2. Diffusion
Define the term ‘diffusion’.
Draw an arrow on each diagram to show
the movement of particles by diffusion.
Name a
gas that
is
diffused
out of
cells.
Name a
gas that
is
diffused
into cells.
Which
waste
product
is
diffused
out of
cells into
the blood
plasma to
be
excreted
by the
kidneys?
Describe how surface area affects
the rate of diffusion.
Describe how temperature affects
the rate of diffusion.
Describe how concentration the
rate of diffusion.
A euglena cell has
a relatively large
surface are to
volume ratio.
Describe how this
affects the rate
of diffusion for
the euglena cell.
Calculate the surface area for each
of these shapes:
Calculate the volume of for the following shapes:
Calculate the surface area : volume ratio for each of the
following shapes:
10cm
7cm
12cm
3cm
12cm
6cm
5cm
5cm
5cm
4cm
7cm
4cm
8cm
11cm
2cm
15cm
6cm
6cm
5cm
8cm
10cm
7cm
Describe how human lungs are adapted
for efficient gaseous exchange.
Describe how fish gills are adapted for
efficient gaseous exchange.
Describe how plant roots and leaves are adapted for
efficient gaseous exchange.
Which features allow efficient gaseous exchange
for most organisms?
3. Osmosis
Define the term ‘osmosis’.
Where in
humans does
osmosis take
place. Provide
specific
examples.
Where in
plants does
osmosis take
place. Provide
specific
examples.
Draw an arrow on each diagram
to show the movement of water.
Outline what a partially
permeable membrane is.
A cell is placed in pure water.
Describe the movement of
water in this example.
Active Transport
Explain why we must calculate the %
change?
Concentration of
salt solution in
mol dm-3
Starting mass in
g
Final mass in
g
Change in mass in
g
Percentage
(%) change
0.0 1.20 1.50 0.30 25%
0.2 1.31 1.49
0.4 1.29 1.34
0.6 1.30 1.29
0.8 1.19 1.02
Calculate the figures that are missing
from the table.
What is the equation to calculate %
change?
Define the term ‘active
transport’.
How does an organism
release energy for active
transport?
Where does active
transport occur in humans?
Use following numbers to
fill out the Venn diagram
for the three different
processes:
1. Involved water only
2. Requires Energy
3. It’s passive
4. Movement of particles
5. Needs a semi-
permeable membrane
6. High to low
concentration
7. Against a
concentration gradient
8. Occurs in nature
9. How minerals get into
a root hair cell.
10. How oxygen leaves a
leaf
11. How water keeps a
plant cell turgid
12. Involved transport of
solutes.
Active Transport
