Mark scheme P3 Melaka (SPM)

8/8/2019 Mark scheme P3 Melaka (SPM)

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4551/3 2010 Hak Cipta PKPSM MELAKA SULIT

Answer scheme

Biology Paper 3

Question 1

No Mark Scheme Score1(a) Able to record the number of solid particles as seen under microscope

(10X10) in Table 1 correctly.Sample answers:

Places whereslide is located

Number of solid particles as seenunder microscope (10X10)

Set A 5Set B 8Set C 12Set D 20

3

Able to record 3 correct and 1 incorrect answer 2 Able to record 2 correct and 2 incorrect answers 1 Able to record 1 correct and 3 incorrect answersNo response or wrong response

0

1(b) (i) Able to state two different observations correctly according 2 criteria:y Places where slide is located (MV)y Number of solid particles as seen under microscope (10X10) in

Table 1 correctly (RV)

Note: Observation must match with inference

Sample answers1. In Set A/air-condition room, the number of solid particles as seen

under microscope (10X10) is 5.2. In Set D/school car park, the number of solid particles as seen

under microscope (10X10) is 20.3. In Set C/school canteen, the number of solid particles as seen

under microscope (10X10) is 12..4.

3

Able to state any one observation correctly. or

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

Sample answers1. In set A / set D the number of solid particles as seen under the

microscope (10X10) is less/more.2. In set D the number of solid particles as seen under microscope

(10X10) is more than the number of solid particles as seen under microscope (10X10) in set A / set B / set SetC

2


2/10

2


Able to state any one idea of observation.(any 1criteria)

Sample answers (idea level)1. The number of particles as seen under the microscope (10X10) in

each sets are different.2. Different set give different number of particles as seen under the

microscope (10x10)

* must stated the viewing power of the microscope (10X10)

1

No response or incorrect response or one idea only 01(b)(ii) Able to make two correct inferences base on three aspects:

y Number of solid particles as seen under microscope (10X10) isless/more

y Level of air pollution is lower / higher y Cleanest / dirtiest environment

Note: Inference must match with observation

Sample answers:

1. In set A, the number of solid particles as seen under themicroscope(10X10) is less because the level of air pollution is lower indicate that it was the cleanes environment.

2. In set D the number of solid particles as seen under microscope(10X10) is more than the number of solid particles as seen under microscope (10X10) in set A / set B / set set C because the level of air pollution is higher indicate that it was dirtiest environment.

3

Able to make one logical inference for any one observation .O r

Able to make one logical and incomplete inference base on one criterion for each observation.

Sample answers:1. In set A / set D the level of pollution is lowest / higher to show that

the environment is clean / dirty.2. In set A / set D the number of solid particles as seen under the

microscope (10X10) is less / more because level of air pollution islower/higher

2

Able to state only one correct inference

Or Able to state two inferences at idea levelSample answers:

1. Air pollution is highest/lowest2. Clean/dirty place.

Or any other suitable answer.

1

No response or incorrect response 0


3/10

3


1(c) Able to state all 3 variables and methods to handle each variable

Sample answers:

Variables Method to handle the variable

Manipulatedvariable:Location where glassslide is placed

Glass slides are put at different location

Respondingvariable :Number of solidparticles as seenunder a microscope(10X10).

Count and record the number of solid particlesas seen under by using a microscope (10X10).

Constant variable:Time exposure// sizeof cellophane tape onthe glass slide

Fix two days for exposure for each set//Use the same size of cellophane tape on each of glass slide.

3

Able to state 4-5 ticks

Able to state 2-3 ticks

No response or incorrect response or 1 tick only 0

1(d) Able to state a hypothesis relating the manipulated variable and theresponding variable correctly with the following aspects:P1 = Manipulated variable (Places where glass slide is located )P2 = Responding variable (number of solid particles as seen under a

microscope (10X10) / level of air pollutionH = relationship

Sample answers:

1. Air sample in school park is more //less polluted than air sample inan air-conditioned room/ class room/ school canteen

2. The number of solid particles in school park air sample ishigher/lower than air sample in an air-conditioned room/ class room/school canteen

3

Able to state a hypothesis relating the manipulated variable and theresponding variable but inaccurately

2


4/10

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Sample answers:1. Different location of slides have different number of solid particles as

seen under a microscope (10x10).2. Different location of slide influence/affect the number of solid

particles as seen under a microscope (10x10) Able to state one idea of a hypothesis

Sample answers:1. Number of solid particles as seen under the microscope (10x10)

varied/different.2. Level of air pollution is varied.

1

No response or incorrect response 01(e) (i) Able to construct a table correctly with the following aspect.

