science 1.2 ( eye )

Question 1

Front of the eye ( according to teacher nasha )
9M

Answer 1

Conjunctiva , cornea , aqueous humour , pupil , eye lens and vitreous humour , iris ,suspensory ligaments, ciliary muslce

Question 2

Back of the eye ( according to teacher nasha ) 6m

Answer 2

Sclera , choroid , retina ,yellow spot , optic nerve, blind spot

Question 3

Function of conjunctiva

Answer 3

transparent membrane which protects the front of the sclera

Question 4

Function of the cornea

Answer 4

a transparent layer which refracts and focuses light onto the retina

Question 5

Function of the Aqueous humor

Answer 5

1.transparent fluid which maintains the shape of the eyeball
2.focuses light into the eye

Question 6

Function of the pupil

Answer 6

opening in the centre of the iris which controls the quantity to light

Question 7

Eye lens

Answer 7

focuses lights onto the retina

Question 8

Vitreous humor

Answer 8

1. a transparent jelly substance which maintains the shape of the eyeball
2. focuses light onto the retina

Question 9

Function of the iris

Answer 9

the coloured part of the eye which controls the size of the pupil

Question 10

Function of suspensory ligaments

Answer 10

strong fibres which hold the eye lens in position

Question 11

Ciliary muscle

Answer 11

changes the thickness of the eye lens through contractions and relaxations

Question 12

Function of the Sclera

Answer 12

maintains the shape of the eye and protects it.

Question 13

Function of Choroid

Answer 13

1.Prevents reflection of light in the eye
2. supplies nutrient and oxygen to the eye

Question 14

Function of retina

Answer 14

a layer containing photoreceptors which detects light and produces nerve impulses

Question 15

Function of yellow spot

Answer 15

Part of retina which is most sensitive to light

Question 16

Function of optic nerve

Answer 16

Carries nerves impulses from the retina to the brain to be interpreted

Question 17

Function of Blind spot

Answer 17

Part of retina which is NOT sensitive to light because there are no photoreceptors an exit point for optic nerve fibers

Question 18

The retina has two types of photoreceptors :

Answer 18

1. Rod cell
2. cone cells

Question 19

Rod cells are sensitive to

Answer 19

different light intensities including faint light but not sensitive to the colours of light

Question 20

Cone cells are sensitive to

Answer 20

colours of light under bright conditions

Question 21

The light rays ( _____ ) to produce ( ______ ) that are sent to the brain

Answer 21

1. stimulate photoreceptors
2. nerve impulses

Question 22

( ______ ) from an object enter the eye through the ( ____ ) , ( ____ ) eye lens and vitreous humour before reaching the retina

Answer 22

1. Light rays
2. cornea
3. aqueous humour

Question 23

The brain interprets the ( ____ ). The small inverted image on the retina will then appear ( ___ )

Answer 23

1. nerve impulses
2. upright

Question 24

Limitation of sight consist of

Answer 24

Optical illusions and blindspots

Question 25

Optical illusions occur because

Answer 25

the brain is unable to accurately interpret the object seen by the eye due to the distractions around the eye

Question 26

The blind spot is a

Answer 26

point on the retina of the eye that CANNOT detect any images

Question 27

A short-sighted person is

Answer 27

someone who cannot see distant objects clearly ( my mom and dad core )

Question 28

Long sightedness is caused by the eye lens being too

Answer 28

too **thin** or the eyeball being too **short**

Question 29

Distant objects appear

Answer 29

blurry because the image is focused in **front** of the retina

Question 30

short sightedness is caused by the eyelens being ;

Answer 30

too **thick** or eye ball being too **long**

Question 31

Short-sightedness can be corrected by using

Answer 31

concave lens

Question 32

A long sighted person cannot see

Answer 32

objects near clearly ( my dad core )

Question 33

if objects are near ,the object seems

Answer 33

blurry because the image is focused **behind** the retina

Question 34

Long sightedness can be corrected using

Answer 34

convex lens

Question 35

Astigmatism is caused by the

Answer 35

uneven curvature of the **cornea** or **eye lens**

Question 36

astigmatism can be corrected by using

Answer 36

cylindrical lenses ( atp might be arissa if her eye sight gets worst )