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HEITI PAVES / SCIENCE PHOTO LIBRARY HEITI PAVES / SCIENCE PHOTO LIBRARY
Growth of thale cress. Time-lapse footage showing growth and nastic movements of 4-week-old seedlings of thale cress (Arabidopsis thaliana), over the course of a week. The seedlings grow towards the light (phototropism). They also exhibit nastic movements, which are non-directional movement responses to stimuli such as temperature, humidity, and light irradiance.
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