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Tropism
Growth response from a plant from an environmental stimulation from one direction.
4 main plant hormones
Auxin, Gibberellin, Ethene, ABA
Auxins
Control cell elongation
Stop abscission
Maintain apical dominance
Stimulate Ethene release
Involved in fruit ripening
Involved in tropisms
Gibberellin
Cause stem elongation
Moving of seed food stores
Stimulate pollen tube growth in fertilisation
Ethene
Causes fruit ripening
Promotes abscission
ABA
Maintains seed and bud dormancy
Stimulates cold protective responses
Stimulates stomatal closing