Osmosis
Q1.
Cells contain a solution of salts and sugars.
A student is investigating how cells change when they are put into water.
(a)     The student:
•        looks at a plant cell using a microscope
•        adds water to the cell.
The plant cell swells up.
Explain why, as fully as you can.
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(3)
(b)     When animal cells are put in water, they swell up, and then burst.
When plant cells are put in water, they swell up, but do not burst.
How does the structure of plant cells prevent them from bursting?
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(1)
(Total 4 marks)