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9 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 sensetive to light , they grow towards the light |
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describe the direction that roots grow in, relating to the thngs that they are sensitive to |
Roots are sensitive to gravity, they grow towards gravity |
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what is the name of the hormone in plants? |
Auxin |
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what is phototropism? |
Plant growth responses 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 responses to gravity |
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Describe how auxin controls geotropism |
Stops cell elongation in the shoot |
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What do positive and negative tropisms mean? |
Positive tropism; towards the 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 cuttings 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 |
