What is a synapse?

Which of the following statements are true about the brain?
$(i)$ The main thinking part of the brain is the hindbrain.
$(ii)$ Centres of hearing,smell,memory,sight,etc.,are located in the forebrain.
$(iii)$ Involuntary actions like salivation,vomiting,and blood pressure are controlled by the medulla in the hindbrain.
$(iv)$ Cerebellum does not control posture and balance of the body.

How many lobes does the surface of the cerebral hemisphere possess?

$(a)$ Give the functions of cerebellum. (any two)
$(b)$ Name the components of central nervous system.

Dramatic changes of body features associated with puberty are mainly because of the secretion of:

Write the main functions of the following :
$(a)$ Sensory neuron
$(b)$ Cranium
$(c)$ Vertebral column
$(d)$ Motor neuron