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CELLS
Revision Questions on diffusion
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1.
Give the definition
of diffusion.
Answer:
The natural movement of particles
from an area of high particle
concentration to an area of low
particle concentration.
W. McConnell 2004 Kinross High School
2.
Which of the examples below
show diffusion?
•The smell of air freshener
spreading through a room
This is diffusion
•Air being pumped into a tyre
•Smoke rising upwards in a nonsmoky room
•Leaking gas spreading through the
air in a lab
This is diffusion
•Disappearing vapour trail from a
This is diffusion
jet aircraft
W. McConnell 2004 Kinross High School
3.
List 3 substances which are
able to diffuse into a cell.
?
Answer
•Glucose
•Amino acids
•Oxygen
W. McConnell 2004 Kinross High School
4.
What substances can diffuse
out of a cell.
Answer
•Carbon dioxide
•Water
•Urea
W. McConnell 2004 Kinross High School
5.
Give the definition of
osmosis.
Answer
The movement of water molecules
from an area of high water
molecule concentration to an area
of low water molecule
concentration across a selectively
permeable membrane.
W. McConnell 2004 Kinross High School
6.6.
If plant cells are placed in a 100% water
solution, in what direction will the water
move by osmosis?
100% water
plant
cell
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water moves
into the cell by
osmosis
7. What name is given to describe
a plant cell which is full of water
that has entered by osmosis?
Answer:
Turgid
cell membrane
W. McConnell 2004 Kinross High School
cell wall
8.
What happens to red blood
cells if they are placed in
distilled water?
Answer:
They burst !
W. McConnell 2004 Kinross High School
9.
Why will a plant cell not
burst if it is placed in
distilled water?
Answer:
Because it has a
rigid cell wall.
W. McConnell 2004 Kinross High School
9.
What name is given to describe a
plant cell which has lost a lot of
water by osmosis?
Answer:
Flaccid
vacuole
cell membrane
cell wall
W. McConnell 2004 Kinross High School
10. Describe the appearance of a
potato cell after 30 minutes in
strong sucrose solution.
Answer:
Vacuole is small
Membrane has pulled away
from cell wall.
W. McConnell 2004 Kinross High School
11.
Look at the diagram below. Do the substances
below move into or out of the cell?
oxygen
carbon
dioxide
W. McConnell 2004 Kinross High School
12.
Look at the diagram below.
visking tubing
water
glucose and
starch solution
After 15 minutes, what has happened to the:
They pass out of the visking
• glucose molecules ?
tubing into the water
They remain in the visking
• starch molecules ?
tubing
W. McConnell 2004 Kinross High School
13.
Why did the glucose molecules pass
through the visking tubing?
Glucose molecules are small enough to diffuse through
the membrane.
Why did the starch molecules not pass
through the visking tubing?
Starch molecules are too large to diffuse through the
visking tubing membrane.
W. McConnell 2004 Kinross High School
Multicellular organisms need special
14. organs for diffusion of gases into and
out of their bodies.
Where does this exchange of gases
take place in mammals?
Air sacs of the lungs.
W. McConnell 2004 Kinross High School
15.
The inner wall of the air sac is lined
with a layer of ……………
moisture . This is to
allow the gases to dissolve
………….… and allow
easier diffusion
……………..
W. McConnell 2004 Kinross High School
16.
Gases are exchanged between the cells of
the leaves and the air by diffusion. Name
the structures in the leaf through which
the gases pass.
Answer:
Stomata
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17. To investigate osmosis in plant cells the
experiment below was set up.
A
B
strong salt
solution
water
potato
potato
In which apparatus will the water enter the cell ?
Apparatus B
W. McConnell 2004 Kinross High School
18.
Why did the water enter the potato?
A
B
strong salt
solution
water
potato
potato
In osmosis water moves from a high
concentration (the water) to a low
concentration (in the potato cells).
W. McConnell 2004 Kinross High School
20.
What do we call a membrane
which only allows certain
substances to pass through?
Selectively permeable.
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W. McConnell 2004 Kinross High School