Rouba Thank you for this, it will be corrected.
Eukarotic cell IB style qns - model answersLast question uses the command term compare which is supposed to mean only similarities. The model answer is showing differences.
Eukarotic cell IB style qns - model answersCharlie, Thanks for this. I do not find either rise or decrease really useful in describing pH but it is often stated like this in IB exams, in the sense that CO2 wil cause a rise in the number value of pH. My own preference would be more or...
C3.1 Integration of body systems - topic testFor question #7, shouldn't it be "decrease" instead of "rise" in blood pH?
C3.1 Integration of body systems - topic testI really like the herd immunity activities - they are very accessible for understanding the concept. Can something be done to improve the COVID-19 data analysis task? There are multiple problems: the y axis is missing and there are no tick marks...
COVID-19 pandemic (2025)Thank you David.
The InvestigationDear Madhuchhanda, We have two rubrics which breakdown the criteria to help with marking.You can see them on this page IA...
The InvestigationThank you, David. It works perfectly now. Best,
Modelling energy with pyramid diagrams (2025)Dear Corinne, Thanks for the reminder, I have repaired the link on this page. Of course, the model answers pages can also be found in the left hand list of topic tests and answers. Best wishes, David
B2.3 Cell specialization - topic test
Rochelle
Lower pH levels are more acidic - increase CO2 concentration decreases pH
C3.1 Integration of body systems - topic test