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INFORMATION FOR CANDIDATES

1. This question paper consists of two questions. Answer all questions.

2. Write your answers or Question I in the spaces provided in the question paper.

3. Write your answers or Question 2 on the lined pages at the end of the questionpaper in detail. You may use equations, diagramg tables, graphs and othersuitable methods to explain your answer.

4. Show your working, it may help you to get marks.

5. If you wish to cancel any answer, neatly cross out the answer.

6. The diagrams in the questions are not drawn to scale unless stated.

7. Marks allocatedfor each question or part question are shown in brackets.

8. The time suggested to complere Question 1 is 45 rninutes and Question 2 is45 minutes.

9. You may use a non-progr&mmable scientific calculator.

10. Hand in this question paper at the end of the examination.

Marks awarded:

Score Description

3 Excellent: The best response

2 Satisfactory: An average esponse

1 Weak An inaccurate esponse

0 No response r wrong response

SPM 2005 BIOLOGY P3

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Answer all questions.The time suggested o complete each question is 45 minutes.

An experiment was carried out to determine and compare he energy content nwhite bread and peanuts.

The mass of each food sample used was 5 g.The volume of distilled water used was 20ml.The density of water is 1gm/-l.

Figure 1 shows the set-up of the apparatus used in the experiment.

Thermometer

Boiling tube

Distilled water

Food sample

Needle

Plasticine

stand

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Figure 2 shows the initial water temperature or each food sample.

Initial water emperature .. . . . . . . . . . . . . . . . . . . . . . . . .o

FIGURE 2

highest water temperature after each food sample isable I shows thecompletely burnt.

Food sample Water temperature oC

White bread

Peanut

VV\Z

ffTABLE 1

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(a) (i) Record he nitial water emperature n the space rovided n Figure 2.

(ii) Record he final water emperature n the boxes provided n Table 1.13 marksl

(b) (i) State wo different observations made rom Table L.

Use1(a) iX

1 (D) i

1 (D) i

1.

2.

13 marksl

(ii) State wo inferences rom the observations n (bXi).

1 .

2.

f3 marksl

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(c) Complete Table 2 based on the experiment hat was carried out.

TABLE 2

@ State he hypothesis or this experiment.

16marksf

Variables Particulars o be mplemented

Manipulatedvariable

How to alter the manipulated variable

Respondingvariable

How to determine he responding ariable

Controlledvariable

How to maintain he controlled variable

ETTTIru'N

Us

r (a

I3marksl

ll ih b l h

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(e) (i) Construct a table to record the results of this experiment.Your table should contain the following titles:* Food sample* Increase n water temperature* Energy value

Specific heat capacity of water s 4.2 Jg*tog-t

Use the formula:

Energy value =

Mass of specific heat temperaturewater x capacity of water x increase

Mass of food

(ii) Based on the table nand the energy value

13marksl

(e)(i), state he relationship between he food classof each ood sample.

EmminUse

I (e) (

1 (e) i

13marksl

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Based on the result of the experiment, what can you deduce about theenergy value?

f3 marksf

G) This experiment was repeated using a cashew nut.Predict the observation and the energy value that will be obtained.

13marksl

ExatnU

ra

r

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(h) The picture shows various types of food samples:Margarine, rice, palm oil, boiled potato, cashew nut and maize.

Classify the food samples nto two food classes n Table 3, based on the energyvalue that is equivalent to that of white bread or peanut.

Food samples with equivalent energy value as

white bread peanut

13marksl

TABLE 3

ExamU

not

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Information:The mass and reshness of plant tissues are nfluenced by osmosis.Osmosis s influenced by the concentration of soluble substances nside and outsidethe cells.

Situation:A farmer has a rambutan orchard. Since the product of his orchard is abundant, hedecided o produce ambutan am. Before the rambutan ruits are processed nto jam,

the mass has o be maintained temporarily. Therefore, the farmer hasto determine the

solution and the concentration of the solution that should be used.

Peeled ambutan fruit

Rambutan ruit

Based on the above information and situation, design a laboratory experimentdetermine the concentration of the solution which will maintain the massplant tissues.

Use a suitable plant tissue when designing your experiment.

The planning of your experiment must nclude the following aspects:. Statement of identified problem

. Objective of study

. Variables

. Statement of hypothesis

. List of materials and apparatus

. Technique used

. Experimental procedure

. Presentation of data

. Conclusion

toof

Solution to maintain themass of rambutan fruit

END OF QUESTION PAPER

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Use

4SSll

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