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Cambridge IGCSE Biology practice

Paper 3 structured question: Tropic responses

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Tropic responses

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Paper 3Theory (Core)2 marks

A student observes a plant seedling growing in a tilted pot. The roots grow downwards into the soil, and the shoots grow upwards towards the light source.

Description

Observation of Seedling Growth

The seedling is placed in a pot tilted at an angle. Despite the tilt, roots grow downwards into the soil, and shoots grow upwards towards the light.

  1. a

    Describe how gravitropism causes the roots to grow downwards in the tilted pot.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Tropic responses

Paper 3Theory (Core)3 marks

Description

Plant Response to Horizontal Placement

When a plant is placed horizontally, the shoot bends upwards and the root bends downwards over time.

  1. a

    Identify the type of plant response shown by the shoot and root.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how gravitropism causes the shoot to bend upwards.

    Aim for approximately 2 distinct marking points.

    [2]