. Biology and man. Biology; Human beings. The process of carbohydrate formation by chlorophyl is called photo- synthesis, from two Greek words meaning "light" (compare ^y^o/ograph) and "a putting together". It is easy to show that in the absence of light, chlorophyl is inactive and photosynthesis is suspended. Moreover, if a plant is kept in darkness for a longer period, the chlorophyl begins to dis- appear, and in the end the leaves will turn yellow or even white. We use this fact in the blanching of celery. We also know that the outer, exposed, leaves of a head of lettuce
. Biology and man. Biology; Human beings. The process of carbohydrate formation by chlorophyl is called photo- synthesis, from two Greek words meaning "light" (compare ^y^o/ograph) and "a putting together". It is easy to show that in the absence of light, chlorophyl is inactive and photosynthesis is suspended. Moreover, if a plant is kept in darkness for a longer period, the chlorophyl begins to dis- appear, and in the end the leaves will turn yellow or even white. We use this fact in the blanching of celery. We also know that the outer, exposed, leaves of a head of lettuce or cabbage are much greener than the inner leaves. Experiments have shown that plants can carry on this work under artificial light. By the use of strong electric light during the night, lettuce plants have been hastened in their growth and development, and brought. PHOTOSYNTHESIS IN A LEAF Palisade cells receive water from the roots by way of fine tubules, and carbon diox- ide by osmosis from the surrounding air spaces. Under the action of sunlight, the chlorophyl combines carbon, oxygen and hydrogen from water and carbon dioxide into sugar or starch molecules, and an excess of oxygen passes out of the cells by osmosis 139. 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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