Plant Growing Toward Sunlight (IMAGE) Technical University of Munich (TUM) Caption The plant hormone auxin is responsible for a plant's ability to grow towards the light. Credit Photo: C. Schwechheimer/TUM Usage Restrictions Free for use for coverage on Technische Universitaet Muenchen with appropiate credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.