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Cambridge IGCSE Biology practice

Paper 6 structured question: Tropic responses

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Tropic responses

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Paper 6Alternative to PracticalPractical3 marks

Investigating Gravitropism in Roots

Results Table

Results of a Gravitropism Experiment

Seedlings were placed horizontally and the direction of root growth was recorded after 4 days.

SeedlingDirection of Root Growth
1Downwards
2Downwards
3Downwards
4Downwards
5Downwards
  1. a

    State State the type of tropism shown by the roots in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain Explain why the roots grow downwards when placed horizontally.

    Aim for approximately 2 distinct marking points.

    [2]

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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]