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In an investigation a student extracted three pairs of pawpaw cylinders using a cork borer. The cylinders were cut back to 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?

Answer Text:
a)- The cylinder increased in length and felt hard or stiff or firm because they were placed in hypotonic solution compared to cytoplasm of pawpaw cell, the cell gained water by osmosis, become turgid hence tissue become firm and the cylinder increase in size.
b)-Use boiled pawpaw cylinder. Since the are
dead, they will not gain water by osmosis.