Unit B: Section 2.0 Flashcards Preview

Grade 8: Science > Unit B: Section 2.0 > Flashcards

Flashcards in Unit B: Section 2.0 Deck (47):
1

What does the eyepiece of a microscope do?

Contains the lens that magnifies.

2

What does the coarse adjustment knob do?

Moves the stage up or down to focus the object to produce a flat sharp image.

3

What does the fine adjustment knob do?

Brings the object into sharper focus

4

What does the revolving nosepiece do?

Holds the three objective lenses

5

What do the objective lenses do?

Provides different strength of magnification

6

What does the stage do?

Supports the slide that holds the object you want to view.

7

What do the stage clips do?

Hold the slide firmly on the stage

8

What does the diaphragm do?

Has different sizes holes that let different amounts of light pass through the object

9

What does the lamp do?

Supplies the light that passes through the object you're viewing

10

What does the arm do?

Allows you to carry the microscope securely

11

What does the base do?

Serves as a foundation for the rest of the microscope

12

What factors affect your ability to see the internal parts of cells?

The type of microscope
The power of the lenses
The quality of the prepared slides

13

What are organelles?

Specialized structures that carry out specific functions

14

What is the function of the nucleus?

A command center that directs all the organelles

15

What is the function of the mitochondria?

Converts nutrients into energy

16

What is the function of the cells membrane?

Let's materials in and waste out

17

What are the functions of the vacuoles?

Store nutrients and water

18

What is the function of the cytoplasm?

Contains nutrients required to carry out life proses

19

What is the function of the cell wall?

It provides strength and support to plants

20

What are the functions of the chloroplasts?

Convert the Suns energy into food

21

What are the functions of the ribosomes?

Make proteins

22

What is the function of the lysosomes?

Destroy waste

23

What does multicellular mean?

They are made up of two or more cells

24

What does unicellular mean?

They are made up of only a single cell

25

Do you think that multicellular organisms are more advanced than unicellular organisms?

No, because unicellular can do everything a multicellular organism can do. Multicellular organisms depend on specialized cells to function.

26

What cell uses pseudopods?

Amoeba

27

How does amoeba capture food?

They use their pseudopods to surround it

28

How do paramecium move?

They use hair like structures as oars

29

How does paramecium eat?

It uses its cilia to sweep food into its oral groove

30

What is diffusion?

The movement of particles from an area of high concentration to an area of low concentration

31

How is a cell membrane selectively permeable?

It has small holes to let certain things in but small enough to keep the organelles and cytoplasm from coming out.

32

What is osmosis?

The diffusion of water particles of a selectively permeable membrane

33

What does a microscope do?

A microscope magnifies the images of small objects.

34

Why do cells reproduce?

To replace the ones that die every day and to repair damaged ones

35

What is the function of red blood cells?

To carry oxygen to all the cells of the body

36

How do red blood cells reproduce?

When they get big enough they lose their nucleus. Without their nucleus they can't reproduce. So they rely on specialized tissue to make them. It's called marrow

37

What are the four different tissue types?

Connective tissue, epithelial tissue, nervous tissue,
Muscle tissue.

38

What is the function of connective tissue?

Supports and connects different parts of the body. Blood is a connective tissue and so are fat, cartilage, bones, and tendons.

39

What does epithelial tissue do?

Covers the surface of your body and the outside of your organs. It also lines your intestine.

40

Nervous tissue

Makes up the brain and the spinal cord

41

What does the muscle tissue do?

Allow you to move. One type of muscle allows your move your body. Cardiac muscle tissue pumps blood through your heart and smooth muscle moves food along your intestine

42

What types of tissues do plants have?

Photosynthetic/ storages, protective, and transport.

43

What does protective tissue do?

Waterproof layer
Protects plant

44

What does photosynthetic tissue do?

Uses sunlight to produce sugar that the plant uses for energy

45

What does transport tissues do?

Tube like cells with hollow center
Phloem transports food
Xylem transports water

46

What does phloem do?

Transports food

47

What does xylem do?

Transports water