" 1.How does Evelyn hear music? "

How do we hear sound?

How old was Evelyn when she went to the Royal Academy of Music?

How does the hearing or auditory sensation occur?

How ear helps in hearing ?

How does the musical sound differ from the noise?

Explain the following : (a) How does the middle ear help in hearing ? (b) Why does vitamin A deficiency produce night-blindness ? (c ) What is the role of lacrimal gland ? (d) How does the iris adjust the size of the pupil ?