What is a synapse?

Which of the following hormones is secreted by the posterior pituitary gland?

$(a)$ Name the part of the brain which controls:
$(i)$ voluntary actions,
$(ii)$ involuntary actions.
$(b)$ What is the significance of the peripheral nervous system? Name the components of this nervous system and distinguish between the origin of the two.

Name the system which facilitates communication between the central nervous system and the other parts of the body. Mention two types of nerves it consists of along with their organ of origin.

Which of the following statements about the transmission of a nerve impulse is incorrect?

The main function of abscisic acid in plants is to