Question

Root hair are outgrowth of ________.

Answer 1

Root :

The root is the underground part of the plant and it contains large number of root hairs.
Root hairs :

Root hairs are unicellular and are the outgrowths of epidermis (outermost layer).
Root hairs are in direct contact with water and minerals and help in absorption of them.

Final answer : Root hair are outgrowth of epidermis.