Biology 5090/62 — May/June 2019

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

questions

marks

minutes

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

Q121MMicroscopy and Biological DrawingExperimental ContextsObservations and MeasurementsUse of Techniques, Apparatus and MaterialsAnalysis, Conclusions and EvaluationPlanning Experiments and InvestigationsFree sample

The photograph shows an apple cut in half.

Fig. 1.1

(a)

In the space below make a large drawing of the apple as it appears in the photograph.
Label a seed on your drawing.

(b)

(i)

Draw a straight line between the lines labelled A and B on the photograph. Measure and record the length of your line.

measurement = ______ $\text{mm}$

(ii)

Draw a straight line in a similar position on your drawing. Measure and record the length of your line.

measurement = ______ $\text{mm}$

(iii)

Use your measurements to calculate the magnification of your drawing compared with the apple as it appears in the photograph. Show your working.

magnification $\times$ ______

(c)

A student carried out three tests on the apple, one with iodine solution, one with biuret solution and one with Benedict’s solution, to discover its nutrient content.

(i)

State which test required the use of heat.

______

(ii)

The apple tested positive with Benedict’s solution and negative with both biuret solution and iodine solution. Use this information to complete the table with the student’s observations at the end of the tests.

test solution	observation	conclusion
Benedict’s solution		positive
biuret solution		negative
iodine solution		negative

(iii)

State what these results tell you about the nutrient content of the apple.

______

(d)

(i)

Describe how the student could test the apple for the presence of fat. Include the observation for a positive result.

______

(ii)

State and explain a safety precaution the student must take when carrying out the fat test in (d)(i).

precaution = ______
explanation = ______

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Q2Use of Techniques, Apparatus and Materials · Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation · Planning Experiments and Investigations19M

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