Senses

Question 1

What is the trigger for a sense called?

Answer 1

Stimulus/stimuli

Question 2

Why are senses important?

Answer 2

Because it helps living things escape from danger, search for food and find mates.

Question 3

What are the five senses in humans?

Answer 3

Sight, hearing, smell, taste and touch.

Question 4

Signals are transmitted through the ______ to the brain to produce a sense.

Answer 4

nerves

Question 5

What are the five sense organs in humans?

Answer 5

Eyes, nose, ears, skin and tongue.

Question 6

Eyebrows prevents ______ from getting into the eyes.

Answer 6

sweat

Question 7

Eyelashes prevents ______ from getting into the eyes.

Answer 7

small particles

Question 8

Eyelids can close to protect the eyes from ___a___ and ___b___, and it can blink to help ___c___ the eye surface.

Answer 8

a) dirt
b) strong light
c) moisten

Question 9

Focusing muscle changes the ___a___ of the ___b___.

Answer 9

a) thickness
b) lens

Question 10

Cornea lets light pass through and helps ______ light.

Answer 10

focus

Question 11

Iris controls the ______ of the pupil.

Answer 11

size

Question 12

Pupil ___a___ the amount of ___b___ light entering the eye.

Answer 12

a) regulates
b) light

Question 13

Lens lets light pass through and helps ______ light.

Answer 13

focus

Question 14

Jelly-like fluid maintains the ______ of the eyeball and helps focus light.

Answer 14

shape

Question 15

______ protects the eyeball.

Answer 15

Sclera

Question 16

___a___ contains ___b___ cells that detect ___c___ and produce ___d___.

Answer 16

a) Retina
b) light-sensitive
c) light
d) signals

Question 17

Blind spot is where the spot where the ___a___ leaves the eyeball. There are no ___b___ cells in that spot.

Answer 17

a) optic nerves
b) light-sensitive

Question 18

___a___ nerve ___b___ signals from light sensitive-cells to the ___c___.

Answer 18

a) Optic
b) transmits
c) brain

Question 19

What three parts help focus (bend) light onto the retina?

Answer 19

The cornea, the lens and the jelly-like fluid.

Question 20

The image formed on the retina is upright. True/False

Answer 20

False. The image formed on the retina is inverted.

Question 21

When we look at a near object, the focusing muscles ___a___ and the lens becomes ___b___.

Answer 21

a) contract
b) thicker

Question 22

When we look at a distant object, the focusing muscles ___a___ and the lens becomes ___b___.

Answer 22

a) relax
b) thinner

Question 23

What are the two types of light-sensitive cells on the retina?

Answer 23

Cone cells and Rod cells.

Question 24

What are the features of cone cells and rod cells?

Answer 24

Cone cells work in bright light and it can detect colour while rod cells work in dim light and cannot detect colour.

Question 25

Our eyes have limitations, but what are the perspectives that we can’t see?

Answer 25

Objects that are too small, too close or too far away.

Question 26

What can we use to extend our vision?

Answer 26

We can use optical instruments.

Question 27

What causes short sight?

Answer 27

The lens being too thick, or the eyeball being too long, or both.

Question 28

Where is the image formed when one has short sight and how to correct it?

Answer 28

In front of the retina. Concave lenses can correct short sight.

Question 29

What causes long sight?

Answer 29

The lens being too thin, or the eyeballs being too short, or both.

Question 30

Where is the image formed and how can we correct long sight?

Answer 30

Behind the retina. Convex lenses can correct long sight.

Question 31

What are 5 common eye defects?

Answer 31

Short sight, long sight, astigmatism, cataract and colour-blindness.

Question 32

What are the symptoms of astigmatism?

Answer 32

Blurred vision.

Question 33

What is the cause correction of astigmatism?

Answer 33

The cornea or the lens being unevenly curved. Glasses with different curvatures at different points can be used to correct it.

Question 34

What is the cause and correction of cataract?

Answer 34

The lens being cloudy. Replacing a cloudy lens with artificial ones can be used as correction.

Question 35

What is colour-blindness and why is it not possible to correct.

Answer 35

Colour-blindness is caused by one or more types of cone cells not working and it’s not possible to correct because it’s inherited.

Question 36

What are five precautions to maintain good eyesight?

Answer 36

1. Take breaks after using the eyes intensively
2. Keep a distance between subject and eyes
3. Read in appropriate amounts of light
4. Have regular eye check-ups
5. Protect your eyes from direct sunlight