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tissues grow upwards and which grow downwards, leaf formation and stem growth, fruit development and ripening, as well as leaf abscission and even plant death. the most important plant hormones are abscissic acid (aba), auxins , ethylene , gibberellins , and cytokinins , though there are many other substances
. environmental physiologists also examine plant response to biological factors. this includes not only negative interactions, such as competition , herbivory , disease and parasitism , but also positive interactions, such as mutualism and pollination . tropisms and nastic movements[ edit ] main articles...
https://en.wikipedia.org/wiki/Plant_physiology