T : Titles 1 markS : Places where glass slide is located 1 markD : Number of solid particles as seen under 1 mark

a microscope (10X10)Sample answers:

Places where glass slide islocated

Number of solidparticles as seen under a microscope (10X10)

Air-conditioned room 5Class room 8

School canteen 12School car park 20

3

Able to draw a table with incomplete data 2 Able to draw a table without data 1No response or incorrect response 0

1(e)(ii)

Able to draw a graph of the number of solid particles as seen under microscope (10X10) against the places where the glass slide is locatedinclude the following aspects:

P : Correct title of x-axis and y-axis with unit anduniform scale on the axisx-axis : Places where the glass slide is locatedy-axis : Number of solid particles as seen under amicroscope (10X10).

1 mark

T : Correct data transferred / all points plotted 1 markB : Bar graph 1 mark

3

Any two correct aspects Any one correct aspects No response or incorrect response 0

1(f) Able to explain the relationship between the places where glass slide islocated and the number of solid particles as seen under a microscope :

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5/10

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y P1- Places where the glass slide is locatedy P2- Number of solid particles as seen under a microscope (10X10)y P3- Reasoning / Air pollutants (dust , smoke, soot)

Sample answers:1. In set A /air-conditioned room, the number of solid particles seen

under microscope (10X10) is lowest thus the existence of air pollutants (dust, soot,,smoke) also less and not polluted.

2. In set D/ school car park the number of solid particles as seen under a microscope (10X10) is highest this because of exhaust fumes emitlarge amounts of soot and particles as a result of combustion of fossil fuels.

3. In set B/ class room contain few numbers of solid particles as seenunder a microscope (10X10) because the doors and windows areclosed thus less dust and particles in the environment.

4. In set C/ school canteen the number of solid particles is higher compared to in set B/A because it was an open air area whichcontains more particulate matter.

Able to explain the relationship using any two criteria

Sample answer:1. In set A/ air-corndition/set D/School car park the number of solid

particles as seen under a microscope (10X10) is lowest / highest.

2

Able to explain the relationship using one criteria

Sample answer:1. Number of solid particles as seen under a microscope (10X10) is

depends on places.2. Different places affect the number of solid particles seen under a

microscope (10X10).

1

No response or incorrect response 01(g) Able to state the definition of air pollution operationally, complete and

correctly based on the following criteria:

D1 : Number of solid particles as seen under a microscope(10X10)D2 : Places where the glass slide is locatedD3 : Level of air pollution

Sample answers:That

1. Air pollution is an air sample with the presence of solid particles andthe level of air pollution is affected by the location where the glassslides are placed; the higher the number of the solid particles, thehigher the level of air pollution

3

Any two criteria stated Any one criteria stated


6/10

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No response or incorrect response 01(h) Able to predict the outcome of the experiment correctly based on the

following criteria:

C1 : Prediction on the number o solid particles as seen under themicroscope (10X10) relative to set D

C2 : Condition at the construction siteC3 : Level of pollution

Sample answers:The number of solid particles as seen under a microscope is 50 (morecompared to set D). In the construction area there will be more particulatematter (soot, dirt, dust) compared to set D indicates that area has highestlevel of air pollution compare to other places.

3

Any two criteria stated Any one criteria stated No response or incorrect response 0

1(i) Able to classify all the materials and apparatus correctlySample answers:

MATERIALS (M) APPARATUS (A)Distilled water Reagent bottles0.1 % methylene blue solution SyringePond water River water Drain water

All five materials and two apparatus are correct

3

Refer to the scoring below 2Refer to the scoring below 1Refer to the scoring below 0

Scoring:

MATERIALS APPARATUS SCORE

5M 2A 3

4M 2A 23M 2A

2M 2A 1

2/3/4M 1A 0

QUEST ION 2


7/10

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CONSTRUCT

SAMPLE ANSWERS NOTES ON SCORING

1.OBJECTIVE(Ob)

1. To study the effect of wind/air speed onthe rate of transpiration.

No mark just a TICK

2. PROBLEMSTATEMENT (Ps)

01

A ble to relate P1, P2 and H in a questionform.1. What is the effect of different speed of air

movement on the rate of transpiration ?

2. Does the speed of air movement affect therate of transpiration?

3. Is different speed of air movementaffect the time taken of air bubbles tomove from A to B ?

P1 = MVP2 = RVH = question

P1 + P2 + H = 3 marks

MV = speed of air movementRV = rate of transpiration/time taken of air bubbleto move.H = a question (?)

A ble to state problem statement inaccurately1. Does the speed of air movement affect

the rate of transpiration . (no ?)2 . What is the effect of air on the rate of

transpiration?3 . Does the air movement have

relationship withm the rate of transpiration?

4 . Different speed of air movement Affect the time taken of air bubble tomove from A to B.

Only two aspects

P1 + P2 = 2 marks

A ble to state the idea1. What is the effect of air movement?2. Air movement affect distance of air

bubble.3. Different air speed affects transpiration.

