Biology 5090/61 — May/June 2011
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Observations and Measurements · Planning Experiments and Investigations · Microscopy and Biological Drawing
An investigation was carried out to find the effect of different solutions on plant tissue. Some students cut strips of tissue from potato tubers, being careful to ensure that the initial length of each strip was .
They then placed some of these strips in the different solutions. After three hours, the strips were removed, carefully blotted dry and measured.
Measure these potato strips, as shown in Fig. 1.1, and record their final lengths.
had been in per sucrose solution final length = ______
had been in per sucrose solution final length = ______
had been in water final length = ______
Calculate the change in length between the initial length and your measured length.
A = ______
B = ______
C = ______
Describe and explain the changes in length.
Plan an investigation you could carry out, using a different plant tissue, to find the concentration of sucrose solution which would produce no change in mass.
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