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Learning objective

Illustrate, explain, and analyze pyramids of numbers and biomass.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE BiologyOrganisms and their environmentCore content

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Quick explanation

Illustrate, explain, and analyze pyramids of numbers and biomass

  • This point belongs to Food chains and food webs, especially Food chains and food webs outcomes.
  • You need to be able to illustrate, explain, and analyze pyramids of numbers and biomass.
  • The key ideas to know are Describe, Draw, and Interpret.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeDrawInterpret

Why it matters

This objective helps connect Food chains and food webs outcomes to exam-style questions, flashcards, and revision notes for Food chains and food webs.

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Paper 3 structured question: Food chains and food webs

Paper 3Theory (Core)2 marks

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]
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Cambridge IGCSEBiology resources