Tropic movements in plants are directional responses to environmental triggers such as light or gravity. Shoots exhibit positive phototropism by bending towards light, while roots show negative phototropism by bending away from light.
What are tropic movements in plants, and how are they influenced by environmental triggers like light and gravity?
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Tropic movements in plants are growth responses that occur in the direction of an external stimulus. Phototropism is a tropic movement influenced by light, where plants grow towards or away from light sources, optimizing photosynthesis. Gravitropism involves responses to gravity, determining the orientation of plant growth. Positive gravitropism is growth towards gravity (roots), while negative gravitropism is growth against gravity (stems). These movements are regulated by hormones, primarily auxins. Auxin redistribution, influenced by environmental triggers, causes differential cell elongation, leading to tropic movements. Plants employ tropic responses to adapt and optimize their growth in changing environmental conditions.