Microscopy image of tulip leaf showing guard cells (black arrow) around stomatal openings (red arrow).
Doc. RNDr. Josef Reischig, CSc., Wikimedia Commons
100X magnification of tulip leaf showing guard cells and stomata.
MarekMiś, Wikimedia Commons
Up-close electron microscopy image of stomata on tomato leaf.
Photohound, Wikimedia Commons
Chloroplasts seen as green granules inside Elodea canadensis cells (cells may be observed with blue-grey boundary).
Juan Carlos Fonseca Mata, Wikimedia Commons
400X magnification of cytoplasmic movement inside Elodea sp (8X speed).
MarceloTeles, Wikimedia Commons