Functions of Phloem are :- Phloem helps in the transportation of organic food to all the parts of a plant. Phloem parenchyma helps in lateral conduction and the storage of food. Phloem fibres are used by man for making ropes and rough cloths.
Sieve tubes Companion cells Phloem Parenchyma Phloem Fibers
Tracheids Vessels or Tracheae Xylem or Wood Parenchyma Xylem Sclernchyma or Wood Fibres
Sunlight Temperature Humidity Air movements
Swelling of a plasmolysed cell to retain its original volume when placed in pure water. This happens due to endosmosis .
Shrinkage of protoplasm of a cell from its wall due to the loss of water by exosmosis when plays in the concentrated solution.
Withdrawal of water/solvent molecules from a cell into an external concentrated solution.
In flow of water/solvent molecules from an external dilute solution into a cell.
On absorption of water, a plant cell becomes swollen or turgid. The protoplasm of this turgid cell presses the call wall outside with a force called Turgor pressure.
