Assertion: epidermis's pore | /r/LocatedNear | a pair of guard cells
Facets:
Source sentences:
text: A typical leaf has an outer (epidermal) layer, pores (stomata) surrounded by a pair of guard cells, middle tissue (mesophyll) where photosynthesis occurs and a vascular system that carries water and nutrients.
text: The epidermis on the underside of the leaf contains stomata (pores) surrounded by a pair of guard cells that help regulate transpiration.