Butternut or white walnut (Juglans cinerea), a North American species showing compound leaves and slender drooping male catkins. (Photo by Rob Routledge, Sault College, Sault Ste. Marie, Ontario, Canada)
Relation between photorespiration, photosynthesis, and carbon dioxide concentration. The top curve is the response of photosynthesis of a leaf to carbon dioxide when photorespiration is eliminated by reducing the oxygen concentration to 2%. The…
GS-GOGAT ammonia cycle, which recovers the ammonia lost as a result of glycine metabolism during photorespiration. Tetrahydrofolate (THF) is a compound that can transfer single carbon atoms, in this case from one glycine to another.
Side-view reconstruction of Biscalitheca musata, a zygopterid sporangium with dorsiventral symmetry, two lateral multiseriate annuli and small nests of thickened cells in the sporangial wall. (After S. H. Mamay, Amer. J. Bot., 44(3):236, 1957)
Close-up view of pods and branches (lacking leaves, which fall off during the dry season) of the kapok tree (Ceiba pentandra). Note that one of the seed-containing pods has opened, exposing the fluffy kapok fiber (silk cotton). (Photo by Don Graham)