F2Sc 09Ch 1

Form 2 Science

Chapter 1

FORM 2 CHAPTER 11. Diagram 1 shows the structure of a human ear.

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

Ear ossiclesSemi circular canalsEustachian tube

[4 marks] (b) Draw lines to match the structures and their functions

StructureFunction

PChanges sound vibrations into nerve impulses

QBalances the air pressure on both sides of the eardrum

RAmplifies sound vibrations

SHelps to maintain the body balance

[4 marks](c) Name two parts of the inner ear which are involved in the hearing mechanism.(i) (ii) ..

[2 marks]2. Diagram 2.1 shows the parts of a human eye.

Q

(a)Label structures R and S in Diagram 2.1 using the following words.Retina

CorneaOptic nerve

[2 marks](b)Based on structures P and Q in Diagram 2.1, complete Table 2.2.

Name of structureFunction of structure

P

Q

Table 2.2

[4 marks]

(c)What happens to Q when a person looks at a distant object?

[1 mark]3. Diagram 3 shows the path of a light ray that enters a block of glass.

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

Refracted rayNormal

[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.

[1 mark]

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

(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 (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.

(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.

[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]

Diagram 1

P : .

Q : .

R : .

S : .

outer

middle

inner

DIagram 2.1

P

R : .

S :

Q

Q:

P:

Air

Glass

R:

Diagram 3.1

Air

Glass

Diagram 3.2

Sunlight

Seedlings

Moist cotton wool

Wire gauge

Anhydrous Calcium chloride

Diagram 4

Diagram 5.1

Diagram 5.2

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