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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)1 marks

Effects of human activities on ecosystems

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Overfishing in a lake ecosystem

Overfishing has reduced the population of large predatory fish in a lake. This has affected the populations of smaller fish and aquatic plants in the ecosystem.

  1. a

    State one effect of overfishing on the lake ecosystem.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Food chains and food webs

Paper 3Theory (Core)1 marks

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Introduction of a non-native species

A non-native fish species was introduced into a river. This species competes with native fish for food and habitat.

  1. a

    Identify one possible effect of introducing the non-native fish species on the native fish population.

    Aim for approximately 1 distinct marking point.

    [1]