Marking scheme P3 2010

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Skema jawapan biologi

Peperiksaan Percubaan Biologi SPM 2010 Panitia Biologi Negeri Perlis

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MARKING SCHEME : PAPER THREE TRIAL BIOLOGY 2010Question 1 : 1(a)

Score Explanation

3

Able to recordall readings of volume of urine produced

Student Volume of urine in the firstexperiment/ml

Volume of urine in thesecond experiment/ml

A 80 82B 150 170C 200 250D 360 370

2 Able to record any 4-5 volume1 Able to record any 2-3 volume0 No response or wrong response

1(b)(i)Score Explanation

3

Able to state two correct observations based on following criteria.C1 volume of water intake

C2 volume of urine producedSample Answer:(either 2):

1. When the volume of water intake is 100 ml, the volume of urine produced infirst experiment is 80ml and second experiment is 82 ml.

2. When the volume of water intake is 400 ml, the volume of urine produced infirst experiment is 360 ml and second experiment is 370 ml.

2 Able to state one correct observation and one inaccurate response.1 Able to state one correct observation or two inaccurate response or idea.0 No response or wrong response (response like hypothesis)

1(b) (ii)

Score Explanation

3

Able to state two reasonable inferences for the observation.

Sample answer:1. When the volume of water intake is less, more water is reabsorbed, less urine is

produced2. When the volume of water intake is more, less water is reabsorbed, more urine

is produced

2 Able to state one correct inference and one inaccurate inference.1 Able to state one correct inference or two inaccurate inference or idea.0 No response or wrong response (inference like hypothesis)


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1(c)Score Explanation

3

Able to state all the variables and the method to handle variable correctly() for each variable and method M anipulated Variable: Volume of water intake ()M ethod to handle: Repeat the experiment by drinking different volume of water ()

Responding Variable: Volume of urine produced ()M ethod to handle: M easure and record the volume of urine produced after half anhour by using measuring cylinder.()

Controlled variable : type of water intake/ duration to collect urine ()M ethod to handle: . drinksame type of water/ fix the time to collect urine ()

Able to get 6 (with the correct key words)2 Able to get 4 5 1 Able to get 2 3 0 No response or wrong response

1(d)

Score Explanation

3

Able to state the hypothesis correctly based on the following criteria:V1 State the volume of water intakeV2 State the volume of urine producedR - State the relationship between V1 and V2.

The more the volume of water intake, the more the volume of urine produced.2 Able to state the hypothesis but less accurate.1 Able to state the idea of the hypothesis0 No response or wrong response

1(e)(i)

Score Explanation

3

Able to construct a table and record the result of the experiment with the followingcriteria: volume of water intake(ml) () average of volume of urine produced (ml) ()- percentage of urine produced (%) ()

If without unit (x)

StudentsVolume of

water intake/ml

Volume of urineproduced/ml

Average of volume of

urine

produced/ml

Percentage of volume of urineproduced / %First

experiment

Second

experiment A 100 80 76 78 78B 200 150 170 160 80C 300 2 50 250 250 83D 400 360 370 365 91

2 Able to construct a table and record any two criteria1 Able to construct a table and record any one criteria0 No response or wrong response


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3

1(e)(ii)Score Explanation

3

Able to draw a bar chart of percentage of urine produced against the volume l of water intake. Axes (A) both axis are labeled with units, uniform scales, independent

variable on horizontal axis. ()Point (P) All points are correctly plotted. ()Shape (S) All bars are correctly drawn ().

2 Graph with any two criteria.1 Graph with any one criteria.0 No response or wrong response.

1(f)Score Explanation

3

Able to explain the relationship between the volume of water intake and thevolume of urine produced correctly.

When the volume of water intake is more, the volume of urine produce also morebecause less water is reabsorbed

2 Able to explain briefly the relationship between the volume of water intake and volumeof urine produced1 Able to explain the idea the relationship between the volume of water intake andvolume of urine produced0 No response or wrong response


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4

1(g)Score Explanation

3

Able to state the definition of urine correctly, based on the following criteria.

