1 tree at the producer level, 200 insects at the primary consumer level, and 10 birds at the secondary consumer level.

Trophic LevelNumber of Organisms
Producers1
Primary Consumers200
Secondary Consumers10
  1. a

    Describe the shape of this pyramid of numbers and explain why it has this shape.

    Aim for approximately 2 distinct marking points.

    [2]

0 of 1 part answered

Answer every part before opening the mark scheme.

Common mistake

No common mistake is linked to this question yet.

Related flashcards

Flashcard 1 of 6

Press Space to flip, arrows to move

Related practice questions

Question 1 of 5

Choose an answer, get feedback, then move sideways through the set.

0 of 4 attempted

Paper 3 structured question: Food chains and food webs

Paper 3Theory (Core)2 marks

Data Table

Pyramid of Biomass Data

Mass of organisms at each trophic level in grams per square meter (g/m²).

Trophic LevelBiomass (g/m²)
Producers5000
Primary Consumers500
Secondary Consumers50
  1. a

    Describe the shape of this pyramid of biomass and explain why it has this shape.

    Aim for approximately 2 distinct marking points.

    [2]