Survival and Responses in Plants

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  • plants respond to changes in their internal and external environments

LIGHT - plant shoots grow towards the light (positively phototropic) as it is needed for photosynthesis

GRAVITY - roots are sensitive to gravity and grow in the direction of its pull (positively geotropic)

WATER - roots grow towards water (positively hydrotropic) to absorb it for photosynthesis and metabolic processes

  • a tropism is a growth movement of part of a plant in response to a directional stimulus
    • the response is brought about by plant growth factors

Plant growth factors:

  • chemicals that speed up or slow down plant growth
  • produced in small quantities
  • produced in the growing regions of plants
  • auxins stimulate the growth of shoots by cell elongation
  • IAA (indoleacetic acid…


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