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

Humans

44 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

8 marks
Choose the best answer for each question.
1

Question 1

Which male reproductive organ produces sperms?
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A
The testes produce sperms. The penis only transfers them into the female parent.
For the teacher: Remembering, low difficulty, standard 2.1.1
Textbook p. 14
2

Question 2

Diagram 1 shows the female reproductive organs. Which letter is the organ where the embryo develops and grows?
Female reproductive organs with P on an ovary, Q on the uterus, R on a Fallopian tube and S on the vagina
Diagram 1
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B
Q is the uterus (womb). The embryo develops and grows there.
For the teacher: Understanding, low difficulty, standard 2.1.1
Textbook p. 15
3

Question 3

In which part of the female reproductive system does fertilisation take place?
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C
A sperm fuses with an ovum in the Fallopian tube.
For the teacher: Remembering, low difficulty, standard 2.1.2
Textbook p. 16
4

Question 4

What is formed when a sperm fuses with an ovum?
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D
The fertilised ovum is called a zygote. It later divides to form an embryo.
For the teacher: Understanding, low difficulty, standard 2.1.2
Textbook p. 16
5

Question 5

Which parts make up the central nervous system?
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A
The central nervous system is the brain and the spinal cord. The nerves form the peripheral nervous system.
For the teacher: Understanding, low difficulty, standard 2.2.1
Textbook p. 21
6

Question 6

Which of these is an involuntary action?
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B
The heart beats without us thinking about it. The other three are voluntary actions.
For the teacher: Applying, medium difficulty, standard 2.2.2
Textbook p. 23
7

Question 7

Diagram 2 shows three reflex situations. In the third picture, a boy touches a hot kettle and pulls his hand away at once. Which part of the body gives the command for this response?
Three reflex situations; the last shows a boy touching a hot kettle
Diagram 2
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C
Pulling away is a reflex action. The spinal cord receives the signal and sends the command, so it is very quick.
For the teacher: Applying, medium difficulty, standard 2.2.2
Textbook p. 24
8

Question 8

Why should a motorcyclist wear a helmet?
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D
The brain is part of the nervous system. A helmet protects it from injury in an accident.
For the teacher: Understanding, low difficulty, standard 2.2.5
Textbook p. 27

Section B: structured questions

36 marks
Answer all questions. Circle the answer or write it in the space.
9

Question 9

Diagram 3 shows the female reproductive organs. Name the organs and state what they do.
Female reproductive organs with P on an ovary, Q on the uterus, R on a Fallopian tube and S on the vagina
Diagram 3
[1 mark] (a)Name organ P.
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Ovary
[1 mark] (b)State the function of P.
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Tick each point you got.
[2 marks] (c)A woman has both of her P removed because of a health problem. Can she become pregnant naturally? Explain.
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Tick each point you got.
For the teacher: Remembering, low difficulty, standard 2.1.1
Textbook p. 15
10

Question 10

The statements below describe what happens from fertilisation to birth. Number them 1 to 5 in the correct order.
[1 mark] (a)The embryo develops into a foetus in the uterus.
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4
[1 mark] (b)The sperms swim towards the ovum.
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2
[1 mark] (c)The mother gives birth to a baby.
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5
[1 mark] (d)The penis transfers sperms into the vagina.
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1
[1 mark] (e)The zygote divides to form an embryo.
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3
[1 mark] (f)About how many months does the foetus stay in the uterus?
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 2.1.2
Textbook p. 17
11

Question 11

Aini says that a baby gets its food and oxygen through its mouth and nose before it is born.
[1 mark] (a)Is Aini correct?
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No
[1 mark] (b)Name the part that joins the foetus to its mother.
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[2 marks] (c)State two things that this part does.
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Any 2 points
Tick each point you got.
For the teacher: Applying, medium difficulty, standard 2.1.2
Textbook p. 17
12

Question 12

Encik Ahmad and his wife have three children. Imagine that no human on Earth could reproduce.
[1 mark] (a)What would happen to the number of humans in the world over many years?
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Tick each point you got.
[1 mark] (b)What would finally happen to the human species?
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[1 mark] (c)State one reason why reproduction is important.
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Any 1 points
Tick each point you got.
For the teacher: Evaluating, medium difficulty, standard 2.1.3
Textbook p. 18
13

Question 13

Answer these questions about the human nervous system.
[1 mark] (a)The system made of the brain and spinal cord is the ____ nervous system.
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central
[1 mark] (b)The system made of a network of nerves is the ____ nervous system.
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peripheral
[2 marks] (c)State the function of the peripheral nervous system.
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Tick each point you got.
[1 mark] (d)Name the part of the central nervous system that carries information between the body and the brain.
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 2.2.1
Textbook p. 21
14

Question 14

Siti looks at a rose in the garden on purpose. Diagram 4 shows how the signal travels.
Flow: stimulus, sensory organ, brain, response
Diagram 4
[1 mark] (a)Name the sensory organ that detects the rose.
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Tick each point you got.
[1 mark] (b)Name the part of the body that receives the signal and coordinates the response.
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Tick each point you got.
[1 mark] (c)Looking at the rose is a voluntary action. What is a voluntary action?
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[1 mark] (d)Give one example of an involuntary action.
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For the teacher: Analysing, low difficulty, standard 2.2.2
Textbook p. 22
15

Question 15

Hamid accidentally steps on a sharp nail and lifts his foot at once.
[1 mark] (a)What type of action is this?
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Reflex action
[2 marks] (b)Arrange the signal pathway: spinal cord, response, stimulus, sensory organ.
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[1 mark] (c)Why is a reflex action important?
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For the teacher: Applying, high difficulty, standard 2.2.2
Textbook p. 24
16

Question 16

A man has Bell's palsy. One side of his face droops and he cannot close one eye.
[1 mark] (a)Which system is damaged?
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Peripheral nervous system
The nerves that control the face muscles are part of the neural network.
[1 mark] (b)Give one other problem that may happen when nerves in the legs are damaged.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 2.2.4
Textbook p. 25
17

Question 17

Danial wants to keep his nervous system healthy.
[1 mark] (a)How many hours of sleep a day does he need?
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7 to 8 hours
[2 marks] (b)Give two other ways he can take care of his nervous system.
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Any 2 points
Tick each point you got.
[1 mark] (c)Why should he avoid alcoholic drinks?
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Tick each point you got.
For the teacher: Creating, medium difficulty, standard 2.2.5
Textbook p. 26