Transport in Plant

1. Transport in Plant Water transport Food transport

2. Water Transport Root Pressure Capillary action Transpiration

3. Root pressure Water is drawn in root by osmosis. Excess water is pushed into xylem by pressure. This pressure push water up in xylem.

4. Capillary Action Since the adhesive force between water molecules and tube materials is larger than cohesive force between water molecules, water column is pulled up by adhesive force.

5. Transpiration Stomata opened by guard cells. Water diffuse out through stomata. Water evaporate from cell wall to intercellular space. Water draw to surface cell from xylem by osmosis. Unbreakable water column pull up by leave. Water draw into xylem from root cell by pull. Water draw from soil to root cells.

7. Glucose increase Stomata

8. Symplast, apoplast Diffusion evaporation Water diffuse out

9. Xylem

10. Tracheid

11. Photo

12. In root

13. In Root

14. Water pathway

15. Casparian strip

16. Mature endodermis

17. Photo of young root

18. Model of transpiration

19. Potometer Not for rate of transpiration but for water absorption only. How can transpiration rate be determinated.

20. Plant in dry region Increase water absorption Decrease water evaporation

21. Transport of food in Phloem Criteria Energy required Occurred in sieve tubes Direction from leave to organs Up and down possible

22. Structure of phloem

23. Mass flow hypothesis Sucrose move to phloem from leave cell by active transport. Water potential in phloem decrease. Water move in phloem by osmosis. Water volume increase in phloem, turgid pressure increase. Sucrose remove from phloem at organ by active transport. Water potential in phloem increase. Water move out of phloem by osmosis. Pressure decrease. Water flow by pressure difference. Sucrose flow with water along phloem.

26. Model of translocation

27. Experiment