11
How do we hear?
2
Classify the words in your notebook. Make two lists:
parts of the eye
and
parts of the ear.
opticnerve auditorynerve eardrum iris pupil cochlea retina lens
3
7
Listen and answer the questions.
a)
Cover your ears with your hands. What sounds do you hear?
b)
Listen again without covering your ears. Is it easier to identify the sounds with your ears
covered or not covered?
c)
8
T
h
i
n
k
!
With a partner, explain why. Then listen and check your ideas.
4
Find out why eyes are important. Take turns with a partner.
a)
Use a scarf to cover your eyes.
b)
Help your partner walk across the classroom.
c)
What do eyes help us do? What can’t we do without them?
Eyes help us …We can’t … without them.
5
Make a model of an ear with plasticine. Then, label the parts.
6
9
QUIZ
Check your learning.
A
C T I V I T I E S
1.
Sound waves go into our ear and hit the
eardrum
.
As a result, the eardrum vibrates.
2.
When the eardrum vibrates,
it makes the
small bones
inside the ear vibrate, too.
3.
The
cochlea
detects the vibrations and produces nerve
impulses. The
auditory nerve
transmits these impulses
to the brain. Then the brain interprets the information.
sound
auditory nerve
eardrum
cochlea
