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Phototropism. Phototropism is a plant's growth response to light. Plants need light to grow. Usually, plant shoots and stems exhibit a positive reaction to light (they grow towards the light source). The ability to grow towards sunlight gives the plants an evolutionary advantage.tudies have shown that plant hormones of the class of auxins play a key role in this directed growth process. Auxin is released into the cells on the plants shady side. There, the hormone stimulates the cell walls to elongate. Also, growth is inhibited on the plant's sunny side.
In positive phototropism, the stem bends toward the light source. In plagiotropism, or diatropism, the leaf blades move at an angle toward the falling light. In negative phototropism the plant organs bend in a direction opposite to the light source (for example, ivy stems and the apices of certain roots). The same organ may be positively phototropic to weak light, negatively phototropic to intense light, and not at all phototropic to light of medium intensity.