Posts Tagged ‘transport’

Transport in plants

Thursday, March 17th, 2011

Cactus series by PVCG on flickr

Here is Mr Taylor’s presentation on this topic.  Transport in angiospermophytes

  • How do water and mineral ions enter a plant?
  • How does water move upwards, against gravity, in a plant stem?
  • What is transpiration and what are the factors that affect it?
  • How are plants adapted for particularly dry or wet environments?

We will also set up a lab to investigate which surface of a leaf transpires the most, and learn what a potometer is and how to use it.

Systems performance task

Sunday, November 7th, 2010

You will try and put together much of the ideas we have been learning over the past months with this assignment.  You will choose one of the following systems to design:

  • Design a system to transport mangoes from the Philippines to France.
  • Design a system to detect typhoons/earthquakes/ tsunamis etc, and warn people.
  • Design a system to lift an injured elephant from the ground onto a truck (1.5m high).
  • Design a system to help a person with diabetes maintain a constant sugar level in their blood.

You make work alone or with a partner.  Start by reading this rubric:  Rubric for systems performance task

H5 Transport system

Monday, April 12th, 2010
Cardiac_cycle_pressure_only from wikimedia

Cardiac_cycle_pressure_only from wikimedia

Take another look at your notes on blood, blood vessels and the heart from topic 6.  Re-learn your heart diagram.  There is some new vocab to get your head around in this section.  I have highlighted these terms below.  Use this presentation to help you.


  • Explain the events of the cardiac cycle. [Talk about atrial and ventricular systole and diastole, and heart sounds]
  • Analyse data showing pressure and volume changes in the left atrium, left ventricle and aorta during the cardiac cycle.
  • Outline the mechanisms that control heartbeat. [Include role of sinoatrial (SA) node, atrioventricular (AV) node and conducting fibres in the ventricular walls]
  • Outline atherosclerosis and the causes of coronary thrombosis.
  • Discuss factors that affect the incidence of CHD (coronary heart disease).

Testing, testing, 1 2 3

Thursday, September 10th, 2009


Block B will have their test on Topics 6.1 Digestion and 6.2 Transport System on THURSDAY 17th SEPTEMBERBlock F will have theirs on WEDNESDAY 16th SEPTEMBER.  Usual format – part multiple choice, part short answers – all from past IB papers.

COME TO TUTORIALS if you need help with anything.

Checklist for heart rate lab

Thursday, September 10th, 2009

Use this checklist, thanks to Mr. Hobbins, to help you with your heart rate lab.

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.

If I only had a heart….

Thursday, September 10th, 2009

Get ready – heart dissection on Tues 15th Sept.  Check out this presentation and this site with useful info on this topic.

For all you budding surgeons out there, try this virtual heart transplant.

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.

Transport system

Tuesday, August 25th, 2009
heart dissection by Biology Big Brother on flickr

heart dissection by Biology Big Brother on flickr

Here is another excellent presentation from the site on the topic of transport.  I recommend you find some time to take a look at it this week. 

We will be doing a heart dissection during the 3rd lesson on this unit.