. Botany of the living plant. Botany; Plants. Fig. 80. Arrangement for showing that oxygen is given off in Photosynthesis. A, before exposure to light, the tube is filled with water. B, after exposure for some time. A large volume of discharged gas has collected in the tube. (After Noll.) property which was noticed many years ago. The oxygen that is pro- duced in photosynthesis diffuses from the chloroplasts through the cytoplasm and cell-walls and thence in the gaseous form through the air-spaces of the leaf, and finally emerges into the atmosphere, apart from that utilised in respiration (se
. Botany of the living plant. Botany; Plants. Fig. 80. Arrangement for showing that oxygen is given off in Photosynthesis. A, before exposure to light, the tube is filled with water. B, after exposure for some time. A large volume of discharged gas has collected in the tube. (After Noll.) property which was noticed many years ago. The oxygen that is pro- duced in photosynthesis diffuses from the chloroplasts through the cytoplasm and cell-walls and thence in the gaseous form through the air-spaces of the leaf, and finally emerges into the atmosphere, apart from that utilised in respiration (see p. 133). The production of the gas is most easily demonstrated in water-plants. If a cut shoot of Canadian Pond Weed (Elodea) lying in water is exposed to bright sunlight, a continuous stream of bubbles may be seen to escape from the cut end of the shoot, especially if the water has previously been enriched with extra carbon dioxide. The temperature also must be favourable. The gas can be collected by the arrangement shown in Fig. 8o, and tests will show that the gas contains a high proportion of. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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