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BIOLOGY 3Peraturan Pemarkahan

Peperiksaan Percubaan SPM 2010

QUESTION 1

1 (a) KB0603 – Measuring Using NumbersScore Criteria

3

Able to record all 4 Final length of cylindrical potato strip in the box given correctly.

The concentration of sucrose solution( M)

The final length of cylindrical potato strip (cm)

0.2

5.6

0.3

5.3

0.4

4.6

0.5 4.2

2 Able to record any 3 or 2 final length of cylindrical potato strip correctly.

1 Able to record any one final length of cylindrical potato strip correctly.

0 No response or all incorrectly

(b) (i) [KB0601 - Observation]Score Criteria

3 Able to state any two different observations correctly according to the criteria:

Must state the value of MV and RV:MV - The concentration of sucroseRV - The final length of cylindrical potato strip

Sample answers:1. In concentration of sucrose, 0.2 M, the final length of cylindrical potato strip is 5.6 cm 2. In concentration of sucrose 0.5M, the final length of cylindrical potato strip is 4.2 cm3. In concentration of sucrose 0.3M, the final length of cylindrical potato strip is 5.3 cm4. In concentration of sucrose 0.4, the final length of cylindrical potato strip is 4.6 cm

2 Able to state any one observation correctly.

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orAble to state any two incomplete observations ( any 2 criteria)

Not state the value one of 2 criteria

Sample answers:1. In concentration of sucrose lower, the final length of cylindrical potato strip is

5.6cm2. In concentration of sucrose higher, the final length of cylindrical potato strip is 4.2 cm3. The concentration of sucrose 0.2M, the final length of cylindrical potato strip is

long // longer4. The concentration of sucrose 0.5, the final length of cylindrical potato strip is short //

shorter

1 Able to state any one idea of observation.(any 1criteria)Sample answers:1. The final length of cylindrical potato depends on the concentration of sucrose.2. The concentration of sucrose influence the final length of cylindrical potato strip.3. The concentration of sucrose is different , the final length of cylindrical potato strip

is different

0 No response or wrong response.

ScoringScore Correct Inaccurate Idea Wrong 3 2 - - -

2 1 1 - -- 2 - -

11 - 1 -- - 2 -- 1 1 -1 - - 1

0 - 1 - 1- - 1 1

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1 (b) (ii) [KB0604 - Making inferences]

Score Criteria

3

Able to make one inference for each observation based on the criteria

State the :o The concentration of sucrose solutiono Reason ( movement of water )

Sample answers:

1. For 0.2 M / 0.3M sucrose solution is hypotonic / more concentration of water molecule compare the cell sap cause more water molecules move / diffuse into the cell sap of potato strip by osmosis .

2.For 0.4 M / 0.5M sucrose solution, is hypertonic / more concentration of water compare the cell sap cause more water molecules move /diffuse out from cell sap of potato strip by osmosis .

2

Able to make one inference for any one observation.or

Able to make one and incomplete inference Sample answer:for each observation.

Sample answers:

1. For 0.2 M / 0.3M sucrose solution more water molecules move / diffuse into the cell sap of potato strip by osmosis .

2.For 0.4 M / 0.5M sucrose solution, more water molecules move /diffuse out from cell sap of potato strip by osmosis .

1 Able to make an idea of inference with one criterion.

0 No response or wrong response.

ScoringScore Correct Inaccurate Idea Wrong 3 2 - - -

2 1 1 - -- 2 - -

11 - 1 -- - 2 -- 1 1 -1 - - 1

0 - 1 - 1- - 1 1

Note : Cannot repeat observation

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1(c) [KB0610–Variables]

3

Able to state all 3 variables and the 3 methods to handle the variable correctly. Sample Answer :

Variables Method to handle the variable correctlyManipulated variable

The concentration of sucrose solution

Use the different concentration of sucrose solution

OR

Change the concentration of sucrosesolution

Responding variable

The final length of (cylindrical) potato strip

Measure and record the length of cylindrical potato strip by using ruler

Constant variable

The volume/ quantity of sucrose solution // the initial length of cylindrical potato strip

Use the same / the volume of sucrose solution // quantity of sucrose solution // the initial length of cylindrical potato strip is 5cm

OR

Fixed the volume / quantity of sucrose solution // the initial length of cylindrical potato strip is 5 cm

.

6 ticks correctly

24 - 5 ticks correctly. Reject way how to handle variable if variable is wrong.

