Botany

Cover Botany
Botany
Green, J. Reynolds (Joseph Reynolds), 1848-1914
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A delicate structure like a seed- ling, whose cells are filled with water, is exposed to a general evaporation at the surface. This, if not guarded against, would lead to a loss of water beyond the control of the plant, and would interfere with the proper con- duction of the water to the places where the construction of sugar takes place. We find a very simple but very effective protective mechanism. The outer walls of the cells of the epidermis become thickened and their external layers are ch...anged into a very impermeable 70 BOTANY material called cutin. These external layers can be stripped off from large pieces of the surface in a kind of pellicle, which is known as the cuticle. It is developed more freely over the leaves than over the stem.
This layer serves too as a protection against cold. For this purpose many plants have an additional safe- guard, in the shape of hairs, or outgrowths of the epidermal cells, forming a fine felt work over their sur- faces, clothing them indeed in a kind of cotton garment.


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