Which system facilitates the communication between the central nervous system and other parts of the body?

Explain how the movement of leaves of a sensitive plant is different from the movement of shoots towards light.

What constitutes the central and peripheral nervous systems? How are the components of the central nervous system protected?

Give a reason to explain why:
$(i)$ Adrenaline helps in dealing with emergency situations?
$(ii)$ Secretions of growth hormone should be specific in the human body?
$(iii)$ Some patients of diabetes are treated by giving injections of insulin?

What is a tropic movement? Explain with an example.

Answer the following:
$(a)$ Name the endocrine gland associated with the brain.
$(b)$ Which gland secretes digestive enzymes as well as hormones?
$(c)$ Name the endocrine gland associated with the kidneys.
$(d)$ Which endocrine gland is present in males but not in females?