Thursday 27 August 2015

Plant-Water Relations

Water is one of the most important constituent of the protoplasm and body fluids. It forms 50 - 90% of the total body weight of living beings and is the universal solvent.
                                                                            Gases, minerals and other solutes enter the plants and move from cell to cell dissolved in water. It provides turgidity to growing cells which is essential for plants to maintain their form and structure. It helps in regulating the body temperature.

Osmoregulation in plants:- Osmoregulation is the homeostatic process in which organisms maintain their internal conditions constant or in which organisms maintain the concentration of their body fluids and temperature at a steady state. In plants this is maintained by absorption, transport and retention of water in their bodies. Transpiration ( loss of water in the form of water vapour from the exposed surface of the plant ) results in the loss of water by plants but this loss is made up by absorption of water.
                The forces like imbibition, diffusion and osmosis are responsible for exchange of material between cells and environment and between cells.

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