Flashcards in Responses to Stimuli: Taxes Deck (8):
what is a taxis?
a taxis is a simple response whose direction is determined by the direction of the stimulus
how do motile organisms respond to environmental changes?
by moving its whole body either towards a favourable stimulus or away from an unfavourable stimulus
what are the 2 ways taxes are classified by?
1. according to whether the movement is towards/away from the stimulus
2. the nature of the stimulus
what is it called when the movement is towards the stimulus?
what is it called when the movement is away from the stimulus?
when single-celled algae move towards light (positive phototaxis), how does this increase their chances of survival?
as they are photosynthetic and require light to produce their food
when earthworms move away from light (negative phototaxis), how does this increase their chances of survival?
as it takes them into the soil where they are better to conserve water, find food and avoid predators