Phototropism and Auxins
- Created by: chlo_beard
- Created on: 21-03-16 17:50
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- Phototropism and Auxins
- Phototropism
- Some parts of the plants can respond to light by growing in a certain direction.
- Shoots are positively phototropic. Towards the light
- Roots are negatively phototropic. Away from the light
- Positive phototropism
- Without sunlight plants can't photosynthesise and don't produce the food they need for energy and growth.
- Negative Phototropism
- Plants need nutrients and water from the soil to grow. Phototropism means roots grow away from light, down into the soil where the absorb the water and nutrients
- Auxins
- Auxins are chemicals that control growth near the tips of shoots and roots.
- They are produced in the tips and diffuses backwards to stimulate the cell elongation process
- Auxins are involved in the responses of plants to light, gravity and water
- Phototropism
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