Wheat leaf trichome. Coloured scanning electron micrograph (SEM) of the surface of a leaf from a wheat plant (Triticum sp.), showing a single trichome. Trichomes are specialised structures that can be glandular in nature, defend against predators, or help reduce water loss. This view includes stomata (oval openings), the gas exchange pores found in the epidermis of plant leaves and stems. Wheat grains are used to make flour for products such as breads and pasta.