reaction, response - a bodily process occurring due to the effect of some foregoing stimulus or agent; "a bad reaction to the medicine"; "his responses have slowed with age"

ergotropism - an affinity for work

geotropism - an orienting response to gravity

heliotropism - an orienting response to the sun

meteortropism - an effect of climate on biological processes (as the effect on joint pains etc.)

neurotropism - an affinity for neural tissues

phototropism - an orienting response to light

trophotropism - an orienting response to food