Page 80 - Biology Form Two

Biology for Secondary Schools
(a) high water potential
(b) high affinity to water
(c) low water potential
(d) low affinity to water
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Section B
5. Differentiate between the
following, use examples where
necessary.
(a) Osmosis and diffusion
(b) Hypotonic solution and
hypertonic solution
(c) Plasmolysis and haemolysis
(d) Passive transport and active
transport
(e) Osmosis and mass flow
6. Similar types of three animal
cells were placed in 3 different
solutions, namely A, B and C.
After some time, the cell in
solution A bursted, the cell in
solution B shrank and shriveled
and the cell in solution C did not 13. What do you think will happen
change.
(a) Which types of solutions
were A, B and C?
(b) Explain the reasons for such
observations.
7. Explain three factors that affect 14. How does osmosis affect the health
the rate of diffusion.
8. Explain how unicellular organisms
like amoeba avoid bursting as a
result of excessive absorption of
water by osmosis.
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BIOLOGY FORM 2 NEW.indd 74
BIOLOGY FORM 2 NEW.indd 74
9. Describe what would happen to
the rate of oxygen diffusion into
the cell if the thickness of the cell
membrane changes from 15 nm to
20 nm.
10. How does mass flow contribute
to nutrient distribution within the
plants?
11. Consider how plants absorb
nutrients and water from the soil.
(a) How does diffusion help
them get what they need to
survive?
(b) Can you explain this process
in your own words?
12. If you were to create a poster to
teach your classmates about the
importance of diffusion in living
things, what key points would you
include? What examples would
you use to illustrate your ideas?
to the red blood cells and the
cucumber cells when placed in
plain water? Why do you think
they react differently? What
process is at work here?
of plant cells? What might happen
to a plant if it is watered with
saltwater instead of fresh water?
15. If you were to design an experiment
to show the effects of osmosis on
Student’s Book - Form Two
05/10/2024 15:36:27
05/10/2024 15:36:27