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Science questions, unit 3
Nama / NameKelas / ClassTarikh / Date

Humans

27 marks. Use Practice to check each answer as you go, or Exam to answer everything first and check at the end.

Section A: objective questions

8 marks
Choose the best answer for each question.
1

Question 1

Diagram 1 shows the teeth in a mouth. What is the function of tooth X?
An open mouth with one pointed tooth beside the front teeth labelled X
Diagram 1
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C
Tooth X is pointed and sits beside the front teeth, so it is a canine. Canines tear food. Incisors cut and molars grind.
For the teacher: Remembering, low difficulty, standard 3.1.1
Textbook p. 30
2

Question 2

Which part of a tooth is the hard, white outside layer?
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B
Enamel is the hard, white outside layer of a tooth. Dentine is under it.
For the teacher: Remembering, low difficulty, standard 3.1.2
Textbook p. 32
3

Question 3

Which sentence about milk teeth is correct?
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D
Milk teeth start to grow at 6 months old. There are 20 of them. They are small, with thin enamel and dentine.
For the teacher: Understanding, medium difficulty, standard 3.1.3
Textbook p. 35
4

Question 4

Which food belongs to the carbohydrate class?
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A
Rice is a carbohydrate. Fish is protein, cooking oil is fats and cabbage is fibre.
For the teacher: Remembering, low difficulty, standard 3.2.1
Textbook p. 40
5

Question 5

Why do we need to eat fibre?
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C
Fibre prevents constipation. Carbohydrate gives energy, protein is for growth and fats warm the body.
For the teacher: Understanding, low difficulty, standard 3.2.2
Textbook p. 43
6

Question 6

Diagram 2 shows Ali eating. He eats food like this every day and does not brush his teeth. What will most likely happen to Ali?
A boy eating ice cream with cakes and sweets on the table
Diagram 2
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A
Eating many sweet foods and not cleaning the teeth causes tooth decay.
For the teacher: Applying, low difficulty, standard 3.2.4
Textbook p. 47
7

Question 7

In which part of the body are nutrients absorbed?
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D
Nutrients from digested food are absorbed in the intestine.
For the teacher: Remembering, low difficulty, standard 3.3.3
Textbook p. 52
8

Question 8

Diagram 3 shows Hafiz eating fried chicken while he runs. What may happen to Hafiz?
A boy running while eating fried chicken
Diagram 3
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B
Eating while running disturbs digestion. It can cause vomiting and stomach ache.
For the teacher: Understanding, medium difficulty, standard 3.3.4
Textbook p. 54

Section B: structured questions

19 marks
Answer all questions. Circle the right answer or write your answer in the space.
9

Question 9

Diagram 4 shows two sets of teeth, P and Q.
P: a small mouth with fewer teeth. Q: a bigger mouth with more teeth
Diagram 4
[1 mark] (a)Set P is the
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milk teeth set
P is smaller and has fewer teeth, so it is the milk teeth set.
[1 mark] (b)How many teeth are there in set Q?
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32
Q is the permanent teeth set: 8 incisors + 4 canines + 20 molars = 32 teeth.
[1 mark] (c)Which set has a long life span?
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Q
Permanent teeth (Q) last a long time. Milk teeth (P) have a short life span.
For the teacher: Remembering, low difficulty, standard 3.1.3
Textbook p. 35
10

Question 10

Diagram 5 shows the cross section of a tooth.
Cross section of a tooth with five parts labelled P, Q, R, S and T
Diagram 5
[1 mark] (a)Name part P.
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Tick each point you got.
[1 mark] (b)Name part R.
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Tick each point you got.
For the teacher: Remembering, low difficulty, standard 3.1.2
Textbook p. 32
11

Question 11

Diagram 6 shows four kinds of dental treatment, P, Q, R and S.
Four pictures: a tooth with a filling, teeth with braces, false teeth, and a tooth having root canal treatment
Diagram 6
[1 mark] (a)Which picture shows braces?
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Q
Braces are wires on the teeth that straighten them (Q). P is a filling, R is dentures, S is root canal treatment.
[1 mark] (b)We should go to the dentist for a check-up once every six months.
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True
[1 mark] (c)Why must we floss our teeth?
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Any 1 points
Tick each point you got.
For the teacher: Understanding, low difficulty, standard 3.1.4
Textbook p. 38
12

Question 12

Siti eats nasi lemak at the school canteen. Choose the class of food for each part of her meal.
[1 mark] (a)Fried egg
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Protein
Eggs are protein. Protein is for growth.
[1 mark] (b)Rice
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Carbohydrate
Rice is a carbohydrate. It gives us energy.
[1 mark] (c)Cucumber
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Fibre
Cucumber is a vegetable. Vegetables give fibre (and vitamins).
For the teacher: Applying, low difficulty, standard 3.2.1
Textbook p. 43
13

Question 13

Diagram 7 shows the Malaysian Food Pyramid. It has four levels, P, Q, R and S.
Food pyramid: P at the top with oil, salt and sugar; Q with fish, meat and milk; R with fruits and vegetables; S at the bottom with rice, bread and potatoes
Diagram 7
[1 mark] (a)We should eat the least food from level
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P
Level P (top, level 4) is the smallest: fat, oil, salt and sugar. Eat less.
[1 mark] (b)Why must we eat only a little of the food in level P?
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Any 1 points
Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 3.2.3
Textbook p. 44
14

Question 14

Diagram 8 shows the parts of the body that food passes through.
A boy with five digestive parts labelled P, Q, R, S and T
Diagram 8
[1 mark] (a)Name part Q.
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Tick each point you got.
[1 mark] (b)Undigested food leaves the body through part
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T
T is the anus. Food the body does not need leaves as faeces.
For the teacher: Remembering, low difficulty, standard 3.3.2
Textbook p. 50
15

Question 15

Diagram 9 shows Mei Ling's lunch: rice, fried fish, tempeh, green vegetables and watermelon.
A plate with rice, fried fish, tempeh, green vegetables and watermelon
Diagram 9
[1 mark] (a)Is this a balanced meal?
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Yes
[1 mark] (b)Give one reason for your answer.
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Any 1 points
Tick each point you got.
For the teacher: Evaluating, high difficulty, standard 3.2.3
Textbook p. 45
16

Question 16

Ahmad often eats only fried chicken and drinks sweet drinks for breakfast.
[2 marks] (a)Plan a balanced breakfast for Ahmad. Write three foods or drinks.
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Any sensible meal with food from different levels of the pyramid. Plain water instead of a sweet drink is a good choice too.
Tick each point you got.
For the teacher: Creating, high difficulty, standard 3.2.3
Textbook p. 45