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Cambridge IGCSE Biology practice

What is gravitropism in plants?

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Tropic responses

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What is gravitropism in plants?.

  1. A.Growth towards or away from gravity
  2. B.Growth towards light
  3. C.Growth in response to touch
  4. D.Growth due to water availability

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Paper 3 structured question: Tropic responses

Paper 3Theory (Core)2 marks

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]