1 Able to state 2-3 ticks correctly

0Able to state 1 tick correctly or no respons

3 mark – 6 ticks2 mark – 4-5 ticks1 mark-2-3 ticks

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1(d) [KB0611- Making Hypothesis]

Score Criteria

3

Able to state a hypothesis to show a relationship between the manipulated variable and responding variable and the hypothesis can be validated, base on 3 criteria:

manipulated variable (P1) responding variable (P2) relationship (H)

Sample answer : 1. if the concentration of sucrose solution is increase / rise/ higher, the final

length of cylindrical potato strip is decrease/ lower // vise versa2. the higher concentration of sucrose solution, the lower / shorter final length of

cylindrical potato strip // vice versa

2

Able to state a hypothesis relating the manipulated variable and responding variable inaccurately with two criteria correctly :

Manipulated variable Responding variable No relationship/ incorrectly

Sample answer:1. if the concentration of sucrose solution is different , the final length of

cylindrical potato strip is different2. the different concentration of sucrose solution, the different final length of

cylindrical potato strip // vice versa

1

Able to state a hypothesis relating the manipulated variable at idea level, with one criteria correctly

Sample answer:1.Different concentration of sucrose solution influenced the final length of

cylindrical potato strip2.The final length of cylindrical potato strip depends on the concentration of

sucrose solution3.. The final length of cylindrical potato strip affected by the concentration of

sucrose solution.

0Not able to response or wrong response.

Note : directly proportional and inversely proportional are not accepted

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1(e)(i) [KB0606 – Communicating]

Score Criteria 3 Able to construct a table by using the criteria given

T : State all the title /aspects is given with the correct unitD : State all data for the 3 aspect C : All calculation / percentage changes in length correct

Sample answers

The concentration

of sucrose solution (M)

The initial length of potato strip

(cm)

The final length of potato strip (cm)

The percentage changes in the length of potato strip (%)

0.1 5 5.9 18

0.2 5 5.6 12

0.3 5 5.3 6

0.4 5 4.6 -8

0.5 54.2

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2 Able to record two criterias correctly

1 Able to record one criteria correctly

0 No response or wrong response.

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1 (e)(ii) [KB0612 – Relationship between space and time]

Score Criteria

3

Able to draw the graph correctly with the following aspects:

P(paksi) : Axes : Uniform scales on both horizontal and vertical axis – 1 mark

T (titik ) : Points : All points plotted correctly - 1 mark

B ( bentuk ) : Curve : Able to join all the points to form a smooth graph / passing through all point -ve gradient - 1 mark

Sample answer :X axes : MV –the percentage change in lenght (%)Y axes : RV - concentration of the sucrose solution

2 Any two correct.

1 Any one correct

0 No response or wrong response.

1(f) [KB0608 – Interpreting Data]

Score Criteria 3 Able to state the concentration of sucrose solution which is isotonic to the

concentration of the cell sap of the potatoes base on the graph and give a reasons. State all the criteria

Criteria:

P1: State the concentration of sucrose solution base on the graph ( intercept / cut on X axis ) : value accept 0.35M + 0.01P2: does not cause any changes to the length of the potato stripP3 : amount of water in and out of the potato strip / cell is the same.

Sample answer:

The concentration of sucrose solution which is isotonic to the concentration of the cell sap of the potatoes base on the graph is 0.35M , that does not cause any changes to the length of the potato strip because amount of water in and out of the potato strip / cell is the same.

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2 Able to state the concentration of sucrose solution which is isotonic to the concentration of the cell sap of the potatoes base on the graph and give a reasons.

State any two the criteria only.

Sample answer:

The concentration of sucrose solution which is isotonic to the concentration of the cell sap of the potatoes base on the graph is 0.35 M , that does not cause any changes to the length of the potato strip.

1 Able to state the idea of the relationship used base on one criteria Sample answer :

Sample answer:

1. The concentration of sucrose solution which is isotonic to the concentration of the cell sap of the potatoes base on the graph is 0.35M

0 Not able to response or wrong response.

1(g) [KB0605 – Predicting]Score Criteria

3 Able to predict the result accurately. Relationship : P1 = Able to state the changes of mustard green stem strips / condition P2 = Able to state inward P3 = Able to state the reason (movement of water)

Sample answer: 1. The mustard green stem strip will become shrink/ flaccid and curve inward( epidermis

outside ) because water molecules move out from cell sap (of the mustard green)

