answers paper 3

JABATAN PELAJARAN MELAKA

Dengan Kerjasama

PERSIDANGAN KEBANGSAAN PENGETUA-PENGETUASEKOLAH MENENGAH MALAYSIA

CAWANGAN MELAKA

PEPERIKSAAN PERCUBAAN

SIJIL PELAJARAN MALAYSIA 2007

BIOLOGI

KERTAS 3

SKEMA PEMARKAHAN

SCHEMA /Trial 2007 4551/3

SCHEMA BIOLOGYPAPER 3

TRIAL 20071(a) (i)

Score Explanation

3

Able to state two correct observation based on following criteria.P1 – type of drinking waterP2 – volume of urine output

1. The volume of urine collection for student who drank mineral water is 150 ml.

2. The volume of urine collection for student who drank 2.5 % sodium chloride solution is 80 ml.

3. The volume of urine collection for student who drank 5.0 % sodium chloride solution is 50 ml.

2 Able to state one correct observation and two inaccurate response.1. The volume of urine collected for student C is the lowest.2. Student A produce more volume of urine production.

1 Able to state one correct observation or two inaccurate response or idea.1. Different students collected different volume of urine.

0 No response or wrong response (response like hypothesis)

1(a) (ii) Score Explanation

3 Able to state two reasonable inferences for the observation.1. The higher of urine produce because less amount of water was reabsorbed

by adrenal caused by the hypotonic solution.2. The less of urine produce because more water was reabsorbed by adrenal

caused by the hypertonic solution that the student drank.3. Most amount of water reabsorb by adrenals cause the hypertonic solution,

the volume of urine is less.. 2 Able to state one correct inference and one inaccurate inference.

1. High volume of urine because less water was reabsorbed.2. Different samples of drinking water has different amount of reabsorbed

water.1 Able to state one correct inference or two inaccurate inference or idea.

1. The lower concentration//hypotonic of sodium chloride 2. The higher concentration//hypertonic of sodium chloride.

0 No response or wrong response (inference like hypothesis)1(b)

Score Explanation

3

Able to record three reading times with unit correctly.

0 % sodium chloride – 120 ml.2.5% sodium chloride – 100 ml.5.0 % sodium chloride – 50 ml.

2 Able to record any two readings. 1 Able to record any one readings.0 No response or wrong readings.

2


1(c) (i)Score Explanation

Able to state the variable and the method to handle variable correctly (√) for each variable and method

Manipulated Variable: Concentration of Sodium chloride (√) Method to handle: Used different concentration of sodium chloride. (√)

Responding Variable: Volume of urine output (√) Method to handle: Measured and Record the the volume of urine using measuring cylinder (√)Controlled variable : Volume of drinking water sample (√) Method to handle: All students drank 100 ml.(√)

3 Able to get all 6 (√) 2 Able to get 4 – 5 (√)1 Able to get 2 – 3 (√)0 No response or wrong response

1(c)(ii)Score Explanation

Answer;

3 Able to match the apparatus and material used to obtain data for the three variables correctly.

2 Able to match the apparatus and material for any two variables correctly.1 Able to match the apparatus and material for any one variable correctly.0 No response or wrong response

3

Variable Apparatus Material

Manipulated Measuring cylinderSodium chloride solution

RespondingMeasuring cylinder UrineBeaker Urine

ControllingStopwatch Urine Measuring cylinder Mineral water


1(d)Score Explanation

3 Able to state the hypothesis correctly based on the following criteria:P1 (manipulated) – State the concentration of sodium chloride.P2 (responding) – State the volume of urine collection. R - State the relationship between P1 and P2.

The intake of high concentration of sodium chloride, the volume of urine produce is lower. //The volume of urine collection for the intake of high concentration of sodium chloride is lower

2 Able to state the hypothesis but less accurate.

Different concentration of sodium chloride has different volume of urine//Different sample of water has different volume of urine.

1 Able to state the idea of the hypothesis.The volume of urine is different for each drinking water used.

0 No response or wrong response

1(e)(i)Score Explanation

3

Able to construct a table and record the result of the experiment which the following criteria:C – state all concentration of sodium chloride. (√)D – Transfer all data correctly. (V drinking, V urine)(√)T – calculate all the value of water absorbed by kidney (V drinking – V urine) (√)

Concentrate of sodium chloride

(%)

Volume of

sample drinking water (cm3)

The volume of urine after

drinking test water

(cm3)

Water reabsorb by kidney

(cm3)

0 % 500 150 3502.5 % 500 80 4205.0 % 500 50 450

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

1(e)(ii)Score Explanation

Able to draw the graph for relationship between the concentration of sodium chloride and the volume of water reabsorbP1 – Concentration of Sodium Chloride (x-axis) (√)P2 – The volume of reabsorbed water (y-axis) (√)P3 – Smooth curve (√)

3 Able to get all criteria correct2 Able to get any two criteria correct1 Able to get any one criteria correct0 No response or wrong response

4


0 0.1 0.2 0.3 0.4 0.5 Persentage of Sodium chloride(%)

Volume of water

reabsorbed(ml)

500

450

400

350

300

250

200

150

100

50

The volume of water reabsorbed against the percentage of sodium chloride

X

X

X


1(e)(iii)Score Explanation

3Able to explain the relationship between the concentration of sodium chloride solution and the water reabsorded. The increase of concentration of sodium chloride,will increase the volume of water absorbed by kidney.

