Activity 11.1 p.142-143
1.
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(a)
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(b)
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(c)
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(d)
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(e)
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Sense
produced
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taste
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sight
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touch
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hearing
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smell
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Sense
organ used
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tongue
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eye
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skin
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ear
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nose
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2.
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Sense
produced
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a
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heat and cold
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b
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pain
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c
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pressure
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Checkpoint 11.1 p.144-145
1. eye, ear, nose, tongue, skin
2. brain
3. stimuli
4. receptor
5. pain, touch
Activity 11.2A p.146
(a) cornea
(b) white protective coat
(c) eye muscles
(d) optic nerve
(e) iris
(f) pupil
Experiment 11.2A p.147-149
2. It feels tough.
3. (a) A colourless liquid comes out.
(b) The front half of the eye collapses; the back half remains firm
and round.
5. (a) It is black.
(b) It is the pupil.
(c) It is colourless.
6. (a) (i) It is colourless.
(ii) The middle part of the lens is thicker.
(b) bigger
(c)
smaller
(d) bigger
7.
It is elastic and the shape can be changed slightly.
8.
Green and shiny
9. I see a small depression on the retina.
Activity 11.2B p.151-152
2. (i) smaller
(ii) less
3. (i) larger
(ii) more
Experiment 11.2B p.152-153
1. inverted
3. No
4. Yes
5.
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Object distance that gives
a sharp image (cm)
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Image distance (cm)
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Thick lens
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15
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30
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Thin lens
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30
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30
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n
With a greater object distance, a thinner lens is needed for focusing.
Checkpoint 11.2 p.155
1. (a) ii (b) iv (c) v (d) i (e) iii
E 2. B
Activity 11.3A p.156-157
1. (a) Yes
(b) (Answer depends on individual student.)
(b) (Answer depends on individual student.)
2. (b) (Answer depends on individual student.)
Activity 11.3B p.157
2. (Answer
depends on individual student.)
3. (a) (Answer depends on the banknote used, e.g.
in HSBC $100 notes, we can see ‘HSBC100 HSBC100……’.)
(b) too small
Activity 11.3C p.158
(a) microscope
(b) binoculars
(c) hand lens
(d) astronomical telescope
(e) electron microscope
Activity 11.3D p.159
No, I cannot see the
rabbit when the book is held at a certain distance.
Checkpoint 11.3 p.160
1. (a) True
(b) False
(c) True
(b) False
(c) True
E (d) False
2. (a) (i) close / near
(ii) far / distant
(iii) small
(ii) far / distant
(iii) small
E (b) blind spot
(c) instruments
Experiment 11.4 p.161-163
Activity 11.4A p.166
1. · People spend a lot of time
watching TV, the monitor of a computer,
or the monitor of a mobile phone.
or the monitor of a mobile phone.
· People spend a lot of time
reading for their studies or work.
· People do not aware of the
importance of care of eyes. Often, they do not have good habits for protecting
their vision when reading, watching television or using a computer.
2. · Potential problems with wearing
contact lenses: eye irritation, persistent redness, corneal ulcers, etc;
· Potential problems after LASIK
eye surgery: corneal infection, night-vision problems, halos, glare, dry eyes,
etc.
3. (any reasonable answer)
(or other reasonable answers)
(For the full version of suggested
answers, please refer to Activity Book 2B.)
Activity 11.4B p.168
(Answers
depend on the letters or figures perceived by the student.)
People having
normal vision should see:
(1) the numeral 6,
(2) the numeral 74,
(3) the letter C
(4) the outline of a heart.
(1) the numeral 6,
(2) the numeral 74,
(3) the letter C
(4) the outline of a heart.
Skill Development 11.4B p.169
Suggested answers:
· It is correct that the writings on the
blackboard look smaller at the back of the classroom.
· Betty is incorrect. A person with normal
eyesight should be able to see normal writings on the blackboard at the back of
the classroom clearly. Ben may actually have an eye defect.
· It is incorrect to ask Ben to try to focus on
the writings that he cannot see clearly, as this will make his eyes tired and
worsen the eye defect. Ben should see an optometrist and correct his eye
defect.
Checkpoint 11.4 p.170
1. (a) i (b) iii (c) iv (d) ii
2.
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Which position is the image of a distant object
formed?
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What lens should be used to correct the eye
defect, if any?
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(a) normal eyesight
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B
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-
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(b) short sight
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A
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concave lens
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(c) long sight
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C
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convex lens
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