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Cambridge IGCSE Biology practice

Which phase of the sigmoid growth curve is characterized by rapid population increase?

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MCQ

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cambridge_mcq

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Topic

Populations

Exam-style question

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Which phase of the sigmoid growth curve is characterized by rapid population increase?.

  1. A.Lag phase
  2. B.Exponential phase
  3. C.Stationary phase
  4. D.Death phase

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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]