Science 30 January 1999 Grade 12 Diploma Examination
Science 30 January 1999 Grade 12 Diploma Examination Science 30 January 1999 Grade 12 Diploma Examination
Scoring Guide – Short Answer January 1999 Diploma ExaminationScore4StandardofExcellence32AcceptableStandardScoring DescriptionsThe response reflects an accurate understanding of the titration procedure. Thesteps and equipment used are appropriate.The response reflects an adequate understanding of the titration procedure. Thesteps and equipment apply to the titration procedure.The response reflects a sketchy understanding of the titration procedure. The stepsand equipment generally apply to titration procedure.The response reflects a poor understanding of the titration procedure. The stepsand equipment do not apply to titration procedure.10 The response does not address any of the major points of the question at anappropriate level for a 30-level course.Sample Answer – Short AnswerRinse a buret with water, then with the strong base. Put some base in the buret and recordthe initial volume.Add an indicator (bromothymol blue) to 10 mL of acid.Carefully add the base to the acid until the indicator changes colour.Record the final volume on the buret and subtract the initial volume.Rinse the buret and other containers with water.
Scoring Guide – Long Answer 1 January 1999Diploma ExaminationSCORE4Standard ofExcellence32AcceptableStandard10NRSCORING DESCRIPTIONSThe response is complete, well organized, and reflects thorough understanding andlogical consistency of thought. The list of mechanisms for the control of bloodpressure and identification of variables is correct. Interpretations of the graphs areinsightful. Measures to improve the experimental design are imaginative andrealistic.The response is mostly complete, organized, and reflects correct understanding.The list of mechanisms for the control of blood pressure and identification of variablesis correct. Interpretations of the graphs are mostly correct. Measures to improve theexperimental design are complete and realistic.The response is organized, and is generally logical and consistent . The list ofmechanisms for the control of blood pressure and identification of variables is mostlycorrect. Interpretations of the graphs are generally correct. Measures to improve theexperimental design are realistic.The response is incomplete, disorganized, and reflects poor understanding. Thelist of mechanisms for the control of blood pressure and identification of variables isincomplete. Interpretations of the graphs are poorly described. Measures to improvethe experimental design are unrealistic.The response does not address any of the major points of the question at an appropriatelevel for a 30-level course.No response.Sample Answer – Long Answer 1A. Blood pressure is controlled by the amount of blood returning to the right atrium ofthe heart and by the stretch receptors in the aorta. Lots of blood coming into the heartcauses the heart squeeze harder, raising the BP. If the stretch receptors in the aortaare stretched a lot, signals are sent to decrease the strength of the heart contractions.B. The manipulated variable is the amount of exercise the people do. The respondingvariable is the blood pressure after exercise.C. The graph supports the idea that people who exercise regularly will have less of a BPincrease after exercising than for people who don’t exercise regularly. Theexperiment has too small of a sample size. Other factors such as gender, size, weightetc. could be factors that affect blood pressure. Different amounts of exercise anddifferent ages of people could also have been tested.
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Scoring Guide – Long Answer 1 <strong>January</strong> <strong>1999</strong><strong>Diploma</strong> <strong>Examination</strong>SCORE4Standard ofExcellence32AcceptableStandard10NRSCORING DESCRIPTIONSThe response is complete, well organized, and reflects thorough understanding andlogical consistency of thought. The list of mechanisms for the control of bloodpressure and identification of variables is correct. Interpretations of the graphs areinsightful. Measures to improve the experimental design are imaginative andrealistic.The response is mostly complete, organized, and reflects correct understanding.The list of mechanisms for the control of blood pressure and identification of variablesis correct. Interpretations of the graphs are mostly correct. Measures to improve theexperimental design are complete and realistic.The response is organized, and is generally logical and consistent . The list ofmechanisms for the control of blood pressure and identification of variables is mostlycorrect. Interpretations of the graphs are generally correct. Measures to improve theexperimental design are realistic.The response is incomplete, disorganized, and reflects poor understanding. Thelist of mechanisms for the control of blood pressure and identification of variables isincomplete. Interpretations of the graphs are poorly described. Measures to improvethe experimental design are unrealistic.The response does not address any of the major points of the question at an appropriatelevel for a <strong>30</strong>-level course.No response.Sample Answer – Long Answer 1A. Blood pressure is controlled by the amount of blood returning to the right atrium ofthe heart and by the stretch receptors in the aorta. Lots of blood coming into the heartcauses the heart squeeze harder, raising the BP. If the stretch receptors in the aortaare stretched a lot, signals are sent to decrease the strength of the heart contractions.B. The manipulated variable is the amount of exercise the people do. The respondingvariable is the blood pressure after exercise.C. The graph supports the idea that people who exercise regularly will have less of a BPincrease after exercising than for people who don’t exercise regularly. Theexperiment has too small of a sample size. Other factors such as gender, size, weightetc. could be factors that affect blood pressure. Different amounts of exercise anddifferent ages of people could also have been tested.
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