1. NASTIC RESPONSES

2. Not as well known/understood as tropisms. Not as well known/understood as tropisms.

3. NASTIC RESPONSES Not as well known/understood as tropisms. Not as well known/understood as tropisms. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors.

4. NASTIC RESPONSES Not as well known/understood as tropisms. Not as well known/understood as tropisms. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Removes a plant/part of a plant from unfavourable conditions  favourable. Removes a plant/part of a plant from unfavourable conditions  favourable.

5. NASTIC RESPONSES Not as well known/understood as tropisms. Not as well known/understood as tropisms. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Removes a plant/part of a plant from unfavourable conditions  favourable. Removes a plant/part of a plant from unfavourable conditions  favourable. Non-directional, so don’t have positive/negative aspect. Non-directional, so don’t have positive/negative aspect.

6. NASTIC RESPONSES Not as well known/understood as tropisms. Not as well known/understood as tropisms. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Removes a plant/part of a plant from unfavourable conditions  favourable. Removes a plant/part of a plant from unfavourable conditions  favourable. Non-directional, so don’t have positive/negative aspect. Non-directional, so don’t have positive/negative aspect. Occur to changes in the intensity of the stimulus = the rate of response increases as the intensity of the stimulus increases. Occur to changes in the intensity of the stimulus = the rate of response increases as the intensity of the stimulus increases.

7. NASTIC RESPONSES Not as well known/understood as tropisms. Not as well known/understood as tropisms. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Are rapid, reversible movement responses by parts of a plant to changes in abiotic factors. Removes a plant/part of a plant from unfavourable conditions  favourable. Removes a plant/part of a plant from unfavourable conditions  favourable. Non-directional, so don’t have positive/negative aspect. Non-directional, so don’t have positive/negative aspect. Occur to changes in the intensity of the stimulus = the rate of response increases as the intensity of the stimulus increases. Occur to changes in the intensity of the stimulus = the rate of response increases as the intensity of the stimulus increases. Usually results in changes in osmotic potential in certain cells. Usually results in changes in osmotic potential in certain cells.

8. EXAMPLE Oxalis leaves collapse due to change in osmotic pressure in the cells of the leaf stalk. Oxalis leaves collapse due to change in osmotic pressure in the cells of the leaf stalk.

9. EXAMPLE When a cell is full of water, it puts pressure on the cell membrane causing the cell to become thick = turgor pressure. When a cell is full of water, it puts pressure on the cell membrane causing the cell to become thick = turgor pressure.

10. EXAMPLE Oxalis leaves collapse due to change in osmotic pressure in the cells of the leaf stalk. Oxalis leaves collapse due to change in osmotic pressure in the cells of the leaf stalk. When a cell is full of water, it puts pressure on the cell membrane causing the cell to become thick = turgor pressure. When a cell is full of water, it puts pressure on the cell membrane causing the cell to become thick = turgor pressure. This supplies support for the plant. This supplies support for the plant. When the cell loses water, it becomes soft, and droops. When the cell loses water, it becomes soft, and droops. ** Could be to do with K+ ions drawn out into surrounding tissue and therefore drawing the water out of the cell  more water in the cell than outside now ** ** Could be to do with K+ ions drawn out into surrounding tissue and therefore drawing the water out of the cell  more water in the cell than outside now **

11. PHOTONASTY The collapse of leaves when exposed to high light intensity. The collapse of leaves when exposed to high light intensity.

12. PHOTONASTY Response may prevent damage to a leaf’s photosynthetic apparatus from over exposure. Response may prevent damage to a leaf’s photosynthetic apparatus from over exposure.

13. PHOTONASTY The collapse of leaves when exposed to high light intensity. The collapse of leaves when exposed to high light intensity. Response may prevent damage to a leaf’s photosynthetic apparatus from over exposure. Response may prevent damage to a leaf’s photosynthetic apparatus from over exposure.

14. NYCTINASTY Refers to the closing of petals of flowers (sleep movements) of certain species. Refers to the closing of petals of flowers (sleep movements) of certain species.

15. NYCTINASTY Typically show a circadian rhythm and are controlled by an internal clock. Typically show a circadian rhythm and are controlled by an internal clock.

16. NYCTINASTY Refers to the closing of petals of flowers (sleep movements) of certain species. Refers to the closing of petals of flowers (sleep movements) of certain species. Typically show a circadian rhythm and are controlled by an internal clock. Typically show a circadian rhythm and are controlled by an internal clock. Leaf drooping of sleep movements not fully understood but it could promote dew forming on leaves and dropping to the ground. Leaf drooping of sleep movements not fully understood but it could promote dew forming on leaves and dropping to the ground. https://www.youtube.com/watch?v=FKaR20S99Bw https://www.youtube.com/watch?v=FKaR20S99Bw https://www.youtube.com/watch?v=FKaR20S99Bw

17. THIGMONASTY Is a response to touch. Is a response to touch. Eg. Mimosa & venus fly traps Eg. Mimosa & venus fly traps https://www.youtube.com/watch?v=BLTcVNyOhUc https://www.youtube.com/watch?v=BLTcVNyOhUc https://www.youtube.com/watch?v=BLTcVNyOhUc May have evolved to disturb or scare herbivorous insects. May have evolved to disturb or scare herbivorous insects.

18. THERMONASTY Flowers of some plants (Crocus and tulips) close in low temps. Flowers of some plants (Crocus and tulips) close in low temps.