The Senses - Eye

Question 1

Benefits of carnivores eyes?

Answer 1

• better judgement of distance
• better focus on prey

Question 2

Benefits of herbivores eyes?

Answer 2

• wider field of vision
• better detection of predators

Question 3

Functions of conjunctiva?

Answer 3

• protection against infections & irritants
• moistens & lubricates

Question 4

Function of sclera (sclerotic coat)

Answer 4

holds eye in shape

Question 5

Function of cornea?

Answer 5

lets light into the eye,
and bends it towards the retina

Question 6

Function of choroid?

Answer 6

ensures there’s no internal reflection of light inside the eye

Question 7

How does choroid absorb light in the eye?

Answer 7

contains black pigment called melanin

Question 8

How does choroid nourish the eye?

Answer 8

contains blood vessels

Question 9

Where are light receptors (rods & cones) located?

Answer 9

retina

Question 10

Are there more rods or cones?

Answer 10

rods

Question 11

What do rods detect?

Answer 11

black and white (vision)

Question 12

What do cones detect?

Answer 12

colour (vision)

Question 13

What light do rods work in?

Answer 13

dim light

Question 14

What light do cones work in?

Answer 14

bright light

Question 15

Where are rods found?

Answer 15

all over retina

Question 16

Where are cones found?

Answer 16

mostly at fovea

Question 17

Function of fovea?

Answer 17

images are focused/formed

Question 18

Is blind spot sensitive to light?

Answer 18

no

Question 19

Are there rods or cones or both in blind spot?

Answer 19

none

Question 20

What leave the blind spot through part of retina?

Answer 20

nerve fibres

Question 21

Nerve fibres leave through what in blind spot?

Answer 21

retina

Question 22

Function of optic nerve?

Answer 22

transmits impulses from the eye to the brain

Question 23

What happens if damage is done to optic nerve?

Answer 23

can’t transmit/no impulse

Question 24

Shape of lens?

Answer 24

curved

Question 25

Function of lens?

Answer 25

focus light on the retina

Question 26

What is accommodation (in ciliary muscle)?

Answer 26

the changing of shape of lens in a reflection action

Question 27

What is coloured part of the eye?

Answer 27

Iris

Question 28

What does iris control?

Answer 28

amount of light entering the eye

Question 29

Blue-eyed people have no what?

Answer 29

melanin

Question 30

When iris contracts, pupil...?

Answer 30

dilates

Question 31

When iris relaxes, pupil...?

Answer 31

constricts

Question 32

Opening of iris is called?

Answer 32

pupil

Question 33

What does pupil let into eye?

Answer 33

light

Question 34

Why is pupil black?

Answer 34

light normally emerges from the inside of eye

Question 35

3 reasons why having two eyes is good?

Answer 35

- depth perception - increase visual field - 3D vision

Question 36

Function of aqueous humour?

Answer 36

holds front of eye in shape

Question 37

What is aqueous humour?

Answer 37

salt solution

Question 38

Function of vitreous humour?

Answer 38

gives shape to eye

Question 39

How is the eye moved?

Answer 39

by use of six external muscles

Question 40

Benefit of 2 eyes?

Answer 40

allows 3D vision

Question 41

Comment on pupil size in dim light vs bright light.

Answer 41

dim light = dilates (bigger) bright light = constricts (smaller)

Question 42

Name the lens needed for short-sightedness.

Answer 42

concave

Question 43

Name the lens needed for long-sightedness.

Answer 43

convex