93763109-scheme-bio-paper-3-2011.doc

Suggested answer for paper 3

Suggested answer for paper 3

Question 1

ITEM NOSCOREEXPLANATIONREMARKS

(a)KB0603 Measuring using numbers

3

Able to record all three data correctly

Sample answer :

Temperature 0CThe final distance travelled by air bubble after 5 minutes / mm204030554090

2Able to record 2 data correctly

1Able to record 1 data correctly

0Not able to give any response or wrong response

(b) (i)

(b) (ii)

KB0601 ObservingAccepted :

Any suitable answer

3Able to state any two observations correctly

Sample answer :

1. At temperature 20 0C, the final distance travelled by air bubble after 5 minutes is 40mm.2. At temperature 30 0C, the final distance travelled by air bubble after 5 minutes is 55mm.

3. At temperature 40 0C, , the final distance travelled by air bubble after 5 minutes is 90mm.

2Able to state any one correct observation and one idea of observation or two inaccurate observations

Sample answer:

1. At temperature 20 0C, the final distance travelled by air bubble after 5 minutes is low

2. At temperature 30 0C, of meniscus in tube X of photometer after 5 minutes is the high3. At temperature 40 0C final distance travelled by air bubble after 5 minutes is the highest

1Able to state two ideas of the above observations correctly

Sample answer:

1.the final distance traveled by air bubble is low/ high


(b) (ii)KB0604 Making inference

3Able to state one possible inference for each observation

Sample answer

1. At temperature 20 0C, water loss from the leaves is low causing the transpiration to be low.2. At temperature 40 0C, the loss of water from the leaves is high causing transpiration to be high.

2Able to state one correct inference and one inaccurate inference or two inaccurate inferences

Sample answer

1. At temperature 20 0C, water loss from the leaves is low // transpiration is low.2. At temperature 40 0C, the loss of water from the leaves is high // transpiration is high.

1Able to state two inferences at idea level

Sample answer

1. The transpiration is affected by temperature


(c)KB0610 Controlling variables

3

Able to state any 5-6 items from the table

Variable

Method to handle the variable

Manipulated variable:

Temperature

Used different temperatures in this experiment

//Change the temperature from 200C to 300C and 400C.

Responding variable:

The final distance traveled by air bubble after 5 minutes

// Rate of transpiration

Record the final distance travelled by air bubble by using a ruler

//calculate the rate of transpiration by using formula:

= distance travelled by

air bubble

5

Constant variable:

Type of plant shoot

//

Fixed the same type of plant shoot.

2Able to state any 3-4 items from above

1Able to state 2 items from above


(d)

KB0611 Stating a hypothesis

3Able to write a complete hypothesis statement based on the following criteria :

P1 : manipulated variable = temperature

P2 : responding variable = location of meniscus in tube x /

final position of meniscus

H : Relationship / LinkSample answer :

1. The higher the temperature, the higher the final distance travelled by air bubble after 5 minutes

2Able to relate the hypothesis based on any P with relationship

P1 and P2// P1 and H // P2 and HSample answer;

The final distance travelled by air bubble increases with temperature

1Able to relate hypothesis at idea levelSample answer:

The final distance of air bubble is affected by temperature


(e)(i)KB0606: Communicating

3

Able to draw a table and show 3 correct criteria:P Heading in the table are labelled with correct units

S All data are correct

D The correct calculation of rate of transpirationSample answer:

Temperature/ 0C

The final distance travelled by air bubble after 5 minutes/ mm

Rate of transpiration /

mm min-120

30

40

40

55

90

8.0

11.0

18.0

2Able to draw a table with any 2 of the above criteria

1Able to draw a table with any 1 of the above criteria


(e)(ii)KB0607 Using spatial and time relationship

3Able to plot a graph with the following criteria:P all axis with uniform scale and correct units

T all point is transferred correctly

B smooth graph was plotted

2Able to give any two criteria

1Able to give any one criteria


(f)KB0608 Interpreting Data

3Able to explain the relationship between the rate of transpiration and the temperature.

Sample answer:

E1 As temperature increases, the higher the rate of

transpiration

E1 because more water evaporates from the leaves

E3 causing more water loss / more water being absorbs by roots / transported in plant.

2Able to write any two from the above

E1 and E2 // E1 and E3 // E2 and E3

1Able to write any one from the above

E1 // E2 //E3

0Not able to give response or wrong response

(g)KB0605 Predicting

3Able to predict and explain the distance travelled by air bubble correctly:Sample answer

F the distance travelled by air bubble decrease / less

E1 less/ lower than 18 mm min-1

E2- because less water evaporates / loss from the leaves

// because the air / surrounding is dry.

