DARRELL DULALCHAN CSEC BIOLOGY MARK SCHEME 2020-2020
O/R/R SKILL
ORR SKILL
LAB #7 - To determine the effect of exercise on blood pressure (bpm) and pulse rate.
• Recording of Data
• Recorded an increase blood pressure and pulse rate value immediately
after exercise. (1 mark)
• Recorded a gradual decrease in blood pressure and pulse rate value after exercise when
put to rest. (1 mark)
Maximum (2 marks)
• Graph of results
• Accurate points plotted
5 or more (2 marks)
3 or more (1 marks)
2 or less (0 marks)
-Proper Title (1 mark)
- Correctly Labelled axes (x and y) (1 mark)
- Independent variable on y axis (1 mark)
- Correct Scale present (1 mark)
Maximum (6 marks)
• Language and Expression
No more than 2 grammatical errors in discussion (2 marks)
No more than 3 grammatical errors in discussion (1 mark)
Maximum (2 marks)
TOTAL 10 MARKS
ORR SKILL
LAB #18 – Temperature Control
• Recording of Data
- Decreasing trend in recorded temperatures for each flask A, B and C (1mark)
- Initial reading of temperature of thermometer recorded at 0 minutes initially and after at 5
min intervals for 30 minutes. (1 mark)
Maximum (2 marks)
• Graph of results
• Accurate points plotted
6 or more (2 marks)
3 or more (1 marks)
3 or less (0 marks)
-Proper Title (1 mark)
- Correctly Labelled axes (x and y) (1 mark)
- Independent variable on y axis (1 mark)
- Correct Scale present (1 mark)
Maximum (6 marks)
• Language and Expression
No more than 2 grammatical errors in discussion (2 marks)
No more than 3 grammatical errors in discussion (1 mark)
Maximum (2 marks)
TOTAL 10 MARKS
DRAWING SKILL
LAB #19 – Food Storage Organs
• Accuracy- Should be proportional/ reasonable (1mk)
- Faithfulness of reproduction (1mk)
- Structures typical of specimen (1mk)
(3mks)
• Clarity - Clear continuous lines of even thickness
and intensity (1mk)
- Reasonable size(more than half page) (1mk)
(2mks)
• Labelling- Use a pencil and ruler to draw straight lines
which must not cross and are parallel to
each other
- No arrowheads. Line should touch the
structure to be labeled and labels must be justified (1mk)
(1mk)
• Labels - Must be correct and printed next to label lines (1mk)
(1mk)
• Annotations - must be present for each label (1mk)
(1mk)
• Magnification- Calculations must be shown close to the drawing(1mk)
(1mk)
• Title – must be below drawing, all capitals, underlined and must
include the view and magnification (1mk)
(1mk)
TOTAL 10 MARKS
PLAN AND DESIGN SKILL
LAB # 20 – Response of plants to stimulus of light.
• Hypothesis
-clearly stated
(1mark)
• Aim
-clearly stated (1mark)
• Materials and Apparatus –
- appropriate (1mark)
• Method
-suitable method (1mark)
• Variables
-Manipulated variable stated (1mark)
At least one controlled variable stated (1 mark)
- Responding variable stated (1mark)
• Expected Results
- Proper method of representing expected results (1mark)
• Treatment of results
- Statement of conditions whereby hypothesis is accepted / rejected (1mark)
• Assumptions/ Precautions/Possible Sources of Errors
- Any one stated (1mark)
TOTAL 10 MARKS
ANALYSIS AND INTERPRETATION SKILL
LAB#18
HEAT LOSS UNDER DIFFERENT CONDITIONS
CRITERIA MARKS
Background information-
Explain the purpose of towel wrapped around flask A and relate to 1
hair/clothing/fur/feathers
Explain the purpose of methylated spirit swabbed on flask B and relate 1
evaporation of alcohol to sweat on skin
Explain purpose of untreated flask C (control) and relate to human losing heat 1
in normal conditions.
Trends-
Temperature in all three flasks decreased 1
Flask B lost more heat than flasks A and C 1
Explain why flask B lost the most heat and why flask A lost the least 1
Use of figures from results in explanation of trends 1
Precautions (1)- well explained 1
Limitations/Sources of error (1)- well explained 1
Conclusion-
Relates to Aim 1
TOTAL 10
MARKS
MANIPULATION AND MEASUREMENT LABS
LAB # 5
1. FOOD TESTS
CRITERIA MARKS
USE OF SYRINGE-
no air bubbles present 1
bottom of meniscus read at eye level and upright 1
USE OF DROPPER-
Squeeze top before inserting into liquid 1
Ensure that tip of dropper is inserted completely in liquid to avoid 1
air bubbles
1
USE OF MEASURING CYLINDER-
cylinder must be rested on flat even surface 1
meniscus read at eye level 1
Bottom of meniscus read 1
Correct volume read off 1
USE OF A WATER BATH-
Bunsen burner, tripod and gauze assembled properly 1
Light match immediately before turning on gas 1
Test tubes placed in water bath facing away from students 1
TOTAL 10
MARKS
MANIPULATION AND MEASUREMENT
LAB # 21
2. WATER HOLDING CAPACITY OF SOIL
CRITERIA MARKS
USE OF MEASURING CYLINDER-
cylinder must be rested on flat even surface 1
meniscus read at eye level 1
Bottom of meniscus read 1
scale accurately read 1
USE OF FILTER PAPER-
Correct folding of filter paper 1
Placement of filter paper into funnel using water 1
Ensure that water is poured slowly to prevent overflow of filter 1
paper
USE OF ELECTRONIC BALANCE
Cleaning Balance of any debris before measurements are taken 1
Ensure balanced is zeroed ( TARE) before measuring mass of soil 1
Ensure that final reading is taken when readings stop fluctuating 1
TOTAL 10
MARKS
