Page 18 - Syok Praktis PBD (2023) Science TH4

ANSWERS

Practice Practice
1 Scientific Skills 2 Humans

1.1 Scientific Process Skills 2.1 Human Breathing Process
A 1. (a) Sense of sight A 1. Nose
(b) Sense of hearing 2. Trachea
(c) Sense of smell 3. Lungs
(d) Sense of taste Inhalation
(e) Sense of touch Exhalation
(f) Sense of hearing
B 1. (i) inhaling
2. (a) boils, does not boil (ii) moving upwards
(b) (i) The temperature of the water (iii) oxygen
(ii) manipulated 2. (i) exhaling
(c) higher (ii) moving downards
(d) boil
(iii) carbon dioxide
3.
C 1. Activity: Medium
Length Weight Volume Temperature Rate of breathing: Medium
2. Activity: Not strenuous
Rate of breathing: Low
3. Activity: Strenuous
(a) (b) (c) (d) Rate of breathing: High
100 ml 4. Activity: Medium
90
80
70 Rate of breathing: Medium
60
50 5. Activity: Not strenuous
40
30
20 Rate of breathing: Low
10
6. Activity: Strenuous
0
Rate of breathing: High
2.2 Excretion and Defecation
g cm ºC ml
A 1. (i) Urine
4. (a) Prediction (ii) Sweat
(b) Hypothesis (iii) Carbon dioxide, Water vapour
(c) Variable (iv) Faeces
(d) Inference 2. waste product, body
(e) Hypothesis 3. faeces, body
(f) Prediction 4. wastes, undigested
(g) Inference 5. produced, removes
6. Kidney stones
Summative Practice 1 2.3 Response towards Stimuli
A
Objective Questions
Involved
1. A 2. C 3. A 4. D 5. B Situation Stimuli Response
sensory organ
Subjective Questions 1. Bad smell from Nose Hand closes
1. (a) Presence of sunlight and water the rubbish bin the nose
(b) (i) P and R, Q and S 2. The sound of Ears Hands closes
(ii) P and S, Q and R construction work the ears
(c) Q because plant Q obtained sufficient sunlight and
water 3. The hot kettle Skin Hand is moved
2. (a) (ii) 3 away
(b) Decreases and increases 4. The sour taste of Tongue Scrunched up
(c) Puteri Islam the lemon face

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Answers.indd 1 27/09/2022 2:04 PM