y9 microscope-cells revision

Question 1

Whats the function of a microscope?

Answer 1

To magnify small objects

Question 2

What does a light microscope use to magnify specimens?

Answer 2

Light.

Question 3

What does a electron microscope use to magnify specimens?

Answer 3

electrons pass through the specimen

Question 4

where/apperance is the stage and what does it do?

Answer 4

its the square thing that holds the specimen

Question 5

where/apperance is the arm and what does it do?

Answer 5

the long thing which holds it all together.

Question 5

where/apperance is the eyepeice lens and what does it do?

Answer 5

what u look into and it magnfies the specimen

Question 6

Where is the diaphragm and function

Answer 6

under stage. adjusts light intensity when turned

Question 7

a.what is the glass called that the specimin sits on?
b. what do liquid do you put ontop of the specimin?
c. what do you put ontop (square)?

Answer 7

slide.
stain.
coverslip.

Question 8

what is magnification. fully accurate.

Answer 8

How many times bigger an image is compared to the object.

Question 9

what is resolving power?

Answer 9

The ability to distinguish between two points on a object.

Question 10

In which microscope do specimin have to be DEAD

Answer 10

electron

Question 10

3. Disadvantages of light microscope.

Answer 10

1&2. magnification AND resolution power is not high enough to produce a image with great enough detail and intricate cell sctructure.

3. Limited contrast can make it hard to see different parts of a specimen without a stain.

Question 11

whats the difference between coarse focus and fine focus

Answer 11

Coarse Focus: Moves the stage up and down quickly for initial focusing.

Fine Focus: Makes small adjustments for precise clarity after using coarse focus.

Question 12

which objective lens is used first,

Answer 12

1. 4x (red) depending

2.10x (yellow) depending

3. 40x (blue) depending

Question 13

how many mm in cm

Answer 13

10

Question 14

you divide by 1000 each times when going from…

Answer 14

(nm)nanometre to
(µm)micrometre to
(mm)millimetre to
(m)metre

Question 15

you times by 1000 each times when going from…

Answer 15

(m)metre to
(mm)millimetre to
(µm)micrometre to
(nm)nanometre

Question 16

how to find image, size of object or image size?

Answer 16

use I / AxM

Question 17

how to turn mm into cm?

Answer 17

x10

Question 18

how to turn mm into m

Answer 18

divide 1000

Question 19

how to turn mm into nm

Answer 19

x1000
x1000

Question 20

how to turn cm into µm

Answer 20

x10 = mm
x1000 = µm

Question 21

how to turn nm into m

Answer 21

divide 1000
divide 1000
divide 1000

Question 22

how to find magnification. (not i am)

Answer 22

eyepeice lens x objective lens

Question 23

step 1 for onion skin required practical

Answer 23

collect a sample of the cell you want to observe

Question 24

step 2 for onion skin required practical

Answer 24

Remove the inner skin of a layer of onion using forceps.

Question 25

step 3 for onion skin required practical

Answer 25

Place the thin slice onto a clean glass slide. Use your forceps to keep the onion skin flat on the glass slide.

Question 25

step 4 for onion skin required practical

Answer 25

Using a pipette, add one or two drops of dilute iodine solution on top

Question 26

step 5 for onion skin required practical

Answer 26

Hold the coverslip by its side and lay one edge of the cover slip onto the microscope slide

Question 27

step 6 for onion skin required practical

Answer 27

6. Lower the cover slip slowly so that the liquid spreads out. (using the mounted needle)

Question 28

how many organells are there (i shld know)

Answer 28

8.

Question 29

what type of cell has 5 of the organells

Answer 29

animal

Question 30

function of cell membrane

Answer 30

Controls the movement of substances in and out of the cell.

Question 31

function of the nucelus

Answer 31

Contains DNA and controls the activities of the cell.

Question 32

whats the function of cytoplasm

Answer 32

jelly like substance
Where chemical reactions take place.

Question 33

whats the function of mitochondria

Answer 33

where respiration takes place

Question 34

whats the function of ribosomes

Answer 34

where protein-synthesis takes place

Question 35

whats the function of cell wall

Answer 35

Made of cellulose, this supports the cell.

Question 36

whats the function of chloroplasts

Answer 36

Contain chlorophyll, which absorbs light for photosynthesis.

Question 37

whats the function of permanent vacuole

Answer 37

Filled with cell sap, helping to keep the cell rigid.