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9 Cards in this Set
- Front
- Back
describe the direction that shoots grow in, relating to the things that they are sensitive to |
shoots are sensitive to light, they grow towards light. |
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describe the direction that the roots grow in, relating to the things that they are sensitive to |
roots are sensitive to gravity they grow towards the force of gravity |
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what is the name of the hormones in plants |
auxin |
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what is photoropism |
plant growth reponse to light |
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describe how auxin controls phototropism |
causes cell elongation in the shoot |
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what is geotropism |
plant growth response to gravity |
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describe how auxin controls geotropism |
stops cell elongation in the root |
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what do negative and positive tropisms means |
positive tropism = towards stimulus
negative tropism = away from the stimulus |
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how can plant growth hormones be used in agriculture |
selective weed killers- auxin makes broad leaved plants grow out of control and die. rooting powder- auxin makes cutting develop roots quickly. seedless fruit- flowers sprayed with hormones to make fruit develop but not seeds. fruit ripening- farmers use hormones to control fruit ripening |