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Plant and Animal Responses

Tropisms and plant responses to stress and herbivory

  • 1 thing to know
  • Components 01 and 03

Overview

Positive and negative phototropism and geotropism, the alkaloids, pheromones and touch responses that deter herbivores, and how tropisms are investigated.

What you need to know

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Key term

What are alkaloids and what is their function in plants?

Questions from this subtopic

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  1. 1

    What is a tropism?

    Model answer

    A directional growth response of a plant to an external stimulus, where the direction of growth is determined by the direction of the stimulus.

  2. 2

    Define phototropism.

    Model answer

    The directional growth response of a plant towards or away from a light source.

  3. 3

    What is geotropism (gravitropism)?

    Model answer

    The directional growth response of a plant towards or away from gravity.

  4. 4

    Distinguish between positive and negative tropism.

    Model answer

    Positive tropism is growth towards a stimulus; negative tropism is growth away from a stimulus.

  5. 5

    How do plants respond to abiotic stress?

    Model answer

    Through physiological and morphological changes that help them survive unfavourable environmental conditions.

  6. 6

    What is herbivory, and why have plants evolved responses to it?

    Model answer

    Herbivory is the consumption of plant material by animals. Plants have evolved responses to deter or limit damage from herbivores.

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