Biology 5090/61 — May/June 2010

Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme

questions

marks

minutes

Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Microscopy and Biological Drawing · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations · Observations and Measurements

Q117MExperimental ContextsAnalysis, Conclusions and EvaluationUse of Techniques, Apparatus and MaterialsPlanning Experiments and InvestigationsFree sample

Fruits of banana, Musa spp., change as they ripen.

Fig. 1.1

(a)

Describe the differences that you can see between the unripe banana fruit A, and the ripe fruit B, shown in Fig. 1.1.

______

(b)

Table 1.1 shows the mass of a banana fruit measured over a period of three weeks.

Table 1.1

day	mass / $\text{g}$
1	152
4	146
6	140
7	138
10	126
12	122
15	114
18	108
21	98

(i)

Construct a graph of these results on the grid provided.

grid

(ii)

Calculate the loss in mass of the banana fruit during the three weeks.

______

(iii)

Suggest an explanation for the loss in mass during the ripening of the fruit.

______

(c)

One of the changes that takes place as a banana fruit ripens is the breakdown of starch to sugar.

(i)

Describe how you could carry out a test for reducing sugar on a piece of banana fruit.

______

(ii)

Explain how would you use this test to show that the reducing sugar content increases during ripening.

______

The rest of this paper

2 more questions

Q2Microscopy and Biological Drawing · Experimental Contexts · Analysis, Conclusions and Evaluation · Observations and Measurements16M
Q3Microscopy and Biological Drawing · Experimental Contexts7M

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