. Nature-study; a manual for teachers and students. Nature study. Important functions of the leaf in common with other plant parts: Synthesis of proteids. Respiration. Digestion. Absorbed by the leaf: Sun's energy. Oxygen for respiration. Carbon dioxide for photosynthesis. Given off from the leaf: Oxygen from photosynthesis. Carbon dioxide from respiration. Water by transpiration. Absorbed by the roots: Oxygen. Water. Salts of: Potassium. Calcium. Magnesium Iron. Nitrogen. Sulphur. Phosphorus. Given off from the roots: Carbon dioxide. Possibly in some in- stances organic acids and enzymes. Fig
. Nature-study; a manual for teachers and students. Nature study. Important functions of the leaf in common with other plant parts: Synthesis of proteids. Respiration. Digestion. Absorbed by the leaf: Sun's energy. Oxygen for respiration. Carbon dioxide for photosynthesis. Given off from the leaf: Oxygen from photosynthesis. Carbon dioxide from respiration. Water by transpiration. Absorbed by the roots: Oxygen. Water. Salts of: Potassium. Calcium. Magnesium Iron. Nitrogen. Sulphur. Phosphorus. Given off from the roots: Carbon dioxide. Possibly in some in- stances organic acids and enzymes. Fig, 120. Longitudinal Diagram of a Plant. In this diagram the dotted highway is the water conducting; area, and the black hig-hway is the area for conduction of the food made in the leaf. The arrows indicate the direction of flow in these highways. From Steven's "Introduction to Botany," copyright, 1902, by D. C. Heath & Company. Used by permission. 317. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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