December 21, 2015 – December 23, 2015
Unit 5: Homeostasis and Cell Transport
Honors Biology
Monkemeier
NAME _____________________________________
DATE _________________________
Checking for Understanding
a. Movement of a substance
1. _____ permeable
from an area of higher
concentration to an area of
lower concentration.
2. _____ selectively permeable
b. The membrane allows
substance to pass through
c. Movement of water from an
3. _____ impermeable
area of higher concentration
to an area of lower
concentration.
d. Greater concentration of
4. _____ diffusion
dissolved substances than
water.
e. The membrane does not
5. _____ osmosis
allow substance to pass
through.
f. Lesser concentration of
6. _____ hypertonic
dissolved substances than
water.
g. Describes cell membrane
7. _____ hypotonic
Honors Biology
Monkemeier
December 21, 2015 – December 23, 2015
Unit 5: Homeostasis and Cell Transport
Define the following terms in your own words. Do not copy the definition from a resource or
internet source.
1. Concentration Gradient:_____________________________________________________
____________________________________________________________________________
2. Passive Transport:____________________________________________________________
_______________________________________________________________________________
3. Isotonic:____________________________________________________________________
______________________________________________________________________________
4. Why does the cell membrane need to be permeable to substances used as nutrients?
5. Why do you think oxygen and carbon dioxide can easily diffuse across the cell membrane?
6. Examine the diagrams of plant cell and animal cells below. The words hypotonic and
hypertonic must be used together to describe the cell and its environment. The words above
each cell describe the extracellular fluid (environment).
a. Draw an arrow to the inside of each cell and label it with the correct description: isotonic,
hypertonic, hypotonic.
b. Label the animal cells correctly using the words: lysis and crenated.
Honors Biology
Monkemeier
December 21, 2015 – December 23, 2015
Unit 5: Homeostasis and Cell Transport
Sources for Images
https://internalandexternalenvironments2012.wikispaces.com/Hypertonic,+hypotonic+and+isotonic+effects+on+
plants+and+animal+cells.
http://microscopy4kids.org/Osmosis
ACTIVITY – VIEWING PLANT CELLS
Observing Elodea/ Water Plants (Turgor Pressure, Plasmolysis)
Materials:
Microscope
Microscope Slide/ coverslip
Leaf from water plant (elodea) in a fresh water environment
Eye dropper with tap water
Leaf from a fresh water plant (Elodea)placed in a salt water environment
Procedure:
1. Create a wet mount slide of a leaf from the water plant in a fresh water environment.
2. Use the scanning objective lens to find the leaf, center it and to focus.
3. Switch to low power objective. View the cell wall and locate the large central vacuole and
chloroplasts. Create a labeled sketch of the field of view. PAY ATTENTION to the SIZE of the
Large Central Vacuole.
4. Using the field of view measurement to be about 1.5 microns, estimate the size a cell from
this plant.
5. Switch to high power objective. View the cell wall, locate the large central vacuole and
chloroplasts. Create a labeled sketch of the field of view.
6. Repeat steps 1 through 5 with a leaf from the same plant but from the salt water environment.
PAY ATTENTION to the SIZE of the Large central vacuole.
I.
DATA – use the space below for your labeled drawings and for your calculations for
estimating the size of a plant cell.
Honors Biology
2015
Monkemeier
December 21, 2015 – December 23,
Unit 5: Homeostasis and Cell Transport