. Biology and man. Biology; Human beings. PHOTOSYNTHESIS AND RESPIRATION When photosynthesis takes place, light energy is absorbed and stored. When sugar is oxidized, the stored energy is liberated as heat. The waste products of respiration are the raw materials of photosynthesis In the end, all food comes from green plants. It is as if the carbon and the oxygen in CO2 were pulled asunder by the action of sunlight through chlorophyl. They are then able to combine again and so liberate energy. It is thus that carbohydrates yield energy in becoming oxidized, whether in the body of a living thing
. Biology and man. Biology; Human beings. PHOTOSYNTHESIS AND RESPIRATION When photosynthesis takes place, light energy is absorbed and stored. When sugar is oxidized, the stored energy is liberated as heat. The waste products of respiration are the raw materials of photosynthesis In the end, all food comes from green plants. It is as if the carbon and the oxygen in CO2 were pulled asunder by the action of sunlight through chlorophyl. They are then able to combine again and so liberate energy. It is thus that carbohydrates yield energy in becoming oxidized, whether in the body of a living thing or in a flame. All the energy which plants and animals get from the oxidation of carbohydrates, fats, or proteins is thus derived from the sun's energy. There is more than poetry in the statement that every human act is a transformed sunbeam. How Do Minerals Reach the Leaves? The Work of the Root^ Roots are familiar to us as plant anchors. They are also special organs through which plants absorb water and dis- solved minerals, and through which they get rid of wastes. The actual exchange of material between the plant and the soil takes place through the thin walls of the delicate root hair (see illustration, p. 144). As the plant grows larger, its absorbing area increases by the branching of the roots. But it is always in the regions near the growing tips of rootlets that root hairs are formed—and that absorption takes place. iSee No. 7, p. 158. 142. 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company
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