Workbook Answers: Ch11

Sectional Exercise
Section 11.1
A. Concept checking p.61
1. False
2. True
3. True
4. False
5. True

B. Questions p.61
1. (a) sight; eyes
(b) hearing; ears
(c) heat; skin
(d) smell; nose
(e) taste; tongue
(f) touch; skin
2. (a) Eyes, tongue or nose
(b) Nose or skin
(c) Tongue
(d) Skin
(e) Ears
(f) Nose or tongue

Section 11.2
A. Concept checking p.62
1. False
2. True
3. False
4. False
5. False

B. Multiple choice p.63
1. C
2. A
3. D
4. D

C. Matching p.64
(a) i, iv
(b) ii, iii
(c) ii, iv
(d) i, iii

D. Questions p.65
1. (a) A : cornea B : iris
D : pupil E : lens
G : retina H : yellow spot
I : blind spot J : optic nerve
(b) (i) A, C , E and F
(ii) G
(iii) E
(c) It protects the eyeball and gives it shape.
2. (a) R
(b) Q
(c) P, R and S

Section 11.3

A. Concept checking p.67

1. True

2. False

3. False

4. False

5. True

B. Matching p.67

(a) Telescope; i, iv

(b) Binoculars; i

(c) Hand lens; ii

(d) Light microscope; iii

Section 11.4

A. Multiple choice p.68

1. B

2. D

3. A

4. A

5. D

B. Fill in the blanks p.70

(a) (i) near

(ii) thin

(iii) short

(iv) convex

(b) (i) certain colours

(ii) cones

(c) (i) cataracts

(ii) artificial lens

(d) (i) distant

(ii) thick

(iii) long

(iv) concave

Integrated Exercise

A. Multiple choice p.84

1. D

2. C

3. D

4. B

5. C

6. A

7. D

8. C

B. Fill in the blanks p.90

1. (a) sight

(b) light receptors

(c) retina

(d) optic nerve

(e) blind spot

C. Questions p.91

1. (a) Stimulus/stimuli: Temperature of water

Sense organ(s): Skin

Sense(s): Heat and cold

(b) Stimulus/stimuli: Chemicals / citric acid / lemon juice in the drink

Sense organ(s): Tongue

Sense(s): Taste

(c) Stimulus/stimuli: Chemicals / LPG / town gas in air

Sense organ(s): Nose

Sense(s): Smell

(d) Stimulus/stimuli: Light and sound / thunder and lightning

Sense organ(s): Eyes and ears

Sense(s): Sight and hearing

2. (a) P : lens; Q : cornea; R : iris; S : optic nerve

(b) (i) P , Q and T

(ii) This allows light to pass through.

(c) Retina. It contains light receptors that can detect light and send signals to the brain.

(d) (i) This point is called the blind spot.

(ii) No, we cannot see the object. The reason is that there are no light receptors on 

                        the blind spot, no signals are produced when the light from an object is focused on it.

Quick Review

A. Sensing the environment p.97

(a) stimuli

(b) receptors

(c) brain

(d) senses

(e) responses

B. Our senses p.97

(b) (i) sound receptors

(ii) cochlea

(c) (i) smell receptors

(ii) nose

(d) (i) taste receptors

(ii) taste bud

(e) skin