Transpiration is loss of water by the plant by evaporation, chiefly from the minute pores or stomata on the leaves.
This arrangement is a method of checking transpiration by creating a still atmosphere above the pore of the stoma, so that water vapour collects in it and diminishes the further outflow of vapour.
The importance of transpiration, is, however, so great, that these risks must be run.
Good ventilation is indispensable to allow the worm to give out by transpiration the great quantity of water that it absorbs with the leaf.
The lower surface of the potato leaf is furnished with numerous organs of transpiration or stomata, which are narrow orifices opening into the leaf and from which moisture is transpired in the form of vapour.
This is found especially in plants which during certain hours of the day are unable to cover the water lost through transpiration by the supply coming from the roots.
Over-transpiration in bright wintry weather, when the roots are not absorbing, often results in yellowing.
The evaporation which is associated with transpiration is no doubt another, but by themselves they are insufficient to explain the process of lifting water to the tops of tall trees.
These adaptations tend to lessen the amount of transpiration by protecting the stomata from the movements of the air.
The amount of water that escapes from plants through transpiration is clearly miniscule compared to the volume of water evaporating from oceans.
The leaves of the plant regulate the amount of water they hold through transpiration.
Although transpiration is a necessary accompaniment of nutrition, it may easily become excessive, especially where the plant cannot readily recoup itself.
After water is warmed by the sun, it turns into vapor and passes through pores in the plants by the process of transpiration.
The science class studied transpiration by doing an experiment with plants in a controlled environment.
It thrives in a warm atmosphere, even in a very hot one, provided that it is moist and that the transpiration is not in excess of the supply of water.
A very common function of hairs is to diminish transpiration, by creating a still atmosphere between them, as in the case of the sunk stomata already mentioned.