Download pdf - JUJ Pahang SPM 2014 Biology K3 Set 2 Skema

8/10/2019 JUJ Pahang SPM 2014 Biology K3 Set 2 Skema

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SKEMA PEMARKAHAN PRAKTIS BESTARI JUJ PAHANG 2014 (SET 2 ) 4551/3

1SKEMA PEMARKAHAN PRAKTIS BESTARI JUJ PAHANG 2014

Question 1

No Mark Scheme Score

KB0603 Measuring Using Number

1(a)

Able to record all 3 readings for the time taken for salt solution to

move from mark A to mark B.

Number of triangles surfaces Time taken/min

4 42

8 28

16 13

3

Able to record any 2 readingscorrectly . 2

Able to record any 1 readingcorrectly. 1

No response or one reading0

KB0601 - Observation

1

(b)(i)

Able to state two correct observations based on the following

aspect :

P1 : Number of triangles surfaces

P2 : Time taken for salt solution to move from mark A to mark B

Sample answer

1.

When the number of triangles surfaces is 4, the time taken

for salt solution to move from mark A to mark B is 42

minutes.

2. When the number of triangles surfaces is 16, the time taken

for salt solution to move from mark A to mark B is 13

minutes.

3.

Increase the number of triangles surfaces increase the time

taken for salt solution to move from mark A to mark B .

3

Able to state one correct observation and one inaccurate

observation or able to state two inaccurate observation.

Sample Answer:

1.


for salt solution to move from mark A to mark B is the long.

2


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2.


for salt solution to move from mark A to mark B is shortest.

3. The number of triangles surfaces affects / influence the time

taken for salt solution to move from mark A to mark B.

Able to state one correct observation or able to state two

observations at idea level.

Sample Answer:

1. Time taken for Time taken for salt solution to move from

mark A to mark B are 42 min / 28 min / 13 min.

2.

Time taken for Time taken for salt solution to move from

mark A to mark B increased / decreased

3.

Time taken for Time taken for salt solution to move frommark A to mark B change.

1

No response or wrong response. 0

Scoring

Correct Inaccurate Idea Wrong Score

2 - - - 3

1 1 - -2

- 2 - -

1 - 1 -

1- - 2 -

1 - - 1

- 1 1 -

- 1 - 10

- - 1 1


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KB0604 - Making inference

1(b)(ii)

Able to state two inferences correctly based on the following

aspect:

P1 : surface area

P2 : diffusion of distilled water / rate of diffusion

Sample answer

1.

(4 triangular) increase / more the total surface area (of the

potato block), increase rate of diffusion / more ( water will

diffuse into the potato block.

2. (16 triangular) decrease total surface area of the potato block

is the decrerase, rate of diffusion of (water) into the potato

block

3. The surface area of the potato block is the lowest/highest, rate

of distilled water diffusion is lowest/highest.

3

Able to make one correct inferences and one inaccurate

inference

Sample answers:

1. The rate of diffusion is highest / lowest.

2.

The total surfaces area is the highest / lowest.

2

Able to state one correct inference and one inference at idea level.

Sample Answer:

1. Water diffuse into potato block

1

No response OR wrong response.

Scoring:

Score Correct Inaccurate Idea Wrong3 2 - - -

21 1 - -

- 2 - -

1

1 - 1 -

- - 2 -

- 1 1 -

0- 1 - 1

- - 1 1


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KB0610-Controlling variables

1(c)

Able to state all 3 variables and the 3 methods to handle the variable

correctly.

Sample Answer :

VariablesMethod to handle the variable

correctly

Manipulated variable

Number of triangles

surfaces / Total surface

area

Use different number of triangles

(surfaces which are 4, 8, 16 )/

Change the number of triangles

surfaces that are 4, 8, 16.

Responding variable

Duration/ Time taken for

salt solution to move from

mark A to mark B/ Rate

of Diffusion

Measure and recordthe time taken

for salt solution to move from mark

A to mark B by using stopwatch.

Calculate the rate of diffusion by

using the formula:

Distance from A to B , cm

Time taken for salt solution to move

from mark A to mark B, min

Constant variableConcentration of salt

solution / Distance from

A to B / Size of potato

block

Fix the same concentration of salt

solution that is 10%. / Fix the same

distance from A to B which is 3 cm /

used the same size of potato block is

5cm x 7cm

All 6 ticks

3

Able to state 3- 5 ticks 2

Able to state 1-2 ticks 1

No response or incorrect response0


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KB0611-State hypothesis

1 (d) Able to make a hypothesis based on the following aspect :

P1 : Manipulated variable ; Number of triangular surface / totalsurface

P2 : Responding variable ; Time taken for salt solution move from

A to B / rate of diffusion

R : Relationship

Sample Answer :

1.

The higher / the number of triangles surfaces, the shorter the

time taken for salt solution to move from A to B./ vice versa

2.

