Survival and Responses in Plants
- Created by: Rebecca
- Created on: 22-03-13 17:10
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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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