C1 waste product (in the form of liquid)C2 excreted by humanC3 influence by volume of water intake

Urine is a waste product in the form of liquid excreted by human and influent by thevolume of water intake

2 Able to state the definition of urine based one of the two criteria.1 Able to state the idea of urine0 No response or wrong response

1(h)Score Explanation

3

Able to predict correctly and explain the prediction based on the following item:

C1 the volume of urine producedC2 blood osmotic pressure

C3 - reabsorption of water The volume of urine produced is less than 78 ml because after drinking 5% sodiumchloride solution, the blood osmotic pressure increases , therefore more water isreabsorbed thus the volume of urine produced is less.

2 Able to predict based on any two criteria.1 Able to predict based on any one criteria.0 No response or wrong response

1(i)Score Explanation

3

Able to classify the apparatus and material used in the experiment

Apparatus MaterialsMeasuring cylinder Plain water

Drinking bottle Stopwatch

Able to classify all the apparatus and material correctly.

2 Able to classify two apparatus and one material correctly.

1 Able to classify one apparatus and one material correctly.

0 No response or wrong response


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Question 2 :

Aspect Sample Answer RemarksProblem statement

Which water sample is most polluted? /Which area contains water that is most polluted?

3 marks

Aim/objective To study the level of water pollution in three different water samples.

HypothesisThe nearer the area of water sample to the factory/farm, thehigher the level of water pollution.

3 marks

VariablesM anipulative variable: river water samplesResponding variable: time taken for methylene blue solution to

decolouriseFixed variable: volume of water sample/concerntration of

methylene blue solution

Apparatus andmaterials Apparatus: measuring cylinder, stopwatch, reagent bottle,

collecting cup

M aterials : 0.1% methylene blue solution, water samples

All present 3marks 2 materialsand 3-4 app 2 marks2 materialsand 2 app 1mark

Technique used Observe and record the time taken by methylene blue solution todecolourise B

Procedure1. Water sample are collected from three different area by

using collecting cup KP,KM V2. Three reagent bottles are labelled X,Y and Z and filled with

100 ml of water sample from village X, Y and Zrespectively.-KFV & KM V

3. The tests are run for all the water samples on the sameday-KP, KFV

4. A syringe is used to add 1 ml of 0.1% methylene bluesolution to the base of each the water sample.KP, KFV

5. M ake sure the reagent bottles are closed quickly andplaced in the dark cupboard.-KC

6. The stopwatch is started.-KP7. The bottles are examined at 1 hour intervals- KP, KFV8. The time taken for the methylene blue to decolourise is

recorded for all the water samples- KRV9. The results are recorded in the table .KP

8 - 9P 3 m

6 - 7P 2 m

3 - 5P 1 m

3 marks

KP Step1,3,4,6,7,9

(any 5)KMV Step 1,2 KRV Step 8,KFV- Step2,3,4,7 KC Step 5


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END OF MARKING SCHEME

Presentation of data

Able to draw a complete table to record the relevant data baseon the 3 criteria:

y Water samplesy Time taken for methylene blue to decolourisey Level of water pollution

S ample Answer

Water sample X Y Z

Time taken for methylene blue

solution todecolourise/min

Level of water pollution

B

ConclusionHypothesis is accepted.The nearer the water sample to the farm/factory, the higher thelevel of water pollution /The nearer the water sample to the farm/factory, the shorter thetime taken for methylene blue to decolourise

PlanningKB061203 Able to state correctly

8 9 aspects (correct) - 3 marks 6 7 aspects (correct) - 2 marks3 5 aspects (corect) - 1 mark < 3 - 0 mark

3 marks

Report Able to state correctly:y presentation of data andy technique.

2 correct - 2 marks1 correct - 1 mark

2 marks

TOTAL 17 Marks

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Marking scheme P3 2010