Mast, Samuel Ottmar, 1871- · New York, J. Wiley · leaf 155
ind specimens in which this upward swimming is just suffi- 140 LIGHT AXD THE BEHAVIOR OF ORGAMSMS cient to overcome the effect of gravity, and under such con-ditions they appear to be hanging in the water motionless.They are, however, rotating on their longitucHnal axes. Ifnow the Hght intensity,… … Fig. 20. Diagram representing the reaction of a Volvox colony when the lightintensity is suddenly changed, a, outline of colony; b, longitudinal axis; c, lightrays; d, point in the course where the light is suddenly decreased; e, point whereit is suddenly increased; /, course taken by colony. In…
Light -- Physiological effect · Phototropism
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