. Elementary botany . 56 PHYSICLOG Y. gains some heat during respiration. We have also seen in the attempt to grow seedlings in the absence of oxygen that very little growth takes place. But when oxygen is admitted growth takes place rapidly. The process of respiration, then, also sets free energy which is manifested in one direction, by growth. 133. Respiration in a leafy plant.—We may take a potted plant which has a well-developed leaf surface and place it under a tightly fitting bell jar. Under the bell jar there also should be placed a small vessel containing lime water. A similar ap- para
. Elementary botany . 56 PHYSICLOG Y. gains some heat during respiration. We have also seen in the attempt to grow seedlings in the absence of oxygen that very little growth takes place. But when oxygen is admitted growth takes place rapidly. The process of respiration, then, also sets free energy which is manifested in one direction, by growth. 133. Respiration in a leafy plant.—We may take a potted plant which has a well-developed leaf surface and place it under a tightly fitting bell jar. Under the bell jar there also should be placed a small vessel containing lime water. A similar ap- paratus should be set up, but with no plant, to serve as a check. The experiment must be set up in a room which is not frequented by persons, or the carbon dioxide in the room from respiration will vitiate the experiment. The bell jar containing the plant should be covered with a black cloth to pre- vent carbon assimilation. In the course of ten or i-i 49- r twelve hours, if everything has worked properly, the lest for liberation of car- . . bon dioxide from leafy plant lime water under the jar with the plant will show the water in smaller vessel. nmi °f carbonate of lime, while the other one will (Sachs.) show none. Respiration, therefore, takes place in a leafy plant as well as in germinating seeds. 134. Respiration in fungi.—If several large actively growing mushrooms are accessible, place them in a tall glass jar as described for determining respiration in germinating peas. In the course of twelve hours test with the lighted taper and the lime water. Respiration takes place in fungi as well as in green plants. 135. Respiration in plants in general.—Respiration is general in all plants, though not universal. There are some exceptions in the lower plants, notably in certain of the bacteria, which can only grow and thrive in the ab- sence of oxygen. 136. Respiration a breaking-down process.—We have seen that in res- piration the plant absorbs oxygen and gives off carbon d
Size: 2181px × 2291px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
