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Cambridge IGCSE Biology practice

Paper 3 structured question: Food chains and food webs

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Attempt questionFood chains and food webs revisionRevise the key idea

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Food chains and food webs

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Paper 3Theory (Core)2 marks

Pyramids of biomass show the total mass of organisms at each trophic level.

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]

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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]