2Able to predict on any 2 criteria correctly based :

F and E1 // F and E2

1Able to predict any 1 criteria correctly:

F only


// E1 or E2

(h)KB0609 Defining by operation

3Able to describe the concept of transpiration based on the following criteria / 3 criteria correctly:Sample answer:

E1 process occurring at the leaves of plant shoot

E2 determined by the final distance travelled by air bubble at

potometer

E3 and the rate of transpiration / water loss is affected by

temperature

2Able to describe the concept of transpiration based on any 2 criteria correctly .

1Able to describe the concept of transpiration based on any 1 criteria correctly.


(i)KB0602 Classifying

3Able to classify 5 morphological factors and 3 environmental factors correctly:Sample answer:

Morphological factor

Environmental factor

Place for stoma

Wax cuticle

Size of leaf

Curld leaf

Number of leaves

Light intensity

Air movement

Humidity

2Able to classify 3-4 morphological factors and 3 environmental factors correctly

1Able to classify 1-2 morphological factors and 1-2 environmental factors correctly


SUGGESTED ANSWER FOR QUESTION 2

Particulars

ExplanationScore

1. Identifying problem

(KB061201)

KOD: 01

Able to write a complete and correct problem statement based on the following criteria:

P1: Manipulated variable :

different quantities of water intake //

volume of water intake / drank.

P2: Responding variable

volume of urine output / formation

H: Link/ statement in the form of

question.

3

1. Identifying problem

(KB061201) KOD: 01Sample answer:

1. Do the different quantities of water

intake affect the volume of urine

formation/ urine output?

2. How does the volume of water intake/

drank affects the volume of urine output?

3

Able to identify problem but incomplete or any two criteria from the above.

Sample answer:

1. Do the different quantities of water

affects the different volume of urine?

2. How does the volume of water intake

affects the urine output?

2

Able to give idea on identifying the problem or any one criteria from the above.

Sample answer:

1. The amount / volume of urine output /

formation are different.

2. Urine produced is affected by water.

1

2. Variables KOD: 02

Manipulated variable:

Responding variable:Controlled variable:

Able to give three correct variables.(Different) quantities / volume of water intake / drank.

Volume of urine output / formation

The same student/ same gender

1

1

1TOTAL

3 MARKS

3. Statement of

Hypothesis

(KB061202)

KOD: 03Able to state the hypothesis which relate the manipulated variable with the responding variable correctly.

P1: state the manipulated variable

P2: state the responding variable

H : Showing the right relationship between P1 and P2.

Sample answer:

1. As more water intake is taken by a

student, the higher the volume of

urine output/ formation.

2. The higher the volume of water intake /

drank, the higher the volume of urine

output / formation / vice versa

3

Has P1,P2 and H

Able to state the hypothesis which relate any two of the above criteria:

Sample answer:

1. The volume of water intake/ drank affects the volume of urine output / formation.

2

Able to give idea on the hypothesis .

Sample answer:

1. The volume of urine output/ formation

is different.

1

4. List of Apparatus

and materials

(KB061205)

KOD: 04Able to list out all the apparatus and materials used.

Apparatus:

Measuring cylinder

Beakers/ containers

Stop-watch

Tissue paper

Fan / air condition room

Materials:

Drinking water ( different quantities), student 5A + 2M = 3m

3-4A + 2M = 2m

1-2A + 2M =1m

5. Procedures

(PC)

(KB061204)KOD: 05Able to describe all / 5 steps below:

Steps in the experiment:

P1. 200 ml of drinking water are

prepared (k1a)

P2. One student(k2) is chosen as a

sample study to drink the water. (k1b)

P3. First the student must empties his

urinary bladder. (k1c / k5)

P3. Then, give he/she to drinks 200ml of

drinking water. (k1d)

P4. He/ she is let to rest/ stays in the Biology laboratory under the fan /

in an air condition room

for 30 minutes (k1e)

P5. Then he/she is asked to urinate in the

Toilet (k1f)

P6. The volume of urine output are

collected, measured using

a measuring cylinder and recorded. (k3)

P7. After another 30 minutes, the student goes to urinate again and the volume of the two urination are added and

average volume are recorded.

(k3b/ k5)

P8. The experiment is repeated using

300 ml, 400 ml and 500 ml of drinking Water (k4)

P9. Hands should always be clean, during

this experiment (k5)

All 5Ks correct = 3.

Any 3-4 Ks = 2

Any 2ks = 1

Note ;K1= 4 examplesK2-k5 only one example

6. Presentation

Of DataKOD: 06

Able to tabulate the following correctly based on the following criteria:

T : Title with units

S : List of water samples

Volume of drinking water (ml)

Volume of Urine output/ formation ( ml)

12Average200

300

400

500

T and S = 2mT/S = 1mGot 1 mark if there is manipulated variable and 1 mark for responding variable.

END OF THE MARK SCHEME

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93763109-scheme-bio-paper-3-2011.doc

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