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1.4 Cell Size (calculator recommended)

Total questions: 25

Worksheet time: 50mins

Name
Class
Date
1.

Mandy earns money by delivering groceries. She earned £4 on Monday, £7 on Tuesday, £5 on Wednesday, £4 on Thursday, and £5 on Friday. What is the average amount of money Mandy earned per day?

a)

3

b)

4

c)

5

d)

6

2.

Clayton plays basketball on a team. He has played three games so far. In the first game, he scored 10 points. In the second game, he scored 14 points. In the third game, he scored 6 points. What is Clayton’s average points per game?

a)

10

b)

11

c)

12

d)

13

3.

Jean loves to go bird watching. One day, she saw 7 birds. The next day, she saw 11 birds. The next day, she saw no birds. What is the average number of birds Jean saw each day?

a)

3

b)

4

c)

5

d)

6

4.
A microscope is an instrument that.
a)
makes faraway objects look closer.
b)
makes small objects appear larger.
c)
decreases the size of small objects.
d)
increases the size of small objects.
5.
Which part is the lighted area you see when looking through the eyepiece?
a)
coarse adjustment knob
b)
diaphragm
c)
field-of-view
d)
revolving nosepiece
6.

How many micrometres μm = 1 mm?

a)

1,000

b)

1,000,000

c)

10,000

d)

100,000

7.
Why are microscopes important when studying most cells?
a)
Most cells are very large.
b)
Most cells are very small.  
c)
Most cells move very quickly.
d)
Most cells are dead.  
8.
Find the total magnification: 
Eyepiece = 10X 
Objective lens = 55X  
a)
10x
b)
55x
c)
65x
d)
550x
9.
You should always carry the microscope by the
a)
arm and base
b)
arm and body tube
c)
arm only
d)
the objectives
10.
The field of view is 1450 μm and 8 fungi fruiting bodies are observed across the diameter of your view.  What is the average size of one fungal fruiting bodies?
a)

181 micrometres

b)

11,600 micrometres

c)

.006 micrometres

d)

1.81 micrometres

11.

Here are the settings on a microscope:

Eyepiece Lens: 10X

Low Power  Lens: 15X

High Power  Lens: 50X

You are viewing human blood under low power.  How much bigger do those cells appear to you through the eyepiece. (compared to what they are in real life)

a)
500x
b)
10x
c)
150x
d)
15x
12.

(hard one) Here are the settings on a microscope:

Eyepiece Lens: 10X

High Power  Lens: 40X

F.O.V for 40X = 0.34 mm

You are viewing human blood under high power. You need to calculate the average size of a red blood cell.  You estimate that 51 cells will fit across your F.O.V.  What is the average size of one of those red blood cells?

a)
about 60 μm
b)
About 6 μm
c)
about 2040 μm
d)
about 1μm
13.

You measure the field of view as 4.8 mm.  Calculate what that is in micrometres.

a)

48μm

b)

480μm

c)

4800μm

d)

48000μm

14.

For total magnification you take the magnification of the objective lens and multiply it by the magnification of the eyepiece lens. What magnification does the eyepiece lens normally have?

a)
4x
b)
25x
c)
10x
d)
100x
15.
When looking through a microscope, what name is given to the lighted area that you can see?
a)
circle of light
b)
circle of view
c)
field of view
d)
point of view
16.
If the ocular is 10x and the objective is 4x, what is the total magnification?
a)
14x
b)
6x
c)
40x
d)
2.5x
17.

If the total magnification is 100x and the objective is 10x, what is the eyepiece magnification?

a)
90x
b)
10x
c)
110x
d)
1000x
18.

If the eyepiece magnification is 10x, and the the total magnification is 400x, what is the objective?

a)
40x
b)
410x
c)
4x
d)
4000x
19.

If the eyepiece is 2x and the objective is 4x, what is the total magnification?

a)
8x
b)
6x
c)
2x
d)
80x
20.
Millimeters (mm) are too large a unit at higher magnifications, so biologists use.....
a)

micrometres

b)

centimetres

c)

metres

d)

minimetres

21.
Biologists estimate the size of a specimen at high magnification by......
a)
using a ruler and measuring it
b)
calculating the field of view then counting how many of the specimen would fit across
c)
calculating the total magnification
d)
making a guess based on prior knowledge
22.

How many micrometres (µ) are in a millimetre (mm)?

a)

10 µm

b)

100 µm

c)

1,000 µm

d)

0.1 µm

23.
If each division is 100 µm, what is the size of this organism?
a)
4 µm
b)
400 µm
c)
4,000 µm
d)
400 mm
24.
If you move the slide left while viewing, in which direction will it appear to move?
a)
right 
b)
left
c)
up 
d)
down
25.

This part contains the lens you look through.

a)

nosepiece

b)

eyepiece

c)

low power objective lens

d)

high power objective lens

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