Multiple Choice Question 1 What features are associated with the leaf epidermis? A= guard cells B= trichomes C= stomata D= all of the above are correct Question 2 The main function of root hairs is protection against herbivores? True or False Solution 1.A all of the above are correct. The epidermis of the leaf contains stomata which are the openings through which exchange of gases takes place and the guard cells control the opening and closing of the stomata. Trichomes are hair like appendages which prevent transpiration, and discourage herbivores to feed on the plant. 2.False. The main function of the root hairs is to collect water and minerals from the surroundings.