Concept
Version 9
Created by Boundless
Stem Anatomy
Stomata
Openings called stomata (singular: stoma) allow a plant to take up carbon dioxide and release oxygen and water vapor. The (a) colorized scanning-electron micrograph shows a closed stoma of a dicot. Each stoma is flanked by two guard cells that regulate its (b) opening and closing. The (c) guard cells sit within the layer of epidermal cells.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Stems. October 17, 2013."
http://cnx.org/content/m44702/latest/Figure_30_02_05abc.jpg
OpenStax CNX
CC BY 3.0.