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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.
Light is a stimulus that plants respond to. This is called phototropism (photo= light). Plants usually display a positive phototropic response to light, which means they grow toward a light source. Plant hormones called auxins play a part in phototropism.Auxin is a plant growth hormone. When light is shined on one side of a plant the auxins move to the dark side of the plant.The hormones stimulate the cells on the dark side of the plant to elongate, while the cells on the light side of the plant remain the same.ight is a stimulus that plants respond to. This is called phototropism (photo= light). Plants usually display a positive phototropic response to light, which means they grow toward a light source. Plant hormones called auxins play a part in phototropism.