24-25 S2 2nd term Sci Exam Revision (Eyes and Ears)

Human have 5 senses for detecting stimuli in the environment.

Which of the following matchings between sense organs and stimuli is correct?

• A

• B

• C

• D

• E

Astigmatism (散光) is caused by the unevely curved lens or cornea. It cannot be corrected by wearing suitable glasses.

• True

• False

Which of the following apparatus can be used to observe animal cells?

• Binoculars

• Hand lens

• Microscope

• Telescope

Which of the following are correct methods of protecting the eyes?

(1) Do not rub our eyes with hand.

(2) Wear sunglasses to protect our eyes from strong light.

(3) Eating enough food that contains vitamin A.

(4) Using distilled water to wash the eyes every day

• (1), (2) and (4) only

• (1), (3) and (4) only

• (1), (2) and (3) only

• (1), (2), (3) and (4) only

We cannot perceive the image that falls on the blind spot, because

• no image can be formed on the blind spot.

• the light-sensitive cells cannot sent signals to the brain.

• there are no light-sensitive cells on the blind spot.

• it is where the optic nerve leaves the eye.

Which of the following will happen when a person is looking at a distant object?

(1) The lens relaxs.

(2) The ciliary muscles (focusing muscles) relax.

(3) The len becomes thinner

• (1) and (3) only

• (1) and (2) only

• (2) and (3) only

• (1), (2) and (3)

Evan is now entering a dark room. Which of the following statements must be

correct?

(1) His pupils become larger.

(2) The rod cells become more essential in sensing the sight in the room.

(3) The focusing muscle is contracting.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Jane suffers from an eye defect that she cannot see distant objects clearly.

Which of the following is/are the cause(s) of this eye defect?

(1) The lens being too thin

(2) The lens being too thick

(3) The eyeball being too short

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

According to the diagram showing how the light rays go through the eyeball of Peter, which of the following combinations is correct?

• A

• B

• C

• D

Draw a labelled diagram to show how short sight can be corrected with suitable lens.

Answer explanation

Label the diagram:

• - Light ray from distant object (1)

• - Concave lens (1)

• - Thick lens (1)

Ray diagram***USE RULER*** :

• - Light from distant object (1)

parallel lines 平行線

Lens for correction of short sight:

• - Concave lens 凹透鏡 (1)