AQA Biology Unit 5

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1. Define Taxis

  • A movement that bares some relationship to the location of the stimulus
  • The growth of a plant in response to a directional stimulus
  • Movement towards sunlight for photosynthesis
  • Random movement in response to a stimulus
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2. How does panting lead to heat loss?

  • Evaporation of water from the lining of the mouth, heat transferred from blood
  • Causes vasoconstriction
  • Increases thirst so organism drinks more to cool self down
  • Activates the heat gain centre in hypothalamus

3. What is meant by refractory period?

  • No new action potentials produced in this time
  • Polarisation
  • A levels that needs to be over come to produce a action potential
  • Threshold potential

4. Define Kinesis

  • A growth movement of part of a plant in response to a directional stimulus
  • A non-directional response to a stimulus
  • Ability to influence/manipulate/move matter with ones mind
  • A directional response to a stimulus

5. Why do cone cells have a higher level of visual acuity?

  • Several cone cells are connected to one bipolar cell
  • Each cone cell is conneted to an individual neurone
  • Rhodopsin is bleached at a high light intenisty
  • Rhodopsin is bleached at a low light intenisty




sass master, good quiz though thank you

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