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9 Cards in this Set
- Front
- Back
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Describe the direction 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 the roots grow in, relating to the things that they are sensitive to. |
Roots are sensitive tto gravity they grow towards the force of gravity |
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What is name of the hormone in plants? |
Auxin |
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What is phototropism? |
plants growth response to light |
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Describe how auxin control phototropism |
Causes cell elongation in the shoot |
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What is geotropism? |
Plants growth response to gravity |
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Describe how auxin controld geotropism |
Cell elongation in the root |
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What do negative and positive tropisms mean? |
Possitive tropism-towards the stimulus
Negative- 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 |
