Question
In an investigation, a student extracted three pieces of pawpaw cylinders using a cork borer.The cylinders were cut back top 50mm length and placed in a beaker containing a solution.The results after 40 minutes were as shown in the table below.
(a) Account for the results in the table above
(b) What would be a suitable control set up for the investigation?
| Feature | Result |
|---|---|
| Average length of cylinders(mm) | 56mm |
| Stiffness of cylinders | Stiff |
(a) Account for the results in the table above
(b) What would be a suitable control set up for the investigation?
Answer
(a) The cylinders were placed in a hypotonic solution ie. Low solute concentration than that of cell sap. The cells absorbed water by osmosis until they become turgid. Thus increase in cell size and firmness.
(b) Placing the cylinders in a juice extract of the pawpaw fruit/isotonic solution.
(b) Placing the cylinders in a juice extract of the pawpaw fruit/isotonic solution.
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