Neco 2020 Biology Question 8

Practice essay / theory question 8 from the 2020 Neco Biology examination. This question covers Coordination, Nervous system, Reflex arc, Motor response .

Neco 2020 Biology Essay / Theory

Topics: Coordination Nervous system Reflex arc Motor response

Question 8 NECO • 2020 • BIOLOGY • essay

A frog is startled when a small insect lands on the dorsal surface of its thigh. The frog quickly jumps away. Using this scenario, answer the following questions.

Question Parts

( a )

Outline the neural pathway that conveys the tactile stimulus from the skin to the contraction of the hind‑limb muscles that produce the jump.

( ) Name the type of receptor that detects the touch.

( ) Identify the afferent (sensory) neuron, the central processing unit and the efferent (motor) neuron involved.

( ) State the type of muscle fibre that contracts to generate the rapid jump.

( b )

Explain how the speed of this response is achieved, referring specifically to synaptic transmission and the role of the spinal cord.

( c )

If the frog’s spinal cord were transected at the lumbar region, describe how its ability to respond to the same stimulus would change. Indicate which components of the pathway would be lost and the expected behavioural outcome.

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About This Question

This is Neco 2020 Biology Question 8. It is one of the essay questions from the 2020 Neco Biology examination.

The question covers Coordination, Nervous system, Reflex arc, Motor response .

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