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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)3 marks

Phototropism helps plants adapt to their environment by directing growth towards or away from light.

Diagram Description

Phototropism in a Plant Stem

A diagram shows a plant stem bending towards a light source. The shaded side cells are longer than the side facing the light.

  1. a

    Identify which side of the stem has longer cells during phototropism and explain why.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Tropic responses

Paper 3Theory (Core)2 marks

Description

Phototropism

Plants often grow towards light to maximize photosynthesis. This growth response is called phototropism.

  1. a

    Describe what phototropism is in plants.

    Aim for approximately 2 distinct marking points.

    [2]