. Elementary botany. Botany. 84 PHYSIOLOGY. Horizontal leaves and shoots can be shown to be subject to the same influence, and are therefore diageotropic. 198. Influence of light.—Not only is light a very important factor for plants during carbon conversion, it exerts great influ- ence on plant growth and movement. 199. Retarding influence of light on growth.—We have only to return to the experiments performed in growing plants in the dark to see one of the influ- ences which light exerts on plants. The plants grown in the dark were longer and more slender than those grown in the light. Light
. Elementary botany. Botany. 84 PHYSIOLOGY. Horizontal leaves and shoots can be shown to be subject to the same influence, and are therefore diageotropic. 198. Influence of light.—Not only is light a very important factor for plants during carbon conversion, it exerts great influ- ence on plant growth and movement. 199. Retarding influence of light on growth.—We have only to return to the experiments performed in growing plants in the dark to see one of the influ- ences which light exerts on plants. The plants grown in the dark were longer and more slender than those grown in the light. Light then has a retarding influ- ence on the elong- ation of the stem. 200. Influence ^'s- ?'• J, _ , , J, Radish seedlings grown in the 01 light on QireC- dark, long, slender, not green. tion of growth.—While we are growing seedlings, the pots or boxes of some of them should be placed so that the plants will ^ have a one-sided illumination. This can Radish seedlings grown in tlie light, shorter, stouter, and be done by placing: them near an open green '« color. Growth re- . tarded by light. window, in a room with a one-sided illu- mination, or they may be placed in a box closed on all sides but one which is facing the window or light. In 12-24 hours, or even in a much shorter time in some cases, the stems of the seedlings will be directed toward the source of light. This influence exerted by the rays of light is helioiropism, a turning influenced by the sun or sunlight. 201. Diaheliotropism.—Horizontal leaves and shoots are diaheliolropic as well as diageotropic. The general direction. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt
Size: 1502px × 1663px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
