9.1 sensory reception

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  • Stimulus and response
    • Sensory reception
      • Tropisms
        • A tropism is a growth movement of a part of a plant in response to a directional stimulus.
        • Grows towards= positive  grows away= negative
        • Example: plant shoot grows towards light (positive phototropism)
    • A stimulus is a detectable change in the internal or external environments of an organism that causes an immune response
    • Receptors transform the energy of a stimulus into some form of energy that can be processed by the organism and lead to a response.
    • The response is carried out by one or more of a range of different cells, tissues, organs and systems. These are known as effectors.
    • One way is hormones which are relatively slow
    • A more rapid way found in animals is the nervous system


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