Question

In a frog, the connection between brain and spinal cord is severed. Now a sharp needle is pricked to the leg of frog. Then it is most likely that the animal will?

• A. Not show any reaction
• B. Move the leg that is pricked
• C. Move the leg and feel the pain
• D. Do not move the leg but feel the pain

Answer 1

The correct option is B Move the leg that is pricked

Out of several types of reflexes, simple reflex or unconditioned reflex is the type that is controlled solely by the spinal cord and not the brain. So, if connection between brain and spinal cord is severed, reflexes controlled by spinal cord will run undisturbed, hence the leg of frog will move when pricked. But, no pain will be felt as pain sensation is controlled by brain.

So, the correct option is B.