True or False Answers

Senses

1. We can use different organs to detect stimuli

at the same time.

True

2. Images cannot be formed on the blind

spot.

False

3. There are cells which detect light all over the

retina.

False

4. The cause of cataract is the whitening of the

Cornea.

False

5. When you look at near by objects, the lenses in your eyes

become thicker.

True

6. A human eye changes the thickness of its lens

during focusing.

True

7. A person cannot see near objects clearly. He can wear glasses with concave lenses.

False

8. The Cochlea in the ear transmits and amplifies

the vibrations.

False

9. In the eye, the pupil may be brown, blue or

green in colour.

False

10. When a long-sighted person looks at near

objects, light rays will focus behind the retina.

True

11. Microscopes form images which are bigger

than the object.

True

12. There are small numbers of light-sensitive

cells at the blind spot.

False

13. The iris controls the size of the pupil.

True

14. The retina contains rods which can detect light.

True

15. When a person suffers cataract, his lens

becomes cloudy.

True

16. The thickness of the lens in the eye is controlled

by the focusing muscle.

True

17. Color blindness can be corrected by wearing

special glasses.

False

18. The chance of a male being colour-blind is greater

than that of a female.

True

19. Human beings cannot see vary far at

night.

True

20. Short sight can be corrected by wearing

glasses with convex lenses.

False

21. Cataract is the clouding of the eye lens.

True

22. The front part of the eye is covered by the cornea which is brown or blue.

False

23. Short-sightedness can be corrected by convex lenses.

False

24. Our lens becomes thicker when we look at

near objects.

True

25. Different animals have different hearing

ranges.

True

26. Sound cannot travel in space with no

particles.

True

27. The unit of frequency is decibel

(dB).

False

28. A tuning fork with higher frequency is shorter and can

produce a note of higher pitch.

True

29. Sound can travel through air and liquid but it

cannot travel through a solid.

False

30. Different people have ranges of hearing. The upper

limit of young people is higher than that of the elderly

people.

True

31. The middle ear is filled with liquid.

False

32. Sound cannot travel through a vacuum.

True

33. Different animals have different ranges of

audible frequencies.

True

34. All sounds are produced by vibrations.

True

35. Frequency is the number of vibrations per minute.

False

36. The ear bones in the middle ear can change the vibrations into a message

which is then carried by the auditory nerve to the brain.

False

37. The pinna changes sound waves into

vibration.

False

38. Sound cannot travel through solid.

False

39. The unit of frequency is hertz (Hz).

True

40. Sound can travel through vacuum.

False

41. Sound cannot travel through liquid.

False

42. The audible frequency of human beings is between

20 Hz to 20,000 Hz.

True

43. Bats have the widest audible range.

True

44. Noise can cause deafness, but it is annoying.

False

45. The function of the ear bones is to transmit the vibrations only.

False

46. The human nose can detect four kinds of taste.

False

47. Each taste bud is a taste receptor which detects taste.

False

48. The only function of the human skin is to detect

pain, pressure, touch and temperature.

False

49. Each taste bud contains 30 taste receptors.

False

50. The sweet receptors are located in the front of the tongue.

True

51. The human skin can keep out germs.

True

52. Different parts of our bodies are not equally sensitive to touch.

True

53. Tongue can detect four different tastes.

True

54. Our skin has four different types of sense receptors.

False

55. Our skin is very reliable in detecting hot

and cold.

False

56. Medulla is responsible for controlling heartbeat

and breathing.

True

57. Alcohol can affect nerve cells. It can slow down our response and

affect our judgement.

True

58. Adding Sodium Chloride to hydrochloric acid is an

example of neutralization.

False

Sentence completion

1. The retina contains

Light-sensitive cells

2. The iris controls

the size of the pupil.

3. The blind spot has

no light-sensitive cells.

4. The lens can change its

thickness.

5. The optic nerve sends

messages to the brain

6. The cornea is

the transparent part of the eye.

7. The eyelids prevent

foreign objects from entering the eye.

8. The iris may be

blue or brown in colour.

9. The size of the pupil is controlled by

the iris.

10. The thickness of the lens is controlled by

focusing muscle

Identify the function

1. Pinna

Collect sound waves

2. Ear canal

Facilitates the travelling of sound waves

3. Ear bones

Transmit the vibrations and magnify them

4. Eardrum

Changes sound waves into vibrations

5. Auditory nerve

Carries the message to the brain

6. Cochlea

Detects vibrations and changes them into a message

Multiple Choices

1. Which of the following matchings between sense organs and receptors is correct?A. Eye LensB. Ear Ear-drumC. Nose NostrilsD. Tongue Taste buds

D

2. Which of the following apparatus can be used to observe tiny objects?

(1) Magnifying glass(2) Telescope(3) Microscope

A. (1) and (2) only.B. (1) and (3) only.C. (2) and (3) only.D. (1), (2) and (3)

B

3. Which of the following eye defects can be corrected by wearing suitable glasses?

(1) Astigmatism(2) Short sight(3) Long sight(4) Colour blindness

A. (1) and (2) onlyB. (2) and (3) only C. (1), (2) and (3) onlyD. (1), (2), (3) and (4)

C

4. Which of the following is/are correct methods of protecting the eyes?

(1) Eating enough food that contains vitamin A(2) Using distilled water to wash the eyes

everyday(3) Reading under intense light(4) Avoiding sitting in front of the computer

monitor for a long timeA. (1) and (4) only C. (2), (3) and (4) onlyB. (1), (2) and (4) only D. All of these

A

5. Which structure of the eyeball is related to the formation of short sight and long sight?A. Pupil C. LensB. Iris D. Retina

C

6. Which of the following structures contain/s light sensitive cells?

(1) Retina(2) Lens(3) Iris

A. (1) only C. (2) and (3) onlyB. (1) and (3) only D. All of these

A

7. If we are seeing a car that approaches us slowly, what changes will occur to the structures of the eyeball below?A. Contracts becomes thickerB. Contracts becomes thinnerC. Relaxes becomes thickerD. Relaxes becomes thinner

A

8. Astronauts cannot talk to each other in space becauseA. there is no air.B. all the sound energy loses to the space.C. the astronaut cannot move properly in space.D. the sound is absorbed by the space.

A

9. Which of the following options are needed to achieve a full sense of balance?

(1) Semicircular canals(2) Medulla(3) Cerebellum

A. (1) only C. (1) and (3) onlyB. (3) only D. All of these

D

10. All of the following structures enable the detection of sound vibrations?A. Pinna C. Ear bonesB. Ear canal D. Cochlea

D

11. Which of the following functions of the ear bones is/are correct?

(1) To transmit the sound vibrations(2) To amplify the sound vibrations(3) To support the ear drum

A. (1) only C. (1) and (2) onlyB. (2) only D. All of these

C

12. Which of the following structures carries message directly to the brain?A. Auditory nerve C. Ear bones B. Cochlea D. Eardrum

A

13. A person suffering from a cold cannot taste food properly becauseA. the tongue is damaged.B. the tongue is covered by a layer of white substance.C. the medicine stops the sense of taste.D. the sense of smell and the sense of taste have to work together to detect the flavour of food.

D

14. Which of the following parts of a mammal is NOT sensitive to touch?A. skin C. NailB. Tongue D. Nose

C

15. Which of the following is/are the harmful effect(s) of drug abuse?

(1) unable to concentrate(2) damage to the brain(3) damage to memory and response

A. (2) only C. (2) and (3) onlyB. (1) and (2) only D. All of these

A

Good Luck!!!