plumiResponding to stimuli and the reflex arc: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 8.1.2 Responding to stimuli and the reflex arc, 2019–2025, with mark schemes and examiner’s reports where available.
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Q3(a)(i)
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All 13 questions on Responding to stimuli and the reflex arc, as a list
- January 2024, Unit 5, Q3(a)(i) (1 mark): Which receptors detect a change in light intensity and stimulate an action potential? (1) A baroreceptors B chemoreceptors C osmoreceptors D photoreceptors
- January 2024, Unit 5, Q3(a)(ii) (3 marks): A reflex arc carries a nerve impulse from receptors in the skin to the central nervous system in a human. Describe the structures that a nerve impulse passes th
- January 2024, Unit 5, Q4(a)(i) (1 mark): Which is the ratio of the action potentials produced at 48 °C by nociceptors compared with thermoreceptors? (1) A 0.40 : 1 B 2.0 : 1 C 2.07 : 1 D 2.1 : 1
- January 2024, Unit 5, Q4(a)(ii) (4 marks): Nociceptors are better than thermoreceptors at preventing serious damage to tissues at high temperatures. Comment on the extent to which the results of this inv
- October 2023, Unit 5, Q8(c) (3 marks): Describe how the fascia generates a ‘diffuse pain’ (paragraphs 8 and 9). (3)
- January 2023, Unit 5, Q3(b) (3 marks): Describe the structure of a spinal reflex arc. (3)
- October 2022, Unit 5, Q8(c) (3 marks): Explain how capsaicin could activate nerve cells causing a pain sensation (paragraph 4). (3)
- October 2022, Unit 5, Q8(e) (3 marks): Explain how mechanical stimuli, e.g. pressure, are converted into electrical signals in cells (paragraphs 5 and 7). (3)
- June 2022, Unit 5, Q8(e) (4 marks): Explain how reflex circuits in the gut cause a bolus to move (paragraphs 10 and 11). (4)
- January 2022, Unit 5, Q3(a)(ii) (1 mark): A beluga whale can respond to a stimulus using a spinal reflex arc. Which row is correct? (1) Location of cell body on Location of relay neurone the sensory neu
- June 2021, Unit 5, Q2(a)(i) (1 mark): Which component of the nervous system continues a reflex arc immediately after the receptor has been stimulated by the stimulus? (1) A motor neurone B relay neu
- June 2021, Unit 5, Q2(a)(ii) (1 mark): Which pathway shows a reflex arc? (1) A muscle receptor brain B muscle spinal cord brain C receptor spinal cord muscle D spinal cord brain muscle
- June 2021, Unit 5, Q2(b)(ii) (3 marks): Suggest how a change in pressure at the Pacinian corpuscle causes an action potential in the axon. (3)
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