Being the outermost layer of the plant body, epidermis mainly has protective functions and protects against desiccation and infections.
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The cutinized epidermis prevents the entry of pathogens, water loss from the aerial surfaces due to transpiration and also protects the plant from grazing.
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Epiblema giving rise to root hairs increases the surface area of root for absorption of water and minerals from the soil.
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Stomata in the epidermis help in gaseous exchange, primarily for photosynthesis.
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Glandular trichomes secrete essential oil for the plant and give characteristic odor and aroma to them.
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Cutinized aerial hairs or epidermal hairs perform insulating functions, protecting the plant against sudden changes in temperature and resultant high rate of transpiration.
