Describe the water relations of a plant.

(N/A) $\Rightarrow$ Water is essential for all physiological activities of the plant.
$\Rightarrow$ Water plays a very important role in all living organisms.
$\Rightarrow$ It provides the medium in which most substances are dissolved.
$\Rightarrow$ The protoplasm of the cells is essentially water in which different molecules are dissolved and suspended.
$\Rightarrow$ $A$ watermelon has over $92\%$ water.
$\Rightarrow$ Most herbaceous plants have only about $10\%$ to $15\%$ of their fresh weight as dry matter.
$\Rightarrow$ Woody plants have relatively very little water,while soft parts of plants mostly contain water.
$\Rightarrow$ $A$ seed may appear dry,but it still contains water; otherwise,it would not be alive and respiring.
$\Rightarrow$ Terrestrial plants take up a huge amount of water daily,but most of it is lost to the air through evaporation from the leaves.
$\Rightarrow$ $A$ mature corn plant absorbs almost $3$ litres of water in a day,while a mustard plant absorbs water equal to its own weight in about $5$ hours.
$\Rightarrow$ Because of this high demand for water,it is not surprising that water is often the limiting factor for plant growth and productivity in both agricultural and natural environments.