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Learning objective

In the sigmoid growth curve, identify the lag phase, exponential phase, stationary phase, and death phase for a population in a resource-limited environment.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE BiologyOrganisms and their environmentCore content

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Quick explanation

In the sigmoid growth curve, identify the lag phase, exponential phase, stationary phase, and death phase for a population in a resource-limited environment

  • This point belongs to Populations, especially Populations outcomes.
  • You need to be able to in the sigmoid growth curve, identify the lag phase, exponential phase, stationary phase, and death phase for a population in a resource-limited environment.
  • The key ideas to know are Identify.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Identify

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Paper 3 structured question: Populations

Paper 3Theory (Core)2 marks

Diagram Description

Sigmoid Growth Curve

The graph shows population size on the y-axis and time on the x-axis. The curve has four phases: lag phase (initial flat section), exponential phase (steep upward slope), stationary phase (plateau), and death phase (downward slope).

  1. a

    Identify the lag phase on the sigmoid growth curve.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify the exponential phase on the sigmoid growth curve.

    Aim for approximately 1 distinct marking point.

    [1]
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