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Exam-style practice

Food chains and food webs answer explanations

Review worked answers and explanations for Food chains and food webs. Aligned to Cambridge IGCSE Biology.

Answer explanations

Question 21 of 36

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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.

    [2]
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