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Cambridge IGCSE Biology practice

Paper 4 structured question: Homeostasis

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Homeostasis

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Paper 4Theory (Extended)4 marks

Homeostasis involves maintaining stable internal conditions in the body.

Description

Negative Feedback in Homeostasis

Negative feedback is a control mechanism that helps maintain conditions at a set point by reversing any changes detected.

  1. a

    State what is meant by the term 'set point' in homeostasis?

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain how negative feedback helps maintain homeostasis.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Homeostasis

Paper 4Theory (Extended)4 marks

Diagram Description

Negative Feedback Loop

A sensor detects a change in a condition and sends a signal to a control center. The control center activates effectors that produce a response to reverse the change and restore the condition to the set point.

  1. a

    Identify the role of the sensor in a negative feedback loop.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain why negative feedback is important for maintaining homeostasis.

    Aim for approximately 3 distinct marking points.

    [3]