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The coleoptile tip experiment, conducted by F. W. Went, demonstrated the presence and role of growth-regulating substances in plants. Coleoptiles are protective sheaths covering the emerging shoots of monocot seedlings such as oat. In the experiment, young oat seedlings were grown in darkness so that the coleoptiles elongated straight without light influence. The tips of the coleoptiles were carefully cut and placed on small ____ __________ ____ _______ ______ _________ ____ ___.
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