2 Able to explain briefly the relationship between the concentration of sodium chloride solution and the volume of urine

The higher concentration of sodium chloride, the absorbing of water by kidney is higher.

1 Able to explain the idea the relationship between the concentrate of sodium chloride solution and the volume of urine

The water absorbed is higher/increase.0 No response or wrong response

1(f)Score Explanation

3 Able to state the definition of osmoregulation operationally, complete and correct, based on the following criteria.

C1 – volume of urine C2 – type of drinking waterC3 – student’s kidney

Osmoregulation is the regulation of the volume of urine output based on the type of test liquid drunk by student or absorbed by kidneys.

2 Able to state the definition of osmoregulation operationally based on any two criteria.

Osmoregulation is the regulation of the urine production by kidneys.1 Able to state the definition of osmoregulation operationally based on any

one criterion or an ideal.

Osmoregulation is urine production by kidneys to maintain the normal blood presure.


6


1(g)Score Explanation

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

C1 – state the volume of urine outputC2 – effect of temperature C3 – more urine produce.

His urine output is higher as 100 cm3 because low temperature decrease the tendency of water to diffuse into the collecting duct and more urine is produced.

2 Able to predict based on any two criteria.

The urine produce is higher because at low temperature renal absorb less water and produce more urine.

1 Able to predict based on any one criteria.

The urine produce is higher because renal absorb less water and produce more urine.


Question 2:

Score Explanation01

√Identified the problemP1 – level of pollutionP2 – different sources of waterStatement in question (?)

3 Able to state problem statement correctlyWhat is the level of polluted water/pollution in different sources of water?How different the level of polluted water for several sources of water?

2 Able to state problem statement but slightly incorrectWhat is the level of polluted water/pollution in water sample?

1 Able to state idea only (not in question)The pollution is different for each water sample.The level of polluted water/pollution is different for each water sample.

0 No response or wrong response.

√Objective of study/AimP1 – level of pollutionP2 – different sources of water

To determine the level of polluted water/pollution in several water river sources.

√ VariablesManipulated: the sample of water from different rivers.Responding: time taken for methylene blue to decolourise

Control : volume sample of water//volume of methylene blue//percentage of methylene blue.

7


02 √ Statement of hypothesisP1 – time takenP2 – different sources of water R – Relationship P1 and P2.

3 Able to state the hypothesis correctly by relating two variable correctly.1. The time taken for the methylene blue solution to decolourise water from

river A is faster compare to water from river B //1. The water sample A is the most polluted compared to water sample B.

2 Able to state hypothesis but slightly incorrect. Different sample of water has different level of water pollution//Different sample of water has different time taken to decolourise the methylene blue solution.

1 Able to state idea only.The shorter the time taken to decolourise methylene blue solution, the more polluted the water sample.

0 No response or wrong response.

05

√

List of apparatus250 ml Reagent bottle with stopper, Beaker, syringe , stopwatch,List of materials Water sample (at lease 4 type), methylene blue (0.1%), tissue

3 Able to list down 6 apparatus and 2 material.2 Able to list down 4 apparatus and 2 material.1 Able to list down 2 apparatus and 1 material.0 No response or wrong response.

B1 – 1

√

Technique usedRecord the time taken for methylene blue to decolourise by using stopwatch

04√

Experimental procedure

1. Water sample are collected from for five (//three) different river and add distilled water as controls. (K1)

2. six 250 reagent bottle are labeled as A, B, C, D,E and F. (K1)3. Each reagent bottle is filled with following water sample. (K3) (at least

three water samples) A – water from river 1 (or place A etc.)

B – water from river 2C – water from river 3D – water from river 4E – water from river 5F – distilled water

4. 1 ml methylene blue solution is added (K2) by using syringe to each reagent bottle. (K1)

5. Each reagent water then closed with stopper quickly (K1) and dried with tissue.(K5)

8


6. The content of reagent bottle cannot be shake. (K5)7. Each reagent bottles are kept in the dark place (cupboard) and then the

stopwatch is activated. (K4)8. The bottles are examined from time to time. (K1)9. The time taken for methylene blue decolorise is record (K4) in a table for

all water sample. (K4)Note:K1 – any three criteriaK2 – any one criteriaK3 – any three criteriaK4 – all three criteriaK5 – any one criteria

3 All 5K criteria correct2 3K – 4K criteria correct.1 At least 2K criteria correct.0 No response or wrong response.

B2 – 1 √

Presentation of dataData is presented in a table with right unit for Level of polluted water (for B2 1/time or 1/minute or minite-1)

Source of water

Time taken to methylene blue (minutes or seconds)

Level of polluted water (1/time)

If without the unit, give an idea (√) and B2 - 0. √ Conclusion

Write the hypothesis or another hypothesis.All the water sample is polluted.

03 Report writing3 Score 3 = 7-9 √

2 Score 2 = 4-6 √1 Score 1 = 1-3 √0 No response or wrong response.

Question 1: 33 MarksQuestion 2: 17 Marks(Total = 50 marks)

9

answers paper 3

Documents