This document contains information about the structures and functions of the human ear, eye, and vision defects. It includes diagrams of the ear labeling the cochlea, ear ossicles, semi-circular canals, and Eustachian tube. It also has diagrams of the eye labeling the retina and cornea. The document discusses light refraction when passing from air to glass and glass to air. Additionally, it covers a experiment on seedling response to stimuli and the use of anhydrous calcium chloride. Finally, the document addresses myopia and how it can be corrected along with a common vision defect among elderly people.

1. Form 2 Science
Chapter 1
FORM 2 CHAPTER 1
THE WORLD AROUND US
1. 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 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) …………………………………………………………………………………………………
(ii) ………………………………………………………………………………………………..
[2 marks]
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Diagram 1
P : ……………………………….
Q : ……………………………….
R : ……………………………….
S : ……………………………….
outer middle inner

2. Form 2 Science
Chapter 1
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 Cornea 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?
………………………………………………………………………………………………
[1 mark]
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DIagram 2.1
P
R : …………………………….
S : ……………………………Q

3. Form 2 Science
Chapter 1
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 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.
[1 mark]
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Air
Glass
P: ………………………………
Q: ………………………………
R: ………………………………
Diagram 3.1
Air
Glass
Diagram 3.2

4. Form 2 Science
Chapter 1
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]
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Sunlight
Seedlings
Moist cotton
wool
Wire gauge
Anhydrous
Calcium chloride
Diagram 4

5. Form 2 Science
Chapter 1
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]
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Diagram 5.1
Diagram 5.2

6. Form 2 Science
Chapter 1
(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]
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7. Form 2 Science
Chapter 1
(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]
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