F2 IS 2nd Term WS11 11.2 Answers

11.2    How we see

i      Words to know:

	English term	Write the words again	Chinese term
1	Cornea		角膜
2	Iris		虹膜
3	Pupil		瞳孔
4	Lens		晶狀體
5	Retina		視網膜
6	Yellow spot		黃點
7	Blind spot		盲點
8	Optic nerve		視神經

i      Label the diagrams:

i      Matching:

i    Fill in the blanks:

1          In our eye, the cornea / lens, the lens / cornea, and the liquid in front of and behind the lens are transparent that they allow light to pass through and helps to focus light onto the retina.

2       Pupil is a hole that allows light to enter the eye. Its size is controlled by iris.

3       Retina contains light receptors that can detect light and produce signals.

4       Yellow spot is the part of the retina which gives the clearest vision, while

         blind spot is the part of the retina which contains no light receptors and gives no vision.

5       Optic nerve carries signals from the retina to the brain.

i    Short questions:

1.       How can our eyeball move?

The contractions of the eye muscles attached on the eyeball control the movement of the eyeball.

2.       What is the function of the white protective coat of our eye?

It protects and gives shape to the eyeball.

3.       Which part of our eye is like a hole and allows light to enter the eyeball?

Pupil

4.       Which part(s) of our eye help(s) to focus light?

Cornea, lens, jelly-like liquid

5.       Which part of our eye detects light?

Retina

6.       Which part of the retina cannot detect light? Why?

Blind spot cannot detect light because it does not contain any light receptor.

7.       Which part of the eye sends the signals from the retina to the brain?

Optic nerve