The higher the total surfaces area of potato block, the shorterthe time taken for salt solution to move from A to B./ vice

versa

3.The higher the number of triangles surfaces, the higher the

rate of water diffusion./ vice versa

4.

The higher the total surfaces area of potato block, the shorter

the time taken for salt solution to move from A to B/ vice

versa

3

Able to make a hypothesis relating the manipulated variable andresponding variable inaccurately

Sample Answer:

1.

Different number/size of triangles surfaces, different the time

taken for salt solution to move from A to B.

2. The number/size of triangles surfaces, affects the time taken

for salt solution to move from A to B.

3. The number/size of triangles surfaces, effects the rate of

water diffusion

2

Able to state a hypothesis relating the manipulated variable at

idea level, with one aspect correctly.

Sample Answer :

1. Different number / size of triangles

2. Different rate of diffusion

1

No response or wrong response if no P1 or P2 no mark for each. 0


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KB0606 Communicating data

1(e)(i)

Able to construct a table which contain the following aspects:

P1: Able to state the 3 titles with unitscorrectly.P2 : Able to record all data correctly.

P3 : Able to calculate the rate of diffusion

Sample answer :

Number of

triangular

surfaces

Time taken for salt

solution to move

from A to B,/cm

Rate of

Diffusion,/cmmin-1

4 42 0.07

828 0.11

16 13 0.23

3

Any two aspects correct2

Any one aspect correct 1No response or wrong response. 0

KB0607 Relationship between space and time

1(e)(ii)

Able to plot the graph correctly :

Criteria:

P : Correct Axis with label, uniform scale and unit

: Y axis, Rate of Diffusion

: X axis, Number of triangles surfaces

T : All points plotted

B : Joint all 3 points

3

Any two criteria 2

Any one criteria. 1

No response or wrong response.

0


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KB0608 Interpreting the data

1(f)

Able to explain the relationship between the number of

triangular surface and the rate of diffusion accurately.

Sample answer:

R1: Increase the number of triangular surface increase the rate of

diffusion of water

E1: Increase total surface area

E2: More water molecule diffuse in the potato block in the short

time

All three aspects

Note : If R1 wrong, reject E1 & E2

3

Two aspects including R1

Example : R1 + E1 / R1 + E22

Only R1 stated 1

No response or incorrect response 0

KB0609 Defining by operation

Able to state the operational definition of rate of diffusion based on

the following aspects:

P1 : Shows time taken of salt solution move from A to B

P2 : in different number of triangular surface of potato block

P3 : increase the total surface of potato, increase rate of diffusion

of water // rate of diffusion of water depends on the total

surface of potato block

Sample answer

The rate of diffusion is time taken for salt solution to move from A

to B when different number/size of triangles surface is used.

Increase the total surface area of potato block, increase the rate of

diffusion / of (distilled water) diffused into the potato block .

3

Any two criteria stated 2

Any one criteria stated // theoretical definition 1

No response or wrong response.0


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KB0605 - Predicting

1(h)

Able to predict using all the following criteria :

P1 : Correct prediction , state the value

E1 : Reason

E2 : Effect

Sample answer

P1 : Time taken for salt solution move from A to B is less than 13

minutes // any value less than 13minutes .

E1: High gradient concentration between distilled water and 30%

salt solution

E2: The rate of water diffusion into potato block will be faster /Increase / more than 0.23cmminutes-1// More water molecule

diffuse into potato block in the short time.

3

Any two aspects:

P( idea) + 2E // P1 + 1E // P1 + E2

2

Any one aspect:

P( idea) + E1 // P1 (idea) + E2

1

No response or wrong response 0

KB0608 Interpreting the data

1(i)

Able to classify all the organ in table correctly:

Organs having well adapted

surfaces for their effectivefunction

Organs without surfaces well

adapted fortheir effective function

Small intestinesLungs

Brain

EsophagusPancreas

LiverHeart

3

Able to get 4-6 tick correctly2


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Able to get 2-3 tick correctly 1

No response or wrong response0

TOTAL SCORE - 11 X 3 = 33 marks

QUESTION 2

PROBLEM STATEMENT (01)

No. Mark Scheme Score

2(i)

KB061201

Able to state a problem statementrelating the manipulated variable

(MV) with the responding variable (RV) correctly

3

3P

P1 : Manipulated Variable

(Substrate concentration)

P2 : Responding variable

(Rate of enzyme reaction // time taken for iodine reaction remain

unchanged)

P3 : Relationship between the variables in a question form

(Question form)

Sample Answer :

1. What is the effect of concentration of starch suspension on the

rate of amylase / enzyme reaction / activity ?

2. How does the concentration of starch suspension / substrate

affects the rate of amylase /enzyme reaction / activity ?


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Able to state a problem statement with two aspects.

Sample Answers:

1. What is the effect of starch suspension concentration on

amylase?

