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Science questions, unit 2
Nama / NameKelas / ClassTarikh / Date

Humans

41 marks. Use Practice to check each answer as you go, or Exam to answer everything first. Ask a grown-up to help you mark the written answers.

Section A: objective questions

10 marks
Choose the best answer for each question.
1

Question 1

In which organ does the exchange of gases take place?
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B
Oxygen enters the lungs and carbon dioxide leaves the lungs, so the exchange of gases takes place in the lungs.
For the teacher: Remembering, low difficulty, standard 2.1.2
Textbook p. 27
2

Question 2

Which shows the passage of air during inhalation?
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D
Air enters through the nose, passes down the trachea and reaches the lungs.
For the teacher: Remembering, low difficulty, standard 2.1.2
Textbook p. 28
3

Question 3

How is exhaled air different from inhaled air?
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A
Exhaled air has more carbon dioxide and less oxygen than inhaled air. It still has some oxygen.
For the teacher: Understanding, low difficulty, standard 2.1.3
Textbook p. 29
4

Question 4

A boy puts his hand on his chest and breathes slowly. What happens to his chest when he exhales?
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C
The chest moves upwards when we inhale and downwards when we exhale.
For the teacher: Understanding, low difficulty, standard 2.1.4
Textbook p. 31
5

Question 5

Diagram 1 shows the chest movements of a pupil in one minute. How many chest movements did the pupil make while skipping?
Bar chart: sitting 18, skipping 40, sprinting 52 chest movements in one minute
Diagram 1
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B
The bar for skipping reaches 40.
For the teacher: Applying, low difficulty, standard 2.1.5
Textbook p. 34
6

Question 6

Which of these is a stimulus?
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A
A stimulus is a change in the surroundings. The other three are actions, which are responses.
For the teacher: Understanding, low difficulty, standard 2.3.1
Textbook p. 43
7

Question 7

Which pair of excretory organ and product is correct?
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D
Kidneys excrete urine, the skin excretes sweat, and the lungs release carbon dioxide and water vapour.
For the teacher: Remembering, low difficulty, standard 2.2.2
Textbook p. 38
8

Question 8

What is defecation?
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C
Defecation is the removal of faeces through the anus.
For the teacher: Understanding, low difficulty, standard 2.2.1
Textbook p. 37
9

Question 9

Which habit can make a person respond slowly to stimuli?
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A
Glue contains chemicals that disturb the sensory organs and the brain, so response is slow.
For the teacher: Analysing, medium difficulty, standard 2.3.4
Textbook p. 47
10

Question 10

Hana smells smoke in her house, runs outside and calls for help. Why is it important for her to respond?
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B
Responding to the smell of smoke helps her to save herself from danger.
For the teacher: Applying, medium difficulty, standard 2.3.3
Textbook p. 46

Section B: structured questions

31 marks
Answer all questions. Circle the answer or write it in the space.
11

Question 11

Diagram 2 shows some organs involved in human breathing.
A body outline with the nose labelled P, the trachea labelled Q and a lung labelled R
Diagram 2
[1 mark] (a)Name organ P.
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Nose
[1 mark] (b)Name organ Q.
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Trachea
[1 mark] (c)Name organ R.
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Lung
[2 marks] (d)Arrange P, Q and R in the correct order for the passage of air during exhalation.
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Tick each point you got.
[1 mark] (e)What may happen to a person who is always exposed to polluted air?
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Tick each point you got.
For the teacher: Remembering, low difficulty, standard 2.1.1
Textbook p. 51
12

Question 12

Diagram 3 shows an investigation on the effect of the type of activity on the rate of breathing of a pupil.
Bar chart: sitting 18, skipping 40, sprinting 52 chest movements in one minute
Diagram 3
[1 mark] (a)State one observation.
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Tick each point you got.
[1 mark] (b)State one inference.
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[1 mark] (c)How many more chest movements does the pupil make when sprinting than when sitting?
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[1 mark] (d)What conclusion can be drawn from this investigation?
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For the teacher: Analysing, medium difficulty, standard 2.1.5
Textbook p. 52
13

Question 13

Answer these questions about inhaled air and exhaled air.
[1 mark] (a)Which gas is present in more amount in inhaled air than in exhaled air?
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Oxygen
[1 mark] (b)Which gas is present in more amount in exhaled air?
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Carbon dioxide
[1 mark] (c)Name the organ where the exchange of gases takes place.
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Tick each point you got.
[2 marks] (d)State two ways to keep the lungs healthy.
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Any 2 points
Haze and smoke harm the lungs, so keep away from them and keep the air clean.
Tick each point you got.
For the teacher: Understanding, low difficulty, standard 2.1.3
Textbook p. 29
14

Question 14

Diagram 4 shows three excretory organs: the lungs, the skin and the kidneys.
A boy with the lungs, the skin and the kidneys shown and named
Diagram 4
[1 mark] (a)What is excretion?
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Tick each point you got.
[1 mark] (b)What is defecation?
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Tick each point you got.
[1 mark] (c)What does the skin excrete?
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Tick each point you got.
[2 marks] (d)What do the lungs release?
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Tick each point you got.
[1 mark] (e)Why must faeces be removed from the body?
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Tick each point you got.
For the teacher: Remembering, low difficulty, standard 2.2.2
Textbook p. 38
15

Question 15

Diagram 5 shows a girl in a rose garden. She touches a rose stem and reacts at once.
A girl in a rose garden pulls her hand away from the thorny stem of a rose
Diagram 5
[1 mark] (a)Which sensory organ receives the stimulus?
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Skin
We feel touch and pain with our skin.
[2 marks] (b)State the stimulus and the response.
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Tick each point you got.
[1 mark] (c)Why is the response important to the girl?
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Tick each point you got.
For the teacher: Applying, medium difficulty, standard 2.3.1
Textbook p. 43
16

Question 16

Two pupils talk about habits. Imran says: "Glue sniffing is harmless because I only do it once." Hana says: "Cough syrup is a medicine, so it is always safe to drink a lot."
[1 mark] (a)Is Imran correct?
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No
Glue chemicals can cause hallucination and addiction and disturb the sensory organs and the brain.
[2 marks] (b)Explain why Hana is not correct.
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Tick each point you got.
For the teacher: Evaluating, high difficulty, standard 2.3.4
Textbook p. 47
17

Question 17

Your school is making a poster to teach Year 4 pupils to protect their sensory organs and their response to stimuli.
[1 mark] (a)Name one habit that pupils must avoid.
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Tick each point you got.
[2 marks] (b)Write a short slogan for the poster and say why the habit must be avoided.
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Tick each point you got.
For the teacher: Creating, medium difficulty, standard 2.3.4
Textbook p. 48