Survival & Response (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
What is a stimulus?
What is a stimulus?
A detectable environmental change that triggers a reaction
What is the response pathway?
What is the response pathway?
Stimulus → Receptor → Coordinator → Effector → Response
What is a taxis?
What is a taxis?
Directional movement towards or away from a stimulus
What is positive taxis?
What is positive taxis?
Movement towards the stimulus
What is negative taxis?
What is negative taxis?
Movement away from the stimulus
What is a kinesis?
What is a kinesis?
Non-directional response that changes movement patterns
How do organisms respond to unfavourable conditions in kinesis?
How do organisms respond to unfavourable conditions in kinesis?
Increase speed and turning frequency
What is a tropism?
What is a tropism?
Growth response in plants to directional stimuli
How do shoots respond to light (phototropism)?
How do shoots respond to light (phototropism)?
Positive phototropism (grow towards light)
How do roots respond to gravity (gravitropism)?
How do roots respond to gravity (gravitropism)?
Positive gravitropism (grow downwards with gravity)