Transport In Plants

Osmosis is the passage of water from a region of high water concentration to a region of low water concentration through a semi-permeable membrane.

The shrinkage of the protoplast of a living cell from its cell wall due to exosmosis under the influence of a hypertonic solution is called plasmolysis. When a cell is plasmolysed, it becomes flaccid. In a flaccid cell, its turgor pressure (TP) becomes zero and DPD becomes equal to OP as DPD = OP - TP.

Water present due to surface tension in minute capillaries or pore spaces formed by soil particles is called capillary water. It is the only form of soil water which is absorbed by the roots of plants, i.e., available water.