. Elements of ecology. Ecology. 208 Light taxis; orientation in the opposition direction is a negative tropism or taxis. Occasionally a transverse tropism or taxis is displayed. Control of speed of locomotion by the intensity of the factor is termed a kinesis. Gravity never changes significantly in intensity, but the speed of swimming, flying, or creeping is influenced by altera- tions in the strength of other factors; the common occurrence of photokinesis has already been mentioned. The position of the main axis of the body is the primary orientation of the plant or animal. This is usually de
. Elements of ecology. Ecology. 208 Light taxis; orientation in the opposition direction is a negative tropism or taxis. Occasionally a transverse tropism or taxis is displayed. Control of speed of locomotion by the intensity of the factor is termed a kinesis. Gravity never changes significantly in intensity, but the speed of swimming, flying, or creeping is influenced by altera- tions in the strength of other factors; the common occurrence of photokinesis has already been mentioned. The position of the main axis of the body is the primary orientation of the plant or animal. This is usually determined by gravity, as is seen in the upward growth (negative geotropism) of the shoot and the downward growth (positive geotropism) of the root of a plant seedling (Fig. ). In the aquatic environment the buoyant action. 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 Clarke, George L. (George Leonard), 1905-. New York, Wiley
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