Epidermal cells are often modified to perform specialised functions in plants. Name some of them and the functions they perform.

(N/A) $ \Rightarrow $ Modification of epidermal cells: The following modifications are observed in epidermal tissues:
$(1)$ Root hairs:
$ \Rightarrow $ Structure: In the root hair region, epidermal cells of the root are extended as unicellular root hairs.
$ \Rightarrow $ Function: They increase the surface area for the absorption of water and mineral elements from the soil.
$(2)$ Trichomes:
$ \Rightarrow $ Structure: These are epidermal outgrowths on the stem. They can be unicellular or multicellular, branched or unbranched, and sometimes secretory.
$ \Rightarrow $ Function: They help in preventing water loss due to transpiration and protect the plant against herbivores.