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Grade 8: Science > Unit C: Section 4.0 > Flashcards

Unit C: Section 4.0 Flashcards

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Biology 101 flashcards
1
Q

What is the function of the cornea?

A

Protect all the sensitive parts of the eye

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2
Q

What is the function of the iris?

A

To control the size of the pupil

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3
Q

What is the function of the pupil?

A

To let in more or less light

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4
Q

What is the function of the ciliary muscle?

A

To make the lens thicker or thinner

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5
Q

What is the function of the lens?

A

To focus the light onto the retina

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6
Q

What is the purpose of the retina?

A

To send the image to the optic nerve

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7
Q

What is the function of the optic nerve?

A

To send the image to the brain

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8
Q

What does it mean when the pupil dilates?

A

Becomes bigger

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9
Q

Which part of the camera is like the retina?

A

The film

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10
Q

What part of the camera is like the iris?

A

The diaphragm

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11
Q

What part of the camera is like the eyelid?

A

The shutter

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12
Q

What part of the camera is like the lens?

A

The lens!

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13
Q

What part of the camera is like the pupil?

A

The aperture

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14
Q

What is the retina?

A

It is the sensitive layer that like strikes. It is filled with photo receptors

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15
Q

What are rods sensitive to?

A

Light

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16
Q

What are cones sensitive to?

A

Color

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17
Q

Why can’t you see colors in the dark?

A

Because comes don’t work very well in low light

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18
Q

What happen when light strikes the retina?

A

The photoreceptors send light to the optic nerve

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19
Q

What is farsightedness?

A

When the light doesn’t focus early enough

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20
Q

What is nearsightedness?

A

When the light focuses to early

21
Q

How is farsightedness corrected?

A

It is fixed with convex lenses

22
Q

How is nearsightedness corrected?

A

It is fixed with concave lenses

23
Q

How does laser eye surgery work?

A

The surgeon uses a laser to reshape the cornea

24
Q

How do night vision goggles work?

A

Light goes through light intensifiers and then through a phosphor screen which causes them to glow green

25
Q

What are the parts of the eye?

A 
Cornea
Iris
Pupil
Lens
Ciliary muscle
Retina
Optic nerve
26
Q

What are camera eyes?

A

Any eye that has a cornea, lens, and a retina

27
Q

How many comes do humans have?

A

3: each different ones sense red, green, blue

28
Q

How many different cones do birds have?

A

5

29
Q

What is tapetum lucidum?

A

It’s basically a mirror inside the eye that reflects light outside of the eye

30
Q

What organisms have compound eyes?

A

Insects and crustaceans

31
Q

What is a compound eye?

A

Eyes that are made of many ommatidium

32
Q

What does an ommatidium look like?

A

A long tube with a lens on the outer surface

33
Q

What are advantages to compound eyes?

A

You can see in all directions

You can see motion very well

34
Q

What are downsides to compound eyes?

A

Can’t form a single image

35
Q

What are camera eyes?

A

Any eye that has a cornea, lens, and a retina

36
Q

How many comes do humans have?

A

3: each different ones sense red, green, blue

37
Q

How many different cones do birds have?

A

5

38
Q

What is tapetum lucidum?

A

It’s basically a mirror inside the eye that reflects light outside of the eye

39
Q

What organisms have compound eyes?

A

Insects and crustaceans

40
Q

What is a compound eye?

A

Eyes that are made of many ommatidium

41
Q

What does an ommatidium look like?

A

A long tube with a lens on the outer surface

42
Q

What are advantages to compound eyes?

A

You can see in all directions

You can see motion very well

43
Q

What are downsides to compound eyes?

A

Can’t form a single image

44
Q

What is digital imaging?

A

The process of creating a big picture out of small images

45
Q

What happens when a computer receives an image?

A

It divides them into pixels and then changes it to numbers

46
Q

What does a computer do to tell color?

A

It assigns the color a number

47
Q

What is the resolution?

A

It refers to the number of pixels per unit area

48
Q

What is the difference between cameras and digital cameras?

A

Instead of light falling on agile it falls onto a charge-coupled device or CCD

49
Q

How does a charge coupled device work?

A

As light falls into each square it creates a small amount of electricity. It’s then created into digital information like numbers

Grade 8: Science (18 decks)

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