2. How does starch suspension affect the rate of reaction /

activity of amylase / pepsin?

3. What is the effect of concentration of starch suspension on the

rate of amylase / enzyme reaction / activity

2

P1, P2

P1, P3

P2, P3

Able to state a problem statement with one aspect.Sample answer

1. What is the amylase concentration?

2. Starch / substrate concentration affects amylase.

1

P1 / P2

No response or incorrect response

** Only P3 Reject0

HYPOTHESIS (02)


2 (ii)

KB061202

Able to state the hypothesis correctly by relating two variables.

Criteria set:


(Substrate concentration)

P2 : Responding variable

(Rate of enzyme reaction // time taken for iodine reaction remain

unchanged)

P3 : Show the specific relationship and direction between the

manipulated variable and the responding variable

3

3Ps


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Sample Answer :

1.

The rate of amylase / pepsin / enzyme reaction /activity

increases with the increase in starch concentration (until it

reaches a maximum rate).

2. As the concentration of starch increases the time taken for the

hydrolysis of starch/ albumen to be completed increases.

Able to state a hypothesis inaccurately based on any two aspects.

2

Sample answer

1. Starch concentration increases the rate of enzyme / amylase

reaction / activity.

2. Enzyme concentration affects the rate of amylase

/enzyme reaction / activity

Able to state a hypothesis at idea level

Sample answer

1. The rate of amylase activity change

2. The time taken for the hydrolysis of starch change 1

No response or incorrect response 0

VARIABLES (03)


2 (ii) Able to state all threevariablescorrectly

KB061203 3Sample answer

1. Manipulated :

Starch / substrate concentration

2. Responding :

Time taken for iodine solution remain unchanged // Rate of

enzyme reaction


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3. Fixed :

Volume of starch suspension / enzyme // Concentration of

enzyme solution // Temperature of water bath.

Able to state any two variables correctly2

Able to state any one variables correctly1


LIST OF APPARATUS AND MATERIALS (04)

2 (iv) KB061205

Apparatus Materials Score

Test tubes, beakers, Stop watch

Syringes, Termometer, Glass

rods

White tile ( with groove)

Droppers

Amylase solution,

Starch suspensions , iodine

solution, distilled water

3

7- 8A + 4M

Amylase solution,

Starch suspensions , iodine

solution

25 - 6A + 3M

Amylase solution,

Starch suspensions , 1

3 - 4A + 2M

PROCEDURE ( 05)

2 (v)KB061204

No Description Keywords Ks

1.Four test tubes are labelled A to D labelled K1

2.Each test tube is added the following mixtures.

A : 5 ml 0.2% starch suspension

B : 5 ml 0.4% starch suspension

C : 5 ml 0.6% starch suspension

D : 5 ml 0.8% starch suspension

5ml K2

0.2%, 0.4%, 0.6%, 0.8% K4

3. The test tubes are immersed in water bath at 37oC immersed K1


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37oC K2

4.Drops of iodine solution are added separately onto the grooves

of a white tile using a syringeDrop K1

5. 1 ml of 1% amylase is added into each test tube 1ml & 1% K2

6. The stopwatch is started immediately (0 minute)start K1

7. The contents are stirred with a glass rod.A drop of mixture is

tested with iodine solution on the white tile. At every sampling

the dropper must be rinsed with clean distilled water.

stiredK1

dropper must be rinsed with

clean distilled water.K5

tested with iodine solutionK1

8The step is repeated at 30 second intervals until the mixture

stops turning blue black in colour when tested with iodine

solution.

activated K1

9.Time taken for the hydrolysis of starch to be completed is

recorded by using stopwatch.Record , stopwatch K3

10.The data is recorded in the table.

Record, table K1

11. Steps 4-10 are repeated with test tubes B, C, and D Repeat - B, C, D K1

12. Experiment is repeated three times to get accurate reading /

result.

repeated three times /

accurate

K5

K1 : Preparation of materials and apparatus (any 5)

K2 : Operating the constant variable (any 1)

K3 : Operating the responding variable (any 1)

K4 : Operating the manipulated variable (any 1)

K5 : Steps to increase reliability of results accurately / precaution (any 1)


2 (v)

Able to describe all the Ks

5 K

3

Any 3-4 K2

Any 1-2 K 1



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PRESENTATION OF DATA ( 06)

2 (vi)KB061203


2 (vi)

Able to construct a table to record data based on the following criteria:


P2 : Operating RV and RV with unit

Sample answer:

Concentration of

starch suspension

(%)

Time taken the hydrolysis of

starch to be completed // iodine

remain unchanged ( minutes )

Rate of enzyme

reaction

= 1 _

Time

( minute-1 )

0.2

0.4

0.6

0.8

2

KB061203

Able to construct a table to record data based on one aspect only1


END OF MARKING SCHEME

P1

P2