JAMB - Biology (1983 - No. 31)
In a positive phototropic response of a coleoptile, the region of greatest curvature is brought about by the
movement of auxins away from the region of curvature
even distribution of auxins in all parts of the coleoptile
inhibition of growth by auxins in the region f smaller curvature
concentration of auxins in the region of curvature
absence of auxins in the coleoptile