11.1 Senses
and sense organs (P.141 - 144)
i Words to know:
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English term
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Write the words again
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Chinese term
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1
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Sense
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感覺
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2
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Detect
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探測 / 感應
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3
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Stimuli
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刺激
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4
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Respond
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作出反應
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5
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Sense
organ
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感覺器官
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6
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Receptor
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感受器
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7
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Sensitive
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敏感
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8
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Brain
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腦
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9
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Nerve
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神經
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10
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Interpreted
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詮釋
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i Fill in the blanks:
1 We
have different senses such as sight, hearing, smell, taste and
touch.
2 Changes in the environment are called stimuli. Living things
can detect and respond to them.
3 By responding to stimuli,
living things can find food, shelters, mates and escape from
danger.
4 We have different sense organs like eye, ear,
tongue, nose and skin. They contain special
kinds of cells called receptors which are
sensitive to particular kinds of stimuli.
5 When the receptors detect stimuli, they
send signals to our brain through nerves,
which are then interpreted to give us
senses.
i Matching:
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Stimuli
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•
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are the changes
in the environment which can be detected.
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Senses
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•
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let living
things know what the environment changes and so are important for living to
survive.
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Sense organs
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•
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are organs for
detecting stimuli.
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Receptors
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•
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are the special
kinds of cells in receptors which are sensitive to stimuli.
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Nerves
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•
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send signals
from receptors to the brain.
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Brain
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•
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interprets the
signals from sense organs and gives senses.
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i Fill in the table:
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Sense organ
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Stimuli
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Senses produced
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Eye
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Light
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Sight
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Ear
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Sounds
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Hearing
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Nose
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Chemicals in air
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Smell
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Tongue
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Chemicals in food or
drinks
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Taste
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Skin
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Things in contact with skin / temperature change
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Heat/cold, touch, pain,
pressure
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i Concept
checking:
Decide whether the following statements are
true or not and try to rewrite the correct statements.
1. Our sense organs can detect changes in our surroundings. True / False
___________________________________________________________________________________________
2. Humans have five sense organs: eye, ears, mouth, nose and skin. True
/ False
Humans have five sense orans: eye, ears,
tongue, nose and skin.
3. There are a lot of receptors in our sense organs. True / False
___________________________________________________________________________________________
4. Appropriate responses to stimuli are important to the survival of
animals. True / False
___________________________________________________________________________________________
5. Our sense organs are responsible for producing senses. True / False
Our brain is responsible for producing
senses / Our sense organs are responsible for detecting stimuli.
i Multiple
Choice (5 marks)
Circle the letter of the best answer for
each question.
1. To living things, a change in the surroundings is
called a __________________ .
A. sense B. stimulus C. response D. sense organ
2. Which of the
following descriptions about sense organs are correct?
(I) Sense
organs contain receptors.
(II) Sense
organs can produce senses.
(III) Sense
organs can produce signals.
A. (I)
and (II) only B. (I) and (III) only C. (II) and
(III) only D. (I), (II)
and (III)
3. Which of the following is NOT a stimulus
concerned with air that can be detected by
humans?
A. temperature
of air B. movement
of air
C. vibration
of air D. oxygen concentration of air
4. Senses can allow animals to…
(I) find
mates (II) find
shelters (III) escape
from dangers
A. (I) and (II) only B. (I) and (III) only C. (II) and
(III) only D. (I),
(II) and (III)
5. Which
of the following is/are NOT a sense organ/ sense organs?
(I) Skin (II) Brain (III) Tongue
A. (I) only B. (II)
only C. (III)
only D. (I)
and (II) only
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