Download Cells and the Microscope

Cells and the Microscope
1. State Who:
a) the first people to invent the microscope included Robert Hooke and Anton Van
Leeuwenhoek.
b) The person who invented the microscope similar to the one we use today was Robert
Hooke.
c)The Scientist Robert Hooke discovered the cell theory.
d)Theodor Schwean thought that cells were not just there but were produced.
2.State who saw the first:
a) Robert hooke was the first to see cells
b) Anton Van Leeuwenhoek saw the first animal cell.
c) Anton Van Leeuwenhoek discovered bacteria
d) Robert Brown discovered the cell nucleus
e) Rudolph Kolliker was the first to discover the cell mitochondria.
3. List the three main points of the cell theory.
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All living things are made of cells
New cells are created when other cells divide in two
All cells are similar to each other, but are not identical
4. State another name for the eyepiece.
Another name for the eyepiece on a microscope is ocular lens.
5. State what SEM and TEM stand for.
TEM stands for Transmission electron microscope and SEM stands for Scanning Electron
Microscope.
6. Explain why Cells were not known about before the invention of the microscope.
Cells were not known about because in order to see a sell you need a microscope as Cells are
tiny and are to small for humans to see with the naked eye.
7. Explain why Hooke named the ‘boxes’ he saw in cork ‘cells’.
Hooke called them ‘Cells’ because they looked like the Cells in which the monks of the time lived
in.
8. Define the following terms.
a) Microscopic­ So small only to be visible by microscope.
b)Specimen­ an individual animal, plant, peice of mineral, etc.
c)Image­ a representation of the external source of something.
d)Field of view­ The area in which you can see something.
9. Use one word to describe a cell
Miniscule
10. Explain what magnification of ×10 means in terms of Specimen and image
The term 10 times means how much you have zoomed onto the specimen and the image gets
refined.
11.The objective lens should never be moved downwards while looking through the
eyepiece. Propose a reason why.
I believe the Objective lens should never be moved downwards while looking through it because
when the lamp shines up you could get blind because the lens is magnified at the light. Another
reason is that it is not an effective way of focusing on your specimen/subject.
12. Identify The parts of the compound microscope
a) Eyepiece
b) Objective lens
c) Stage
d) Lamp
e) Base
f) Arm
g) Coarse focusing knob
h) Fine Focusing knob
13. Copy the table below and calculate the missing values. Answer are in black.
Eyepiece Magnification
Objective lens magnification
Total magnification
x10
x10
x100
x5
x100
x500
x20
x40
x800
x3
x100
x300
x30
x20
x600