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A partial solar eclipse on December 14, 2001, viewed from Minnesota (Saros 132, Member 45) An annular solar eclipse on December 26, 2019, viewed from Nilambur, India (Saros 132, Member 46)
Several hypotheses have been proposed for the occurrence of heliotropism in flowers: The pollinator attraction hypothesis holds that the warmth associated with full insolation of the flower is a direct reward for pollinators.
cross section of a curled leaf of Ammophila (plant) (40x magnified); white buliform cells are visible at the base of the grooves. During drought, the loss of water through vacuoles induces the reduced bulliform cells to allow the leaves of many grass species to close and the two edges of the grass blade fold toward each other.