Download The Cell and the Microscope.

THE CELL AND THE
MICROSCOPE.
 Chapter
 23/11/12
2.
RECAP!!
RECAP!!


How did you set up the investigation to observe
an animal cell.
What did you see when you looked under the
microscope.

How do draw an animal cell.

What labels do you put on the diagram.
Eyepiece lens
Coarse focus
barrel
Fine focus
Objective lens
slide
stage
Iris diaphragm
BY THE END OF THIS CLASS:
You will be able to:
 Set up an investigation to observe a plant cell.




Identify a plant cell under magnification.
From your observations draw and label a
diagram of a plant cell.
List the functions of the cell.
LAB SAFETY!!
Sitting in seats; bags out of way of walkway.
 In lab NO drinking or eating in the labs.
 Wear goggles.
 If anyone breaks glass inform teacher
immediately!

EQUIPMENT NEEDED:

Per Pair:
Microscope slide.
 Dropper.
 Cover slide
 Tissue Paper.
 Microscope.


Iodine for plant cells.
METHOD:


Step 1: Get an onion, with a forceps peel a thin
inside layer from the onion.
Step 2: Place the slice of onion on the slide
carefully. Make sure it doesn't
fold on top of itself.
(Needs to be flat)
METHOD:

Step 3: With the dropper place one drop of water
on the plant cells.


Step 4: With your tissue paper gently place it to
the side of the plant cells to absorb the extra
water.
METHOD:


Step 5:Place one drop of iodine directly on to the
plant cells.
Step 6: Putting on the cover slide:

Starting at one edge, gently lower a cover slip over
the onion skin
METHOD:
Step 7: Place the slide on the stage under low
power(X4). Use the coarse adjustment knob to
focus
 Step 8: Rotate the nosepiece to medium power
(X10). Use the fine adjustment knob to focus.
Observe what you see.

TIDY UP!!
DRAW WHAT YOU SEE:

Under the different magnifications: and
draw what you see (use a pencil!!)
PLANT CELLS

Image was at X400 magnification.
PLANT CELLS LABELLED:
WRITE UP!!! INTO YOUR EXPERIMENT
BOOK!!
Under these headings!!
 Title: To examine plant cells under a
microscope
 Equipment
 Method (How did you set up the experiment)
 Diagrams
 Result (Q. At what magnification was there a
clearer image)
 Conclusion (What could you see?)

FUNCTIONS OF THE PART OF THE
CELL!!

Cell Membrane: controls what enters and
leaves the cell.
FUNCTIONS:

Nucleus: is the control centre of the cell, it
contains our genes(DNA).
FUNCTIONS:

Cytoplasm: is a watery fluid found between the
nucleus and the cell membrane.
TYPICAL PLANT CELL
FUNCTION


Cell Wall: Only plant cells have a cell wall.
The Cell Wall is made of a firm substance that
gives shape and support to the cell.
RECAP!!


How did you set up an investigation to observe a
plant cell?
What did you see when you put the slide under
magnification?

What labels did we put on your diagram?

List the functions of the parts of the plant cell?
HOMEWORK!!