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Name the glands that secrete : (i) Adrenaline (ii) Thyroxin
Explain with example how the timing and amount of hormone released are regulated in the human body.
Sense organ in which olfactory receptors are present is :
Taking the example of any two animal hormones along with their gland of secretion, explain how these hormones help (i) in growth and development and (ii) regulate metabolism, in the body.
Define a reflex arc. Why have reflex arcs evolved in animals ? Trace the sequence of events which occur, when you suddenly touch a hot object.
Name the part of nervous system which helps in communication between the central nervous system and other parts of the body. What are the two components of this system ?
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