Transcript Plant Cell - MSPnet Hub

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Plants, Animal and Bacteria cells
Indicator - KCKS10SC060302: Distinguish
cellular structures and their function in plants,
animals and bacteria. (▲3.1.2, 302, ACT )
Focused indicators - ( Content Objectives)
a. Summarize the structure and function of cell
organelles that perform the tasks that are
needed for the cell’s survival
b. Compare and contrast the organelles found in
plant, animal and bacteria cells.
Focus Questions
a.
Summarize the structure and function of plant,
animal and bacteria cells?
What task do cell organelles need to perform
for the cell’s survival?
b. How do organelles found in plant, animal, and
bacteria differ?
How are organelles found in plant, animal and
bacteria the same?
Engaging Students in
Cell Observation
Materials needed Microscope
Slides and slid covers
Onion membrane
Cheek cells
Bacteria cells - Yogurt (active
culture)grocery store
Tooth pick to scrape inside of cheek for
cells
Methylene Blue
Investigation 1 - Engaging Onion Cells
•
What Are the Parts of the Onion Skin
Cell?
Onion Part
Function
Looks like
Smells like
Prepare a wet Onion Slide
A.
You will be given a piece of onion by your teacher.
B.
Remove the transparent membrane from the inner
surface.
C.
Place a flat piece of this membrane on a glass slide.
D.
Cover the membrane with a drop of water and a cover glass.
E.
Before to keep the membrane from folding or wrinkling.
F.
Throw the left over pieces of onion in the trash.
G.
Observe slide with both lower and high power magnification.
Onion Cell Lab Observation Sheet
Name ______________ Date______________
Questions and Observations:
1. Is the skin composed of one or many cells?
2. What is the general shape of these cells?
Make a sketch of your onion membrane from the highest
power of magnification and label the parts below.
Observation 1
Observation 2
Power _______
Power ________
Sketch here
Sketch here
What do your onion skin tell you?
4. Estimate the length in microns of the cells, as seen under high power.
a) Count the number of cells, laid end to end necessary to cross
the diameter of the field.
b) Divide the number of cells into the known field of diameter.
5.
Do the cells have a cell wall?
Explaining Plant Wall
• c.) Remove the cover slip, add a drop of methylene blue
stain, and replace the cover glass on the membrane.
•
d.)Observe the slide under both low and high power
magnification,
6. Can you still see the double outer layer, that is, the
cell wall?
Explaining Plant Cell Nucleus
7. Why was the stain added?
8. Can you see a dark, round structure inside the cell?
Do all the cells have the dark, round structure?
This structure is the control center of the cell called the nucleus.
Explaining Plant Cell Cytoplasm
1 0. Can you see a lightly-stained, granular area within the cells? This
area is called the cytoplasm.
11. Draw a few cells of the stained onion skin as seen under both low and
high power. Label structures.
Stained onion skin cells
Stained onion skin cells
______________X power(high)
_____________X power( low)
Plant Cell
Plant Cell Structure
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Comparing and
Contrasting Cells
• http://www.cellsalive.com/cells/cell_mod
el.htm
•
Compare and Contrast Plant, Animal
and Bacteria Cell.
http://www.wiley.com/legacy/college/boy
er/047003790/animations/cell_structure/
cell_structure.htm
1. Vocabulary
2. Build a Cell
3. Assessment
Onion Observation Lab Sheet Printable
Observation 1
Observation 2
Power _____________
Power ______________
Sketch
Sketch