Light - stems = phototropic
Gravity - roots = positively geotropic / shoots = negatively geotropic
Water - roots = positively hydrotropic
Plant growth factors
> Exert influence by affecting growth
> Made by cells located throughout the plant (not organs)
> Can affect the tissues that release them (not just target tissues)
> Released in small quantities
> Effective close to the tissue that releases them
> Eg: IAA (Indoleacetic acid) causes plant cells to elongate
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