. Elementary botany . Squash seedling. Fig. 77. Position of cotyledons in light. Fig. Squash seedling. Position of cotyledons in the dark. ledons of the pumpkin is more or less horizontal, as shown in fig. 77. At night, or if we darken the plant by covering with a tight box, the leaves assume the position shown in fig. 78. While the horizontal position is the general one which is assumed by plants under the influence of light, their position is dependent to a certain extent on the intensity of the light as well as on the incidence of the light rays. Some plants are so strongly heliotropic that
. Elementary botany . Squash seedling. Fig. 77. Position of cotyledons in light. Fig. Squash seedling. Position of cotyledons in the dark. ledons of the pumpkin is more or less horizontal, as shown in fig. 77. At night, or if we darken the plant by covering with a tight box, the leaves assume the position shown in fig. 78. While the horizontal position is the general one which is assumed by plants under the influence of light, their position is dependent to a certain extent on the intensity of the light as well as on the incidence of the light rays. Some plants are so strongly heliotropic that they change their posi- tions all during the day. 203. Leaves with a fixed diurnal position.—Leaves of some plants when they are developed have a fixed diurnal position and are not subject to
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
