Which of the following helps in maintaining the posture and balance of the human body?

The shape of guard cells changes due to change in the :

Define phototropism and give one example.

State whether the following statement is true or false: Blood pressure,salivation,and vomiting are controlled by the cerebrum.

$(i)$ Differentiate between sensory neurons and motor neurons.
$(ii)$ How is the brain protected in our body?
$(iii)$ Name the part of the brain responsible for the precision of voluntary actions and maintaining body posture and balance of the body.

What does the central nervous system in humans consist of?