2 Able to predict the result less accurate base on two criterias:

Sample answer :1. The mustard green stem strip will become shrink/ flaccid and curve inward( epidermis outside ) because ( ANY INCORRECTLY REASON )

1 Able to give idea of the result base on one criterionSample answer :1. The mustard green stem strip will become shrink/ flaccid

0 Not able to response or wrong response.

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1(i) [KB0609 –Defining by Operation]

Score Criteria 3 Able to state correctly the meaning of osmosis process relationship base on three

criterias :

P1 : Osmosis concept based on the observationP2 : related to the different concentration of sucrose solutionP3 : Effect to the potato strips

Sample answer:Osmosis is a process which is potato strips immersed in sucrose solution cause water molecules move in / out of the potato strip across the plasma membrane depends on the different concentration of sucrose solution that will affect the length of potato strip.

2 Able to state the meaning of osmosis or as a concept base on two criterias :P1 and P2 // P1 and P3 // P2 and P3

1 Able to state the idea base on one criteria

P1/P2/P3 only0 Not able to response or wrong response.

1(i) [KB0602 – Classifying]Score Criteria

3 Able to classify all ( 4 pairs) correctly the concentration of sucrose solution with unit and conditions of mustard green into table 3

Sample answer:

Concentration of sucrose solution

Conditions of mustard green

0.2 M0.5 M0.6 M0.8 M

BACD

2 Able to classify 3 pairs correctly into table 3

1 Able to classify 2 pairs correctly into table 3

0 Able to classify one pair or no response

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QUESTION 2

PROBLEM STATEMENT

No. Mark Scheme Score     

2(i)KB061201

Able to state a problem statement relating the manipulated variable with the responding variable correctly 3

 

P1 : (Type of) food samples / white bread and cashew nuts.P2 : energy content/value in food samples/ final water temperatureH : question form and question mark(?)  

       Sample answer  

 

1. Which types of food samples, the white bread or cashew nuts , has a higher energy value/content?2. Do different types of food samples contain similar energy value / content?3. Do white bread / cashew nuts has a higher energy value/content compared to cashew nuts / white bread?

        Able to state a problem statement less accurately 2       Sample answer  

 

1. Which types of food samples, the white bread or cashew nuts , has a higher energy value/content. (no H)2. Do different samples contain similar energy value / content? (no P1)3. Do white bread / cashew nuts has a higher energy value/content ? (incomplete P1.4. Different types of food samples has different energy value/content? (no H)

        Able to state a problem statement at idea level 1       Sample answer  

 

1. Which food has higher energy? (no P1 and P2)2. Do white bread has a higher energy value.(no P1 and H)

      No response or incorrect response 0     

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AIM OF INVESTIGATION

No. Mark Scheme Score2 (ii) Able to state the objective of the investigation correctly  

 KB061203      Sample answer  

 To determine and compare the energy content/value in white bread and cashew nuts.  

     

HYPOTHESIS

No. Mark Scheme Score2 (iii)

KB061202Able to state a hypothesis relating the manipulated variable to theresponding variable correctly 3

 

P1 : type of food samples / white bread and cashew nuts.P2 : energy content/value (in food samples)H : relationship  

 

 # P1 must different food class

   Sample answer    1. Cashew nuts have a higher energy value/content than white bread.  

2. White bread has lower energy value/content than cashew nuts.

 

2. Different type of food samples contain different energy value /content.

 

 Able to state a hypothesis inaccurately*Have P1 and P2 or P1/P2 and H 2

       Sample answer  

 1. Type of food samples influences the energy value/content in food samples. (no H)  

 

2. Cashew nuts have a higher energy value/content. (incomplete P1)3. Type of food samples contains different energy value /content.4. Higher final water temperature, higher energy value (P1 twice)

   Able to state a hypothesis at idea level 1       Sample answer    White bread / cashew nuts has energy content/value. (only P2)         No response or incorrect response 0     

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VARIABLES

No. Mark Scheme Score2 (iv) Able to state all three variables correctly  

KB061203       Sample answer    Manipulated : (Type of) food samples // cashew nuts and white bread       

 Responding : The energy value of food samples // final water temperature  

     

 Fixed : Volume of distilled water / the mass of food / Initial temperature of distilled water  

     

LIST OF APPARATUS AND MATERIALS

No. Mark Scheme Score

2(v)

Able to list all the important apparatus and materials correctly.6-7 apparatus(A) + 5 materials (M) ## type of food sample must from different food class

3

KB061205 *compulsory apparatus and materials

   Sample answer  

 Apparatus : *boiling tubes, *thermometer, retort stand, pin, measuring cylinder, Bunsen burner and electronic balance.  

