Year 11 Biology –Patterns in Nature
Practical Dot points –Section 2
Plan, choose equipment or resources (1) and perform a first-hand investigation (2) to gather information (3)
and use available evidence to identify the following substances in tissues (4):
- Glucose
- Lipids
- Chloride ions
- Starch
- Proteins
- Lignin
1. What equipment/resources did you use?
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2. What did you do (outline the method)?
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3. What information did you collect (results)?
Substance
Result for
Result for
Result for
Result for
Result for
Result for
Tested
glucose
starch
lipids
proteins
chloride
lignin
ions
4. What does this mean (which of the substances did you identify and in what tissues/cells)?
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Perform a first-hand investigation (1) to demonstrate the difference between osmosis and diffusion (2)
Describe what you did and how it demonstrated diffusion and osmosis
Describe set up (1)
Describe results (1)
What it represents (2)
Dialysis tubing containing
Starch solution inside
Molecules of the water (containing dissolved
starch solution, securely
tubing appears purple.
iodine) moved through the semi-permeable
tied. Tubing is placed inside
Iodine solution in beaker
membrane into the starch solution and
a beaker containing iodine
shows no colour change but
caused a colour change. This is osmosis.
solution.
slightly lower volume.
Perform a first-hand investigation (1) to demonstrate the effect (4) of surface area to volume ratio (2) on
rate of diffusion (3)
1.
2.
3.
4.
What did you do (method)?
Surface area to volume ratio is the INDEPENDENT VARIABLE (that you change on purpose)
Rate of diffusion is the DEPENDENT VARIABLE (that you watch and measure).
Use your results to explain the relationship between the two variables.