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2024 AQA A LEVEL BIOLOGY CHAPTER 14 EXAM WITH CORRECT ANSWERS
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2024 AQA A LEVEL BIOLOGY CHAPTER 14 EXAM WITH CORRECT ANSWERS
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2024 AQA A LEVEL BIOLOGYCHAPTER 14 EXAM WITH CORRECT
ANSWERS
What is taxis? - CORRECT-ANSWERSa simple response whose direction is
determined by the direction of the stimulus. It can be positive or negative
taxis
Why do organisms respond to stimulus? - CORRECT-ANSWERSto increase
their chances of survival
Which branch of the ANS is responsible for fight or flight response? -
CORRECT-ANSWERSthe sympathetic branch (think sympathy is going to help
you)
Name the three types of neuron and their function in the relex arc -
CORRECT-ANSWERSsensory - carries impulses from the receptors towards
the CNS
intermediate neuron - links the sensory neuron to the motor neuron in the
spinal cord
motor neuron - carries nerve impulses from the spinal cord to the effectors
What is a pacinian corpuscle - CORRECT-ANSWERSThey're mechanorecptors
which detect mechanical stimuli eg pressure
-theyre found at the end of sensory nerve and wrap it in layers of lamellae
-when stimulated the stretch-mediated sodium ion channel is deformed
-sodium floods into cell and creates a generator potential
- if it reaches the treshold a action potential will be fired
How is light converted into electrical impulses? - CORRECT-ANSWERS1) light
enters the eye, hits the photoreceptors and is absorbed by light sensitive
optical pigments
2) the pigment is bleached, causes a chemical change that alterr membran
perm for sodium
3) a generator potential is created
4) sent along a bipolar neurone, connecting photoreceptors to optic nerve
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