Sc F2 - Chapter 1

Chapter 1 The World through Our Senses

Paper 1

Each question is followed by four options. Choose the best answer for each question.

1 Which of the following are human sense organs?I Eye lidsII EarsIII TongueIV SkinA I and III onlyB II and IV onlyC II, III and IV onlyD I, II, III and IV

2 Which of the following are parts of the human nervous system?I The brainII The spinal cordIII Peripheral nervesIV Neurons A I and II onlyB III and IV onlyC II, III and IV onlyD I, II, III and IV

3 Which part of the human body is the first to receive external stimuli?A The brain B The sensory organC EffectorsD Nerves

4

The figure above shows a cross-section of a human skin. Which of the parts labelled A, B, C or D, is most sensitive to pain?

© Pearson Malaysia Sdn Bhd 2007 Super Score Science Form 2

5 Why do different parts of our body have different levels of sensitivity to a stimulus?I There are different concentrations of receptors in different parts of our bodyII The epidermal layer is not uniformly thick III There are different stimuli receptors in our skinIV The pigmentation of the skin is not uniformA I and II onlyB III and IV onlyC II, III and IV onlyD I, II, III and IV

6

The figure above shows a cross-section of the human nose. What is the function of the part labelled P?A To send impulses to the brainB To produce mucusC To detect and identify smellsD To filter the air

7 When our nose produces too much mucus, we cannot smell well. What happens when our nose is completely dry?A Our nose can immediately detect smellsB Our nose will produce thin mucusC Our nose cannot detect smells D Our nose can only detect pleasant smells

8

The figure above shows parts of a tongue which are sensitive to four different tastes. What do M, N, O and P represent?


M N O PA Saltiness Sourness Sweetness BitternessB Bitterness Sourness Saltiness SweetnessC Sourness Bitterness Sweetness SaltinessD Bitterness Saltiness Sweetness Sourness

9 How are the tongue and the nose similar?I They are sensory organsII They identify stimuliIII They are affected by the sense of sightIV They are sensitive to chemical stimuliA I and III onlyB I and IV onlyC II, III and IV onlyD I, II, III and IV

10 Which of the following statement is true?I Echoes are reflected soundII Sound is produced by a vibrating objectIII The oval window in the ear changes vibrations into impulsesIV The eardrum vibrates and amplifies soundA I onlyB I and IV onlyC I, II and IV onlyD I, II, III and IV

11 Deafness could be caused by damage to theI eardrumII ossiclesIII cochleaIV semi-circular canalsA I and III onlyB I and IV onlyC I, II and III only D I, II, III and IV


12

The figure above shows a cross-section of the human ear. Which of the parts, labelled A, B, C or D, is not involved in the hearing mechanism?

13 Which of the following is not a part of the eye?A Conjunctiva B CorneaC CochleaD Choroid

14

The figure above shows a cross-section of the human eye. Which of the part labelled A, B, C or D, is most sensitive to light?

15 A student looks at a butterfly which is about 2 metres away from him. He removes his spectacles and looks closely at it. His friends call him from the far end of the school field and he turns to look at them. Which of the following shows the changes his eyes’ lenses undergo in the correct sequence?


A C

DB

16

The figure above shows a sight defect. What causes this sight defect? A Reading books in dim lightB A thick lensC A short eyeballD Fewer cells on the retina

17

Which of the following conditions cannot be aided by using any of the above instruments?I AstigmatismII Night blindnessIII Short sightedness IV Colour blindnessA I and III onlyB II and IV onlyC I, II and III onlyD I, II, III and IV

18 If you knock two stones together underwater, you will hear faint sounds above the water. However, if you blow a whistle underwater, no sound is heard above the water. What can you infer from these observations?A A whistle needs a vibrating air column to produce soundB Sound vibrations cannot be produced in waterC Sometimes, sound waves cannot travel through waterD Not enough energy is produced when a whistle is blown

19


Binoculars Telescope Microscope Hand lens Spectacles

The figure above shows a simple science activity. What inference can you make from this activity?I Sound travels in waves II Sound is produced through vibrationsIII Wood is a good sound reflectorIV Cotton wool is a good sound absorberA I and III onlyB II and IV only C I, II and III onlyD I, II, III and IV

20 Which of the following instruments can help humans overcome hearing limitations and hearing defects?I StethoscopesII Hearing aids III MicrophonesIV Loudspeakers A I and II onlyB III and IV onlyC I, II and III onlyD I, II, III and IV

21 How does a plant get mineral salts and water from the soil?A By positive phototropismB By positive hydrotropismC By positive geotropismD By positive thigmotropism

22 What part of the plant is described in the notes above?

A The shootsB The rootsC The tendrilsD The fruits


Shows positive phototropism Shows negative geotropism

23

The apparatus in the figure above was set up and left for five days. What will you observe after five days?A The shoots will grow upwards and the roots will grow to the rightB The shoots will grow upwards and the roots will grow downwardsC The shoots will grow upwards and the roots will grow to the leftD The shoots and roots will grow to the left

24

What response is shown by the plant shown in the figure above?A Seismonastic responseB Phototropism responseC Thigmotropism responseD Hydrotropism response

25 Which of the following movements shows tropism?I The leaves of a Mimosa pudica plant will close when they are touchedII The roots of a plant grow towards waterIII The tendrils of a plant grow towards a fenceIV The pitcher-plant traps an antA I and III onlyB II and III onlyC I, II and III onlyD I, II, III and IV


Paper 2

Answer all the questions.

Section A

1

The figure above shows a cross-section of the human ear.

(a) Give two reasons why the ear is important to human beings.

(b) Label the following parts on the figure.

(c) Lily noticed that her grandfather speaks to her very loudly. At first, she thought he

was shouting at her. Then, she realised that this was the way he normally talks.(i) Why do you think her grandfather speaks loudly?(ii) Explain your answer in (c) (i).(iii) What device should Lily’s grandfather use to help him overcome this

problem?

2


Ossicles cochlea semi-circular canals

The figure above shows a cross-section of the human eye.

(a) The eye is sensitive to which stimulus?

(b) Label the following parts on the figure above.

(c) What changes take place in our eyes when we(i) move from a dark place to a bright place?(ii) look at a distant object and then at a near object?

Section B

3 A student is blindfolded. The following objects were placed on his forearm, back of the hand and fingertip:

The student had to guess and identify the objects. The number of guesses he made before correctly identifying the objects is recorded in the table below.

Part of the bodyNumber of guesses

Pencil Marble Small notebookForearm 3 4 9Back of hand 7 3 11Fingertip 1 2 2

(a) What sense is being tested in this activity?

(b) What is the aim of this activity?

(c) What is the relationship between the number of guesses and how easy it was to identify the objects?

(d) Could the student use any other sense other than the sense of touch to identify the objects?

(e) What is the relationship between the part of the body used and how easy it was to identify the objects?

(f) Give two reasons to explain why fewer guesses were needed when objects were placed on the fingertip.


Ciliary muscles vitreous humour yellow spot

Pencil Marble Small notebook

(g) Name two other receptors that are present in the skin.4

The apparatus above was used in a science activity. The apparatus was set up and observed everyday for one week.

(a) What is the aim of this activity?

(b) What would most probably be used as the membrane in the activity, a plastic sheet or Visking tubing material?

(c) Draw the position of the roots and shoots after one week.

(d) State the (i) part of the plant that responds to light (ii) type of response involved

(e) State the (i) part of the plant that responds to water (ii) type of response involved

(f) Why are tropism responses important to plants?


Sc F2 - Chapter 1

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