Waec Model Questions Vol1 2017 Biology Question 48

Practice objective / multiple choice question 48 from the 2017 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2017 Biology Objective / Multiple Choice Medium Difficulty
Question 48 WAEC_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • objective

When a person touches a hot surface, the withdrawal reflex is activated. The sensory nerve from the fingertip to the spinal cord is 1.2 m long and conducts at 50 m s⁻¹. The motor nerve from the spinal cord to the forearm muscles is 0.8 m long and conducts at 60 m s⁻¹. Each synapse in the spinal cord introduces a delay of 0.5 ms. (a) Calculate the total reaction time from stimulus to muscle contraction. (b) Identify the type of sensory receptor involved. (c) State whether the reflex is monosynaptic or polysynaptic.

Answer Options

A. Total reaction time ≈ 30 ms; Receptor = mechanoreceptor (touch); Reflex = monosynaptic
B. Total reaction time ≈ 45 ms; Receptor = thermoreceptor (heat); Reflex = polysynaptic
Correct Answer C. Total reaction time ≈ 38 ms; Receptor = nociceptor (pain); Reflex = polysynaptic
D. Total reaction time ≈ 52 ms; Receptor = proprioceptor (position); Reflex = monosynaptic
Correct Answer
C
Correct Option:
Total reaction time ≈ 38 ms; Receptor = nociceptor (pain); Reflex = polysynaptic

About This Question

This is Waec Model Questions Vol1 2017 Biology Question 48. It is one of the objective questions from the 2017 Waec Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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