Stomata and Hydathodes:
The following are the points of difference between Stomata and Hydathodes-
Stomata | Hydathodes |
---|---|
Found in the epidermis of leaves, young stems, perianth and fruits. | Present on the tips and margins of the leaves at the vein ends. |
These are surrounded by pairs of chlorophyllous guard cells. | They are surrounded by a ring of cuticularized achlorophyllous cells. |
Guard cells are either kidney-shaped or dumbbell-shaped. | Hydathode guard cells are oval barrel-shaped in outline. |
Guard cells show turgor movements. | Turgor movements are absent. |
They are subtended by a substomatal cavity. | They are subtended by a mass of loosely arranged cells. |
The stomata are surrounded by subsidiary epidermal cells. | Subsidiary cells are absent. |
Stomata lead internally into an air cavity. | An air cavity is absent. |
They do not have any correspondence to vein endings. | They occur over vein endings. |
Their opening and closing are regulated by guard cells. | They always remain open. |
An epithem is absent. | An epithem is present. |
They pass out water vapours. | They pass out liquid water. |
They are concerned with transpiration. | They are concerned with guttation. |
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