A kinesis is a non-directional random movement that increases in rate when conditions are unfavourable.If an organism suddenly moves into an unfavourable region it increases the speed at which it moves and the rate at which it changes direction.This increases its chances of moving back into the favourable environment.If the organism is unsuccessful and stays in an unfavourable environment for a period of time it changes direction less often, mostly moving in a straight line and turning sharply occasionally. This increases its chances of moving into a region with favourable conditions such as humidity and temperature.Woodlice live in damp conditions and need to reduce water loss by evaporation from their surface. When in dry conditions they move rapidly and change direction often until they return to a damp area.If they do not manage to get to a damp area after a while they change direction less often and move in a straight line, turning sharply occasionally until they reach a damp area.
Once they are within the damp area, they move much more slowly and turn less often. This increases their chances of staying within the favourable environment thereby increasing their chances of survival.
Once they are within the damp area, they move much more slowly and turn less often. This increases their chances of staying within the favourable environment thereby increasing their chances of survival.