Difference Between Stomata And Hydathodes

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BASIS OF COMPARISON STOMATA HYDATHODES
Description

 

Location Stomata are found on the surfaces of both the epidermis of leaf and on the young parts of the stem, fruits, flowers etc. Hydathodes occur on the margins and tips of the leaves.
Presence Stomata are found in the aerial parts of all land plants. Hydathodes are present on the leaves of only a few plants.
Role Stomata facilitate exchange of gases like oxygen and carbon dioxide. Hydathodes do not play any role in gaseous exchange in plants.
Chloroplast The guard cells surrounding the stomata contain chloroplasts. The cells surrounding the hydathodes do not contain chloroplasts.
Opening And Closing

 

Stomata remain opened during day time and closed during night time. Hydathodes remain open during both night and day time.
Regulation of Opening & closing Mechanism The mechanism of opening and closing of stomata can be controlled guard cells. The closing and opening mechanism is absent in hydathodes and therefore they always remain closed.
Relation With Vein Ends Of The Leaves The stomata do not have any functional relation with the vein ends of the leaves. Hydathodes have a functional relationship with the vein ends of the leaves.
Subsidiary Cells Stomata are usually enmeshed between many subsidiary cells. The hydathodes are not surrounded with subsidiary cells.
Subtended Cavity Stomata are subtended by a sub-stomatal cavity. Hydathodes are subtended by a sub-epidermal cavity and a mass of loosely packed parencymatous cells referred to as Epithem.
Surrounding Cells Stomata are surrounded by a pair of specialized epidermal cells referred to as Guard cells. Hydathodes are surrounded by a ring of non-specialized cells.
What They Pass Out Stomata pass out water vapour. Hydathode passes out liquid water.
Processes Involved In Stomata are involved in Transpiration and exchange of gases. Hydathodes are involved in guttation.

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