B1 2.3
- Created by: Angelbecs
- Created on: 27-06-15 14:06
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- Control in Plants
- Key Words
- Phototropism
- Plant growth response to light.
- Geotropism
- Plant growth response to gravity.
- Positive tropism
- Towards the stimulus.
- Negative Tropism
- Away from the stimulus.
- Auxin
- Plant growth hormone
- Tropism
- Plant growth response to a stimulus.
- Phototropism
- Phototropism
- Auxin is produced in the tip of the shoot.
- Auxin moves to the shaded side of the stem.
- Auxin causes cell elongation.
- Geotropism
- Auxin produced in the tip of the root.
- Auxins have the opposite effect in the root.
- Auxins stop elongation and root grows down.
- Uses of plant hormones
- Selective weed killers
- Auxin makes broad leaved plants grow out of control and die.
- Rooting powders
- 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.
- Selective weed killers
- Key Words
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