Download - 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
0Not able to give any response or wrong response
(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
0Not able to give any response or wrong response
(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
0Not able to give any response or wrong response
(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
0Not able to give any response or wrong response
(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
0Not able to give any response or wrong response
(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
0Not able to give any response or wrong response
(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
0Not able to give response or wrong response
// 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.
0Not able to give response or wrong response
(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
0Not able to give response or wrong response
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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