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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

Exam-style question

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Paper 3Theory (Core)1 marks

An ecologist studies a pond ecosystem and draws a food web showing the feeding relationships between organisms.

Diagram Description

Pond Food Web

The food web includes algae, insects, small fish, frogs, and birds. Arrows show feeding directions: algae → insects → small fish → frogs → birds. Some insects also eat algae and small fish.

  1. a

    Describe what a food web is.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Food chains and food webs

Paper 3Theory (Core)2 marks

Diagram Description

Pond Food Web

The food web includes algae, insects, small fish, frogs, and birds. Arrows show feeding directions: algae → insects → small fish → frogs → birds. Some insects also eat algae and small fish.

  1. a

    Describe how the food web shows the feeding relationships between organisms.

    Aim for approximately 2 distinct marking points.

    [2]