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9 Cards in this Set
- Front
- Back
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describe the direcion that shots 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 rots 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 hormone in plants |
auxin |
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what is phototropism |
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 response to gravity |
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describe how auxin controls geotropism |
stops cells elongation in the root |
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whatdo negative ad positive tropisms mean |
Positive- towards the stimulus Negative- away from the stimulus. |
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how can plant growth hormones be used in agriculture |
Selective weed killer-auxin makes broad leaves plants grow out of control and die. Rooting powder- auxin makes cuttings develop roots quickly. Seedless fruit- flowers are sprayed with hormones to make fruit develop but not seeds. Fruit ripening- farmers use hormones to control fruit ripening. |