     

 Materials : *distilled water, *white bread, *cashew nuts, plasticine and cotton wool.  

   

       Able to list any 4-5 apparatus (including * ) and 3 * materials 2       Able to list any 2-3 apparatus (including * ) and 3 * materials 1       No response or incorrect response 0

 

 1 apparatus + 3 * materials

Remark : √ for title materials and apparatus for planning experiment.

 

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TECHNIQUE USED

No. Mark Scheme Score2 (iv)

KB061203Able to state the operating responding variable correctly using suitable apparatus B1 = 1

     Sample answer  

 

1. Measure and record the final / the increase in temperature of distilled water using a thermometer. or  

 

2. Calculate the energy value of food samples using a formula :

 

 

 Energy value = 4.2 (Jg-1 0C-1 ) x mass of water (g) x increase in temperature (0C) (kJg-1 ) Mass of food sample (g) x 1000

PROCEDURE

No. Mark Scheme Score

2 (vii)Able to describe the steps of experiment correctly based on the following aspects:  

KB061204  K1 : Preparation of materials and apparatus (any 4)    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)  

     Sample answers    1. Weight and record the mass of white bread.  

2. Fill a boiling tube with 20ml of distilled water.3. Clamp the boiling tube to the retort stand in an upright

position as shown in the diagram.

 4. Record the initial temperature of the distilled water in the

boiling tube.    5. Fix the white bread at the end of the pin.  

 

6. Ignite the white bread by holding it in the flame of a Bunsen burner. Then immediately place it beneath the boiling tube to heat the water.  

  7. Stir the water gently with the thermometer.  

 8. Record the final temperature of the distilled water in the

boiling tube.  

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9. Repeat steps 1-8 using cashew nuts to replace the white bread.

 

10. Calculate the energy value of the food samples by using the formula :

Energy value = 4.2 (Jg-1 0C-1 ) x mass of water (g) x increase in temperature (0C) (kJg-1 ) Mass of food sample (g) x 1000

   11. Record/tabulate all the results in the table.       K1 (any 4)  

 1.Weight white bread2. Weight chew nut  

  3. Fill the boiling tube    4. Clamp    5. Fix at the end of the pin  

6. Ignite7. place burning food under the boiling tube to heat the water.

  K2 (any 1)    1. Fix the volume of distilled water is 20ml    2. Fix the mass of food samples    3. Fix the initial temperature of water       K3 (any 1)    1. Record the final temperature of water by using thermometer  

2. Calculate the energy value of the food samples by using the formula :Energy value = 4.2 (Jg-1 0C-1 ) x mass of water (g) x increase in temperature (0C) (kJg-1 ) Mass of food sample (g) x 1000

K4 (any 1)1. Replaced / change the experiment with another food samples ( name the food sample from different food class)

Example:

Replace white bread with cashew nuts

K5 (any 1)1. Stir the water gently with the thermometer.

  2. Repeat experiment to get average reading.  3. Use an insulator shield to reduce heat loss to the surroundings.4. To ensure that the food is oxidized completely, make sure the food is burnt completely.

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  All 5 K 3       Any 3 - 4 K 2       Any 2 K 1       No response or incorrect response or 1 K only. 0

Remark:

1K - √ for title procedure for planning experiment.

No. Mark Scheme Score

2 (viii)Able to construct a table to record data based on the following aspects : B2 = 1

KB061203   1. Correct title and units (*titles –compulsory)    Sample answer  

 

 Types of food samples *

White bread * Cashew nuts *Mass (g)Initial temperature (oC)Final temperature (oC)Change in temperature (oC) *Energy value (J/g) / (kJ/g) *  

CONCLUSION

No. Mark Scheme Score2(ix) Able to make the right conclusion correctly  

KB061203       Sample answer  

 

Cashew nuts have a higher energy value/content than white breadHypothesis accepted

Reject : (only) Hypothesis accepted       

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PLANNING OF EXPERIMENT

No. Mark Scheme Score 2(x) Able to write the experimental planning  

 KB061203      1. Problem Statement    2. Aim    3. Hypothesis    4. Variables    5. Materials and Apparatus    6. Technique    7. Procedure    8. Result    9. Conclusion  

  7 - 9 ticks 3

  4 - 6 ticks 2       2 - 3 ticks 1     

 0 – 1 tickNo response or incorrect response 0

     

END OF MARKING SCHEME

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