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Learning objective

Conduct an investigation and describe the processes of gravitropism and phototropism in both shoots and roots.

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  • Practise with linked questions.
Cambridge IGCSE BiologyCoordination and responseCore contentPractical objective

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Quick explanation

Conduct an investigation and describe the processes of gravitropism and phototropism in both shoots and roots

  • This point belongs to Tropic responses, especially Tropic responses outcomes.
  • You need to be able to conduct an investigation and describe the processes of gravitropism and phototropism in both shoots and roots.
  • The key ideas to know are Describe and Investigate.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeInvestigate

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This objective helps connect Tropic responses outcomes to exam-style questions, flashcards, and revision notes for Tropic responses.

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Paper 6 structured question: Tropic responses

Paper 6Alternative to PracticalPractical3 marks

Method

Method to Investigate Phototropism

1. Place several young bean seedlings in a box with a small hole on one side to allow light in. 2. Keep the box in a warm place and water the seedlings regularly. 3. After 5 days, observe and measure the angle of bending of the shoots towards the light. 4. Repeat the experiment with the hole on different sides to change light direction.

SeedlingAngle of Bending (degrees)
130
228
332
429
531
  1. a

    Describe Describe how the shoots respond to the light in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify Identify the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  3. c

    Suggest Suggest one control variable that should be kept constant in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
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Cambridge IGCSEBiology resources