Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 153
d specimens in which this upward swimming is just suffi- 140 LIGHT AND THE BEHAVIOR OF ORGANISMS 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 longitudinal axes. Ifnow the light 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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