GCSE Biology (AQA)

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Plant Tropisms

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Homeostasis and Response Plant Hormones

Plant Tropisms

1:38 Control and Coordination in Plants
Spec 4.5.4.1
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  • Tropism is a plant's growth response to a stimulus such as light, water, or gravity.
  • The specific stimulus a plant responds to varies depending on the conditions and the plant part involved.
  • Plant leaves may grow towards light, causing the stem to bend, while roots may grow towards water.
  • Plant responses also include growth in relation to gravity, with upper parts growing upwards and roots growing downwards.
  • These growth responses help plants access necessary resources and enhance survival chances.
  • Tropisms are classified as either positive or negative.
  • Positive tropism is growth towards a stimulus, exemplified by roots growing towards gravitational pull.
  • Negative tropism is growth away from a stimulus, as seen in shoots growing opposite to gravitational pull.
  • Understanding of tropisms for exams requires recognizing that they can be either towards or away from a stimulus, not necessarily defining the terms positive or negative tropisms.

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