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10 Cards in this Set
- Front
- Back
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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 roots grow, 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 hormone in plants? |
auxin |
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what is phoototropism? |
plant growth response 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 in response to gravity |
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describe how auxin controls geotropism? |
stops cell elongation in the root |
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what do negativeand positve tropisms mean? |
positive tropism - towards th stimulus. negative tropism - away from the stimulus |
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how can plant growth hormones be used in agriculture? |
seletive weed killers - auxin makes broad leaves gow out of control and die. rooting powder - auxin makes cuttings develop roots quikely. seedless fruit - flowers sprayed with hormones to make fruit dvelop but not seeds. fruit ripening - farmers use hormones to control fruit ripening. |
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