The banana is the fruit of a banana plant. As the fruit gets older, it ripens and becomes easy to eat. You are provided with a piece of a ripe banana. - Cut a $1\,\text{cm}$ wide cross-section from the middle to give a circular piece of banana. (i) Make a large drawing of one of the cut surfaces of the banana. (ii) Draw a straight line across the largest diameter of your drawing. Measure this line and record the measurement. \_\_\_\_\_\_ $\text{mm}$ Measure the largest…

Biology 5090/31 — October/November 2018

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

questions

marks

minutes

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

Q117MMicroscopy and Biological DrawingExperimental ContextsObservations and MeasurementsAnalysis, Conclusions and EvaluationUse of Techniques, Apparatus and MaterialsFree sample

The banana is the fruit of a banana plant. As the fruit gets older, it ripens and becomes easy to eat. You are provided with a piece of a ripe banana.

Cut a $1\,\text{cm}$ wide cross-section from the middle to give a circular piece of banana.

(a)

(i)

Make a large drawing of one of the cut surfaces of the banana.

(ii)

Draw a straight line across the largest diameter of your drawing. Measure this line and record the measurement.

______ $\text{mm}$

Measure the largest diameter on the cut surface of your banana and record the measurement.

______ $\text{mm}$

Calculate the magnification of your drawing. Show your working.

magnification $\times$ ______

(b)

Cut another thin slice from the banana to expose a fresh cross-section.
Lay this banana section flat, with the freshly cut surface facing upwards.
Completely cover the cut surface with iodine solution and leave this for five minutes.
After five minutes, pick up the banana section with forceps. Use water to carefully rinse excess iodine solution into the empty container labelled waste water.

(i)

Describe your observations of the result of this test.

______

(ii)

State what you can conclude from your observations.

______

(c)

(i)

Describe how you would test the inner part of another slice of banana to see if it contains reducing sugar.

______

(ii)

Carry out this test on a fresh sample of the inner part of the banana. If you require hot water for a water-bath, raise your hand to request it when needed. Caution: water will be hot.

State the result of the test and the conclusion you can make.

______

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2 more questions

Q2Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation · Planning Experiments and Investigations · Microscopy and Biological Drawing15M
Q3Experimental Contexts · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations8M

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