responses in plants and animals 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelAQA Created by: hollysunshineyCreated on: 03-05-17 16:43 what is a tropism? response of a plant to an external directional stimuli 1 of 15 how do plants respond to stimuli by regulating their growth 2 of 15 what is a positive tropism growth towards stimuli 3 of 15 what is a negative tropism growth away from stimuli 4 of 15 shoots are... positively phototropic and negatively geotropic 5 of 15 roots are positively geotropic and negatively phototropic 6 of 15 what do auxins (e.g IAA) do stimulate cell elongation - so growth of shoots & inhibits growth in roots 7 of 15 how is IAA moved around a plant diffusion/ active transport over short distances & in phloem for long 8 of 15 what happens to a shoot with IAA in phototropism IAA moves to shaded part- cells elongate and shoot grows to light 9 of 15 what happens to a root with IAA in phototropism IAA conc on shaded side-growth inhibited so root bends away from light 10 of 15 what happens to a shoot with IAA in geotropism IAA conc on lower side-cells elongate & shoot grows upwards 11 of 15 what happens to a root with IAA in geotropism IAA conc on lower side, growth inhibited & root grows downwards 12 of 15 what is taxes/ a tactic response organisms move towards/ away directional stimulus 13 of 15 what is kineses/ kinetic responses organisms movement is affected by non directional stimulus 14 of 15 what do simple responses ensure simple organisms are in a favorable environment 15 of 15
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