Q. Consider the following activities:

1. Walking in a straight line
2. Riding a bicycle
3. Picking up a pencil

Which of the above activities are primarily controlled by the hind-brain?
Answer: All of the above
Notes: The hind-brain, particularly the cerebellum, regulates coordination and fine motor skills necessary for activities such as walking in a straight line, riding a bicycle, and picking up a pencil. All these movements involve balance, posture, and the smooth execution of voluntary muscular activity, which are functions attributed to the cerebellum.