Download Lesson 04 Plant vs. Animal cells Lab Answers

Name ________________________________
Date ______________________
Lab 1.4 Comparing Plant and Animal Cells pages 14-16
What is the Question you should be able to answer by the end of this lab?
Question: ____How do plant cells differ from animal cells?_____________
Hypothesis: If… a microscope is used to view them,___________________
then…___plant cells can be differentiated from animal cells by
their structures.____
Materials: see p. 15. Omit rubber gloves; add prepared slide of Plant Stem Cell.
Procedures: do 1-8, pages 15-16, plus repeat 7 and 8 for the Plant Stem Cell.
Observations:
4. Describe what you see when viewing the onion at medium power, but do not yet draw
it. ____
__Rows of hotdog shaped cells like a brick wall, fish
net stockings.____
5. What effect did the stain have on the cells? Darkened the nucleus, and cell walls
Draw about 4 typical cells in the circle on the back of this sheet. Use the circle to show
the relative size.
5.
Label:
Cytoplasm
Cell Wall
Nucleus
a. Specimen: _______Onion Skin cells________________
b. Magnification of this view: ____400 power_______
c. Field of View at this magnification: ____0.5mm______
d. number of cells seen across the diameter _____2______
e. approximate size of one cell, (c divided by d), 2 div.by 6 = 0.25 mm
8.
Label:
Cytoplasm
Cell Membrane
Nucleus
a. Specimen: ___________Human Epithelial Cells________
b. Magnification of this view: _______400 power____________
c. Field of View at this magnification: ____0.5 mm_____
d. number of cells seen across the diameter ____34_____
e. approximate size of one cell, (c divided by d), ___0.015 mm___,
9.
Label:
Cell Wall
Nucleus, (large red)
C
Chloroplast, (small, died red)
a. Specimen: _______Plant Stem Cell______________
b. Magnification of this view: ____400 power_____________
c. Field of View at this magnification: ___0.5 mm_____________
d. number of cells seen across the diameter ________24_____
e. approximate size of one cell, (c divided by d), __0.021mm__
Analysis:
b. How does staining cells help? _____Makes organelles like the nucleus (and
food vacuoles), and cell walls more obvious.
d. What typical plant cell organelle is missing from the onion cell? _chloroplast__
Explain why the cell would not bother to make this organelle: ___It lives
underground, where there is no light exposure. A chloroplast would be
unnecessary in the dark._______________
Evaluation:
e. If you see just large, dark circles under the microscope, what are you probably looking
at? ___
_air bubbles, (from not lowering the coverslip at an angle).____________
Conclusion:
Give 3 ways that plant cells differ from the human skin cells:
Plant cells tend to be larger,
have cell walls, which give the cell a more regular, box-like shape,
and have corners or points on their edges.
Plant cells found above ground also have chloroplasts.