Posts Tagged ‘circulatory system’

Transport system

Tuesday, September 22nd, 2009

Here is a really useful presentation, thanks to Mr Hobbins. How your Heart beats

Please also continue to work on your heart rate labs.  See the rubric below.  Due on OCTOBER 1st.

Listed below are some of the finer points that are often the difference between a ‘c’ and a ’p’ grade in an aspect. You should be able to answer ‘yes’ to each of the questions.

Planning A Is your research question sufficiently focused?Have you made a quantitative prediction in your hypothesis?Have you fully explained your hypothesis?Are your variables clearly shown i.e. not just one word?
Planning B Have you included the volumes and concentrations of solutions used, sizes of glassware etc?Are all of your controlled variables covered?Do you plan to do enough runs?Have you included a clearly labeled diagram?
Data Collection Is raw data neatly presented in a table?Does the table have an uncertainty and unit value in the header row?Have you made qualitative observations too e.g colour changes?Are your significant figures/decimal places consistent?
Data Processing and Presentation If you have plotted a graph, have you labeled axes and drawn a line of best fit to extract more information?Have you processed the uncertainty due to the equipment and shown this in your final answer (HL)?Have you commented on the uncertainties of the equipment and how significant they might be in affecting the reliability of your result (SL)?
Conclusion and Evaluation Have you compared the result with literature data?Does the percentage uncertainty cover your percentage error (HL)?Have you identified flaws in the technique and suggested ways to improve them (N.B. ‘I ran out of time’ is not suitable)?
General Is every detail of the write up your own work?Have you written in the passive voice?Have you referenced any sources?


DP Biology Lab Report Format


Please follow this format for each practical investigation – it will help us see that you have covered all of the aspects that are needed to be marked ‘Complete’.

1. Research question or aim:  Clear and to the point. State the dependent and independent variables and species name [e.g. Apis mellifera] in the research question

2. Hypothesis: Predictions with reasons based on scientific theory or published data. What do you think is going to happen with reasons based on scientific theory or published data. This is then stated as a prediction as what you think will happen in your experiment. IF (independent variable) THEN (dependent variable) BECAUSE..”

3. Variables: Independent, Dependent, Controlled (a list here is enough).

4. List apparatus and materials (with amounts/sizes/quantities).

5. Method to control variables: Keep at least 3 factors constant to reduce experimental error.  Give a reason for each one.

6. Method for collection of raw data: What are you changing? How? What are you measuring? How? What units? How many data points will you produce? State them clearly. What will you do with the data collected?

7. Large, clear diagram or photo of set-up, clearly labeled.

8. Collect and record raw data, giving units and uncertainties.  e.g. using a mm ruler, error is +/- 1mm

9. Present the raw data in a large, clear, self-designed table. Give an informative title.  i.e. – ‘table of results’ is not descriptive enough.

10. Process raw data: Choose an appropriate graph/ chart/ statistical test.  Perform it correctly, giving a worked example for all calculations used.

11. Present processed data: Make table or graph large, clear and well labeled.  Include units and an informative title.

12. Draw conclusions: What do your results tell you?  What does this mean? Explain using scientific theory.  Does it agree with your hypothesis?  Compare collected data with published (literature) data if possible. Reference it appropriately.

13. Evaluate procedures and results: Identify (min 3) weaknesses, limitations and errors in the results and the method.

14. Improve the investigation: Suggest realistic methods to improve on each of the weaknesses mentioned above.

15. References.

Be still my beating heart

Tuesday, September 1st, 2009
maximum heart rate 214 by Laurel Fan on flickr

maximum heart rate 214 by Laurel Fan on flickr

In class this week and next we will be working on a lab dealing with factors affecting heart rate.  Your task is simple – to design, carry out and write up your findings on how a particular factor affects heart rate. 

Begin by listing all the factors you can think of that might influence how fast or slow your heart beats.  Decide on one independent variable to test, and write it in the form of a research question.  Next write a hypothesis, including justification.  Then plan an experiment to test your hypothesis, remembering to state clearly how you will control all the variables you mentioned earlier. 

Then comes the fun part – performing your plan.  You may need to ask, beg, bribe some of your classmates or family members to participate.  Once you have your data, process it and present it appropriately, explain your findings, and evaluate both your results and your method.  Suggest improvements for next time. 

Phew!  That should take a while…. This is a great opportunity for you to boost your IA scores and gain complete on the various aspects of lab grading.  Here is the  IA rubric.