Pine needle surface. Coloured environmental scanning electron micrograph (ESEM) of the surface of a pine needle (Pinus sp.) showing stomata (red). Sto

---

Pine needle surface. Coloured environmental scanning electron micrograph (ESEM) of the surface of a pine needle (Pinus sp.) showing stomata (red). Stomata are pores that are the site of gaseous exchange in the plant. The opening and closing of the stomata is controlled by semicircular guard cells. When the guard cells are turgid the stomata are open and when they are flaccid the stomata are closed.

---

Size: 5125px × 3861px
Photo credit: © THIERRY BERROD, MONA LISA PRODUCTION/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: biological, biology, botanical, botany, cell, coloured, electron, environmental, esem, exchange, false-coloured, flora, gaseous, guard, leaf, micrograph, nature, needle, pine, pinus, plant, scanning, sem, stoma, stomata, surface