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Cambridge IGCSE Biology practice

Paper 4 structured question: Selection

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Selection

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Paper 4Theory (Extended)3 marks

Adaptation and natural selection

Description

Adaptation Process

A population of beetles lives in a forest. Some beetles have green shells, and some have brown shells. Birds can see the green beetles more easily and eat them, but the brown beetles are better camouflaged and survive more often. Over many generations, the number of brown beetles increases in the population.

  1. a

    Describe how natural selection leads to adaptation in this beetle population.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Selection

Paper 4Theory (Extended)4 marks

Description

Adaptation in a Changing Environment

A species of fish lives in a lake where the water temperature gradually increases over many years. Some fish have genes that help them tolerate warmer water better than others. Over many generations, the population shows an increase in these genes.

  1. a

    Identify what process causes the increase in genes for warm water tolerance.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how this process leads to adaptation in the fish population.

    Aim for approximately 3 distinct marking points.

    [3]