Only one aspectP1/P2

1 mark

3.HYPOTHESIS (Hp)

02

A ble to state the hypothesis by relatingtwo variables correctly (P1+P2+H)

1. The fastest/slowest the speed of air movement (P1), thehigher/lower//fastest/slowest the rate of transpiration/time taken of air bubble tomove from A to B (P2).

*Relationship of Hypothesis is notnecessarily correct.

P1- manipulated variableSpeed of air movement P2-responding variableRate of transpiration /

time taken for the air bubble to move.H-relationship

P1+P2+HP1 + P2 + H = 3 marks

A ble to state any two criteria correctlyor inaccurate hypothesis

1. The speed of air movement (P 1) affectthe rate of transpiration/time taken to air bubble move from A to B. (P2) (no H)

2. The rate of transpiration/time taken for the

Only two aspects

P1+P2/P1+H/P2+H

2 marks


8/10

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air bubble to move from A to B dependson the wind/air speed.

3. Speed of air movement increases therate of transpiration/time taken for air bubble to move from A to B.

A ble to draw the idea of hypothesis1. Different wind speed affect the

plants ( no P2 + H )

Only one aspect

P1/P2/H1 mark

4.VARIABLES(Vr)

Manipulated The speed of wind/ air movement

Responding The rate of transpiration//time takenfor air bubbles movefrom A to B.

Fixed Temperature// lightintensity // humidity.

No mark just a TICK

5. APPARATUS ANDMATERIALS(AM)

05

A ble to list 3 materials and 5 apparatuscorrectly to make a functional experimentand able to get the data MATERIALS:1. Leafy shoots (Balsam plant)2. Distilled water 3. Vaseline

APPARATUS:1. Capillary tube2. Rubber tubing3. Stopwatch4. Beaker 5. Tissue paper/cloth7. Marker pen/Thread8. Fan

materials

apparatus

score

3M 8A 3 ( )3M 7A 2 ( )3M 6A2M 5A

4A3A

1( )

1M 2A1A

0 ( )


9/10

9


6.TECHNIQUE(Tq)

Able to state the operating responding variablecorrectly with suitable apparatus

1. Record the t ime taken for the air bubble to move a distance of 5 cm(from A to B) by using stopwatch

B1 = 1 mark

7.PROCEDURE(K)

04

A ble to state K1, K2, K3, K4 and K5 (5K)correctly

K1: The set up of materials and apparatus(S1/S2/S3/S4/S5/S6/S7/S8/S10/S11/S12/S13) A NY 5 .

K2: Operating the constant variable (S4 )K3: Operating the responding variable

( S9 )K4: Operating the manipulated variable

(S11)K5: Precautions (S1/S3 )

S1 A leafy shoot is cut under water and thecut end is kept in the water.

S2 The capillary tube and rubber tubing arefilled with water and the leafy shoot isinserted into the rubber tubing.

S3- The leaves are wipe dry and someVaseline is put around the each ends of rubber tubing to make it air tight.

S4 The photometer is placed in a beaker of water at the room temperature for 5minutes to allow water to move up thecapillary tube.

S5 A section of the capillary tube is marked A and B, a distance of 5cm.

S6 The capillary tube is lifted from thebeaker and the rubber tubing is pressedgently to squeeze out a drop of water fromthe capillary to trap an air bubble in thetube..

S7 The capillary tube is placed back into thebeaker of water and kept upright using theretort stand.

S8- The potometer is placed under slow speedof fan for 10minutes .

S9- The time taken for the air bubble to movefrom A to B is recorded by using thestopwatch.

S10-Step 5 to 8 is repeated twice to get theaverage.

K1+K2+K3+K4+K5 (5 K) = 3marks

3 to 4 K=2 marks

2 K only =1 mark

1 K = 0 mark but


10/10

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S11- The experiment is repeated under medium and strong speed of fan.

S12- The results are recorded in the table.S13- The rate of transpiration is calculated.

8.RECORDINGDATA/RESULT (RD)

Able to construct a table to record all data withthe following aspects:1. At least 2 titles (MV and RV) and unit2. NO data is required

REFER BELOW FOR SAMPLE TABLE

B 2 = 1 mark for right units

9.CONCLUSION (Cn)

The fastest speed of air movement, therate of transpiration increase.

No mark just a T ICK

10.PLANNINGEXPERIMENT

03

7 9 T ICKS = 3 marks4 6 T ICKS = 2 marks2 3 T ICKS = 1 mark

Wind speed of fan or condition of air movement.

Readings (min or s) Rate of transpiration

cmmin - or mms -

First Second Third Average

Slow

MediumFast

E ND OF T HE M A RK S CHEME

Mark scheme P3 Melaka (SPM)

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