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answer 1) Phytohormones or plant hormones, are naturally occurring small organic molecules or substances which influence physiological processes in plants at very low concentrations (Davies, 2004). In other words, phytohormones are chemical messengers that coordinate cellular activities of plants.
2) One can define tropic movement or tropism as the directional movement of particular parts of a plant in response to environmental stimuli. Notably, the movements are slow and are either towards the stimulus or away from it. Generally, a stimulus can either be positive or negative.
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