Assessment 1 (March 2015)ScienceSecondary 21 hour

Name: ………………………………………… Class: …………………………

1 Diagram 1.1 shows the structure of the human ear.

Diagram 1.1

(a) On Diagram 1.1, tick (✔) the correct letters to show the organs that are involved in the mechanism of hearing.

[3 marks]

(b) Tick ( ) the functions of the part labelled ✔ B.

Amplifies sound vibrations

Channels sound waves to the eardrum

Converts sound vibrations into nerve impulses

Transfer sound vibrations to the oval window

[2 marks]

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DA

B

C

E

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(c) Mirah feels dizzy when she spins quickly for a few rounds as shown in Diagram 1.2.

Diagram 1.2

Inside your ears are tubes filled with a liquid. The liquid moves when you move, telling your brain what position your body is in. When you spin, the liquid also spins. The liquid continues to spin after you have stopped. Your brain thinks you’re still spinning, so you will feel that everything is going

in circles until the liquid stops moving.

By referring to Diagram 1.1, tick ( ) the part of the ear which is responsible for ✔the occurrence.

B D E

[1 mark]

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2 Diagram 2.1 shows the structure of the human eye.

Diagram 2.1

(a) On the diagram, tick (✔) the correct alphabets to show the parts that are involved in the human mechanism of sight.

[3 marks]

(b) Tick ( ) the correct functions of the part labelled ✔ D.

(i) Protects the eye and maintains the shape of the eye.

(ii) Supply nutrients and oxygen to the eye.

(iii) Detects images of the objects formed and changes them to nerve impulses.

(iv) Absorbs light and prevents reflection of light in the eye.

[2 marks]

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C

B

D

AE

F

G

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(c) Diagram 2.2 shows two types of vision defect, R and S that are commonly facing by humans.

Diagram 2.2

Tick ( ) one difference between the main cause of vision defect ✔ R and vision defect S.

(i) R occurs due to the eyeball that is too long whereas S occurs due to the eyeball that is too short.

(ii) R occurs due to the eyelens that is too thin whereas S occurs due to the eyeball that is too thick.

[1 mark]

(d) How can the vision defects in both R and S be corrected?

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Thick lens

Image focused in front of retina

Image focused behind retina

Light rays from distant object

Light rays from near object

R

S

Thin lens

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___________________________________________________________________

___________________________________________________________________

[2 marks]

3 Diagram 3 shows a section through the human skin.

Diagram 3

(a) Name all the labelled receptors.

P : ______________________________________________________

Q : ______________________________________________________

R : ______________________________________________________

S : ______________________________________________________

[4 marks]

(b) By making a suitable comparison, explain how the thickness of epidermis affects the sensitivity of the skin.

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

[4 marks]

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P Q R S

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(c) Our fingertips are known to have very high degree of sensitivity. State one benefit for such sensitivity.

___________________________________________________________________

___________________________________________________________________

[1 mark]

4 Diagram 4 shows an activity carried out by a student.

Diagram 4

(a) State the aim of the activity.

___________________________________________________________________

___________________________________________________________________

[1 mark]

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Glass

Plastic tube

StopwatchAsbestos sheet

Ear

Cloth

Plastic tube

StopwatchAsbestos sheet

Ear

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(b) State the variables involved in this activity.

(i) Constant : ___________________________________________

(ii) Manipulated : ___________________________________________

(iii) Responding : ___________________________________________

[3 marks]

(c) Write the observation for the activity in the table below.

Type of surface Observation

Glass

Cloth

[2 marks]

(d) Based on your observation, state the type of surface which is a better :

(i) sound reflector : _____________________________________

(ii) sound absorber : _____________________________________

[2 marks]

(e) What is produced when sound is reflected in caves? Why?

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

[2 marks]

(f) Taariq and his friends like to play different types of musical instruments especially during the weekends and holidays. However, most of the times, the neighbours would knock on his door to advise them to lower the noise. What can Taariq and his friends do to his room in order to reduce the noise?

___________________________________________________________________

___________________________________________________________________

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___________________________________________________________________

[3 marks]

5 Diagram 5 shows the apparatus set-up to investigate the response of plants to stimuli.

Diagram 5

(a) In the box provided in Diagram 5, draw one arrow to show the direction of growth of the roots after one week.

[1 mark]

(b) Give one reason for your answer in (a).

___________________________________________________________________

[1 mark]

(c) Name the type of tropism shown by the roots.

___________________________________________________________________

[1 mark]

(d) State one importance of the tropism in (c) to plants.

___________________________________________________________________

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Petri dish

Moist cotton wool

PlasticineSeedling

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(e) State two other responses of plants towards stimuli.

(i) _____________________________________________________________

(ii) _____________________________________________________________ [2 marks]

6 Read the passage below.

(a) Based on the passage, complete the pathway for the detection of smell.

Chemicals present in inhaled air.

Chemical particles enter

the ____________________.

Chemical particles dissolve

in the _______________________.

The ______________ identifies the smell.

Smell receptors are stimulated and send out ______________________________ to the brain.

[4 marks]

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The nose is the sensory organ that gives us the sense of smell. When we breathe, air enters through the nostrils into the nasal cavity. The roof of the nasal cavity has many sensnory cells or smell receptors to detect smell. This location allows smell receptors to have the maximum exposure to air currents. The smell receptors are sensitive to all kinds of smells.

The nasal cavity is also lined withMucus. Mucus warms and moisten air currentbefore it enters the lungs. Hairs in the nostriltrap dust and dirt in the air so that only clean air enters the lungs. Chemical particles, for example in food and flowers enter the nasal cavity. Chemicals dissolve in the mucus lining of the smell receptors. Smell receptors are stimulated and send out nerve impulses to the brain. The brain then identifies the smell.

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(b) Hana has flu. She doesn’t have the appetite to eat because food is tasteless to her. Explain why.

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

[2 marks]

(c) The sense of taste and the sense of smell help us to spit out food that is spoilt or smelly before we swallow it. Explain why this is important to us.

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

[2 marks]

END OF QUESTION PAPER

Prepared by, Checked by, Approved by,

________________ _________________ _______________(Ms Sue Soh Ya Lee) (Mr Leong Chee Fei) (Mr Rohaizi Rastam)Subject Teacher Curriculum Leader Head of Department

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