Biology Lab Practical 2 Quizzes & Answers With
Complete Solutions Graded A+
QUESTIONS AND ANSWERS
What is diffusion?. ANSWER -The tendency of molecules to move from where they
are highly concentrated to where they are less concentrated
How is diffusion different from osmosis?. ANSWER -Osmosis is the diffusion of
water
What does it mean to say that two solutions are isotonic?. ANSWER -It means that
two solutions have the same concentrations of water and solutes. A cell will not gain
or lose water if placed in this type of solution, it is in equilibrium.
What happens to a cell in a hypotonic solution?. ANSWER -The cell will gain water.
The solution contains more water (and therefore fewer solutes) than the other
solution.
Under what conditions is a plant cell turgid?. ANSWER -Its vacuole contains the
maximum amount of water
turgid=swollen
Under what conditions is a red blood cell hemolyzed?. ANSWER -A red blood cell is
hemolyzed when it is in a hyperytonic solution, which means the water is sucked out
of the cells
What was the purpose of Lab #8 The Movement of Molecules?. ANSWER -
,In Lab #8 The Movement of Molecules:
How should the baggies and potato strips, after the experiments have been completed,
be disposed of?. ANSWER -They go in the trash can
Diffusion is the movement of a substance from ___________ concentration to
___________ concentration.. ANSWER -where it is at a high concentration to where
it is at a low concentration.
Is diffusion an example of passive or active transport? Explain your answer..
ANSWER -Diffusion is an example of passive transport because it does not require
energy to function
In the diffusion experiment, what did the baggie represent?. ANSWER -A semi-
permeabale membrane
For red blood cells, which solution is:
a. isotonic _________________________
b. hypertonic ______________________
c. hypotonic _______________________. ANSWER -a. isotonic= 0.9% NaCl
b. *hypertonic* = 10% NaCl
-cloudy solution
-Water is sucked out of blood cell
-Text *cannot* be seen through it
c. *hypotonic*= DI Water
,-clear solution
-Water is put in to blood until it bursts
-Text *can* be seen through it
When plant cells are turgid, will the plant be standing upright or wilted? Why?.
ANSWER -The plant will be standing upright because of *turgor pressure*=the
chloroplasts and cytoplasm are pushed up against the cell wall, and the cell wall
becomes rigid
You are slicing potatoes that you will fry later. You want your french fries to be moist
on the inside. Should you soak them in salt water or unsalted water? Why?.
ANSWER -Soak them in salt water (NaCl) because it is a hypertonic solution= (water
leaves the central vacuole)
Is the net movement of substance from:
low concentration to high concentration
OR
high concentration to low concentration?. ANSWER -high concentration to low
concentration
What moved through the baggie: starch or iodine?. ANSWER -iodine
What process caused the movement through the baggie?. ANSWER -diffusion
How did you know the substance had moved through the baggie?. ANSWER -The
color changed to blue/black
, *Experimental set-up*: starch in the beaker, iodine in the baggie. After 30 minutes:
What substance or substances would be in the beaker? baggie? How would you
know?. ANSWER -Beaker= *Iodine*
Baggie= *Starch*
Beaker will be black/blue, baggie will be clear/cloudy white
*Experimental set-up*: iodine in beaker, starch in the baggie. After 30 minutes:
What substance or substances would be in the beaker? baggie? How would you
know?. ANSWER -Beaker= *Starch*
Baggie= *Iodine*
Beaker wil be cloudy/clear white, baggie will be blue/black
Name the two substances in a 10% NaCl solution. ANSWER -Salt and Water
In a 10% NaCl solution, which substance is the solute?. ANSWER -Salt
In a 10% NaCl solution, which substance is the solvent?. ANSWER -Water
How do potato slices feel if the cells have been soaked in distilled water?. ANSWER -
Stiff, hard because all the cells have been stuffed with the highest capacity of water.
Complete Solutions Graded A+
QUESTIONS AND ANSWERS
What is diffusion?. ANSWER -The tendency of molecules to move from where they
are highly concentrated to where they are less concentrated
How is diffusion different from osmosis?. ANSWER -Osmosis is the diffusion of
water
What does it mean to say that two solutions are isotonic?. ANSWER -It means that
two solutions have the same concentrations of water and solutes. A cell will not gain
or lose water if placed in this type of solution, it is in equilibrium.
What happens to a cell in a hypotonic solution?. ANSWER -The cell will gain water.
The solution contains more water (and therefore fewer solutes) than the other
solution.
Under what conditions is a plant cell turgid?. ANSWER -Its vacuole contains the
maximum amount of water
turgid=swollen
Under what conditions is a red blood cell hemolyzed?. ANSWER -A red blood cell is
hemolyzed when it is in a hyperytonic solution, which means the water is sucked out
of the cells
What was the purpose of Lab #8 The Movement of Molecules?. ANSWER -
,In Lab #8 The Movement of Molecules:
How should the baggies and potato strips, after the experiments have been completed,
be disposed of?. ANSWER -They go in the trash can
Diffusion is the movement of a substance from ___________ concentration to
___________ concentration.. ANSWER -where it is at a high concentration to where
it is at a low concentration.
Is diffusion an example of passive or active transport? Explain your answer..
ANSWER -Diffusion is an example of passive transport because it does not require
energy to function
In the diffusion experiment, what did the baggie represent?. ANSWER -A semi-
permeabale membrane
For red blood cells, which solution is:
a. isotonic _________________________
b. hypertonic ______________________
c. hypotonic _______________________. ANSWER -a. isotonic= 0.9% NaCl
b. *hypertonic* = 10% NaCl
-cloudy solution
-Water is sucked out of blood cell
-Text *cannot* be seen through it
c. *hypotonic*= DI Water
,-clear solution
-Water is put in to blood until it bursts
-Text *can* be seen through it
When plant cells are turgid, will the plant be standing upright or wilted? Why?.
ANSWER -The plant will be standing upright because of *turgor pressure*=the
chloroplasts and cytoplasm are pushed up against the cell wall, and the cell wall
becomes rigid
You are slicing potatoes that you will fry later. You want your french fries to be moist
on the inside. Should you soak them in salt water or unsalted water? Why?.
ANSWER -Soak them in salt water (NaCl) because it is a hypertonic solution= (water
leaves the central vacuole)
Is the net movement of substance from:
low concentration to high concentration
OR
high concentration to low concentration?. ANSWER -high concentration to low
concentration
What moved through the baggie: starch or iodine?. ANSWER -iodine
What process caused the movement through the baggie?. ANSWER -diffusion
How did you know the substance had moved through the baggie?. ANSWER -The
color changed to blue/black
, *Experimental set-up*: starch in the beaker, iodine in the baggie. After 30 minutes:
What substance or substances would be in the beaker? baggie? How would you
know?. ANSWER -Beaker= *Iodine*
Baggie= *Starch*
Beaker will be black/blue, baggie will be clear/cloudy white
*Experimental set-up*: iodine in beaker, starch in the baggie. After 30 minutes:
What substance or substances would be in the beaker? baggie? How would you
know?. ANSWER -Beaker= *Starch*
Baggie= *Iodine*
Beaker wil be cloudy/clear white, baggie will be blue/black
Name the two substances in a 10% NaCl solution. ANSWER -Salt and Water
In a 10% NaCl solution, which substance is the solute?. ANSWER -Salt
In a 10% NaCl solution, which substance is the solvent?. ANSWER -Water
How do potato slices feel if the cells have been soaked in distilled water?. ANSWER -
Stiff, hard because all the cells have been stuffed with the highest capacity of water.
