Taxes and Kineses

The flashcards below were created by user camturnbull on FreezingBlue Flashcards.

  1. How can organisms increase their chances of survival?
    By responding to changes in their environment
  2. Define: Taxes
    The movement towards or away from a stimulus
  3. Give an advantage of taxes
    It may increase the chances of survival of an organism, driving it to move away from a source of danger or towards a food source
  4. Give an example of taxes
    • Earthworms move away from light 
    • This is known as negative phototaxis 
    • This movement increases their chances of survival as it takes them into the soil where they can conserve water and avoid predators
  5. Define: Kinesis
    An increased rate of movement or rate of turning in response to a stimulus
  6. What does Kinesis depend on?
    • The rate of kinesis depends on the stimulus intensity
    • The more unfavourable the stimulus, the greater the rate
    • This continues until favourable conditions are reached
  7. In which direction does an organism move during Kinesis?
    • Any direction
    • Kinesis is non directional
  8. Define: Tropism
    A growth response to a directional stimulus
  9. Give an example of a tropism
    • Plant shoots grow towards the light so they can photosynthesise (positive phototropism)
    • Plant roots grow away from the light (negative phototropism) and towards gravity (positive geotropism) and water (positive hydrotropism)
Card Set:
Taxes and Kineses
2014-03-02 19:47:16
Biology Taxes Kineses camturnbull

AQA BIOL5 Taxis and Kinesis
Show Answers: