Biology 5090/62 — October/November 2014

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

questions

marks

minutes

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

Q123MObservations and MeasurementsExperimental ContextsAnalysis, Conclusions and EvaluationPlanning Experiments and InvestigationsFree sample

Some students carried out an investigation to find the effect of the shape of an animal's body on heat loss from the body. Heat loss was measured as a decrease in temperature in $^\circ\text{C}$ .

They used two plastic containers, A and B, to represent two differently shaped bodies of an equal volume.

The containers used are shown in Fig. 1.1.

Fig. 1.1

The two containers, A and B, were each filled with $100\text{ cm}^3$ of hot water. A thermometer was used to measure the temperature of the hot water in each container immediately. These temperatures were recorded at 0 minutes.

Temperatures were then recorded for each container every two minutes, for a total of eight minutes.

Table 1.1 is an incomplete results table from this investigation.

(a)

Complete Table 1.1.

Table 1.1

(b)

Calculate and record the overall decrease in temperature of the water for each container and record these two values below.

Show your working.

A ______ $^\circ\text{C}$
B ______ $^\circ\text{C}$

(c)

(i)

Construct a graph to show the decrease in temperature of the water with time, in containers A and B, using the results in Table 1.1. Use the same axes for both sets of data.

Fig. 1.3

(ii)

Describe these results.

______

(iii)

The shape of a container does affect the heat loss from the container.

Suggest an explanation for this.

______

(d)

State three factors that were kept constant in this investigation.

______
______
______

(e)

Suggest and explain two possible improvements to the method used in this investigation.

improvement 1 = ______
explanation = ______
improvement 2 = ______
explanation = ______

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2 more questions

Q2Observations and Measurements · Analysis, Conclusions and Evaluation · Microscopy and Biological Drawing · Experimental Contexts13M
Q3Experimental Contexts · Use of Techniques, Apparatus and Materials4M

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