Form 2 Chapter 1

Form 2 Science Chapter 1

FORM 2 CHAPTER 1 THE WORLD AROUND US

1. Diagram 1 shows the structure of a human ear. P : ………………………………. Q : ……………………………….

R : ………………………………. S : ……………………………….

outer

middle

inner

Diagram 1

(a) On diagram 1, label structures P, Q, R and S using the following words. Cochlea

Ear ossicles

Semi – circular canals

Eustachian tube [4 marks]

(b) Draw lines to match the structures and their functions Structure

Function

P

Changes sound vibrations into nerve impulses

Q

Balances the air pressure on both sides of the eardrum

R

Amplifies sound vibrations

S

Helps to maintain the body balance [4 marks]

(c) Name two parts of the inner ear which are involved in the hearing mechanism. (i)

…………………………………………………………………………………………… ……

JPN Pahang 2009

60

Form 2 Science Chapter 1

(ii)

…………………………………………………………………………………………… ….. [2 marks]

2. Diagram 2.1 shows the parts of a human eye.

R : …………………………….

P Q

S : ……………………………

Q

DIagram 2.1 (a)

Label structures R and S in Diagram 2.1 using the following words. Cornea

Retina

Optic nerve

[2 marks] (b)

Based on structures P and Q in Diagram 2.1, complete Table 2.2. Name of structure

Function of structure

P Q Table 2.2 [4 marks] (c) What happens to Q when a person looks at a distant object?

………………………………………………………………………………………………

JPN Pahang 2009

61

Form 2 Science Chapter 1

[1 mark]

3. Diagram 3 shows the path of a light ray that enters a block of glass.

Q: ………………………………

P: ………………………………

Air

Glass R: ………………………………

Diagram 3.1

(a) Label Diagram 3.1 using the words in the box below. Incident ray

Refracted ray

Normal [3 marks]

(b) What causes the light ray to bend as it travels from air to glass? …………………………………………………………………………………………………… [1 mark] (c) Name two phenomena that are caused by the refraction of light. (i)

……………………………………………………………………………………………… …

(ii)

……………………………………………………………………………………………… … [2 marks]

(d) Complete Diagram 3.2 to show what happens to a light ray when it travels from glass to air. Air

Glass JPN Pahang 2009

62 Diagram 3.2

Form 2 Science Chapter 1

[1 mark] 4. Diagram 4 shows the set up of an experiment to investigate the response of seedling towards external stimuli.

Sunlight

Seedlings

Moist cotton wool

Wire gauge

Anhydrous Calcium chloride Diagram 4 (a) Name the two stimuli being investigated (i) …………………………………………………………….……………………………………… (ii) …………………………………………………………………………………………………… [2 marks] (b) Predict what will happen to the following parts of the seedlings after several days. (i) Shoots: ………………………………………………………………………………………… (ii) Roots : …………………………………………………………………………………………. [2 marks] (c) State the function of the anhydrous calcium chloride. ………………………………………………………………………………………………………… [1 mark] (d) Name the growth response shown by the

JPN Pahang 2009

63

Form 2 Science Chapter 1

(i)

shoots : …………………………………………………………………………………… …..

(ii) roots : ……………………………………………………………………………………….. [2 marks] 5. Diagram 5.1 shows the formation of image in the eye of a person with a vision defect.

Diagram 5.1 (a) (i) Name the vision defect shown in Diagram 5.1. …………………………………………………………………………………………………… [1 mark] (ii) Give one reason for this vision defect. ………………………………………………………………………………………………… [1 mark] (iii) How do you overcome this defect of vision? ………………………………………………………………………………………………….. [1 mark] (iv) Draw the correction of this vision defect as suggested in (a)(iii) on Diagram 5.2.

Diagram 5.2 JPN Pahang 2009

64

Form 2 Science Chapter 1

[2 marks]

(b) (i) Name the vision defect which is common among elderly people. …………………………………………………………………………………………………… [1 mark] (ii) Give one reason for your answer in (b)(i). …………………………………………………………………………………………………… [1 mark]

JPN Pahang 2009

65