Plant hormones that control the growth at the tips of shoots and roots. They move through the plant in solution
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Where are auxins produced?
In the tips. They diffuse backwards to stimulate cell elongation process, that occurs just behind the tips.
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What does auxin do in the root?
It inhibits growth.
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How are shoots positively phototrophic?
They grow towards light. When a shoot tip is exposed to light, more auxin accumulates on the shady side so cells elongate faster on the shady side, curving it to the light
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How are shoots negatively geotrophic?
They grow away from gravity's pull. When a shoot is sideways, more auxin accumulates on the lower side so it elongates on that side and curves upwards.
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How are roots positively geotrophic?
They grow towards gravity. A root growing sideways has more auxin on the lower side, but as auxin inhibits growth it grows downwards.
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How are roots negatively phototrophic?
If a root is exposed to light, more auxin accumulates on the shady side so the root grows downwards.
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What are the commercial uses of plant hormones?
Selective weedkillers, growing from cuttings with rooting powder, controlling the ripening of fruit, controlling dormancy
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How can plant hormones be used as selective weedkillers?
Most weeds are broad leaved. Selective weedkillers only affect the growth of broad leaved plants. They mess up broad leaved, but leave grass and crops unharmed.
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How can plant hormones be used to grow from cutting with rooting powder?
Rooting powder contains plant growth hormones meaning cuttings grow as new plants.
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How can plant hormones be used to control the ripening of fruit?
They can delay it so the fruit is picked when unripe and firmer. ripening hormone ensures it is just right when it reaches the shelves.
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How can plant hormones be used to control dormancy?
Lots of seeds wont germinate until theyve been through certain conditions. A hormone breaks this dormancy. This helps plants grow when they wouldnt usually
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Other cards in this set
Card 2
Front
Where are auxins produced?
Back
In the tips. They diffuse backwards to stimulate cell elongation process, that occurs just behind the tips.
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