(a) (i) Define the term osmosis - Leaving Cert Biology - Question 8 - 2009
Question 8
(a) (i) Define the term osmosis.
Osmosis is the movement of water through a semi-permeable membrane from an area of lower solute concentration to an area of higher ... show full transcript
Worked Solution & Example Answer:(a) (i) Define the term osmosis - Leaving Cert Biology - Question 8 - 2009
Step 1
Define the term osmosis.
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Answer
Osmosis is the movement of water through a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Step 2
Give an example of osmosis in plants.
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Answer
An example of osmosis in plants is when roots absorb water from the soil, where the concentration of solutes in the soil is lower than that in the root cells.
Step 3
In the space below draw a labelled diagram of the apparatus you used in the investigation.
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Answer
A diagram should include a setup with two solutions separated by a semi-permeable membrane, labeled accordingly.
Step 4
Describe how you used this apparatus to carry out the investigation.
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Answer
The apparatus was used to set up an experiment comparing two solutions. I observed the movements of water across the semi-permeable membrane, checking for changes over time.
Step 5
State the result(s) of your investigation.
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The results indicated that the solution became heavier after water absorption, demonstrating osmosis.
Step 6
Briefly explain the result(s) you have given in part (iii).
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The increase in mass shows that water moved into the solution, confirming the direction of water movement from areas of lower solute concentration to higher solute concentration.
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