Activities
Activity 1 - Species & chromosomes - model answers
This page shows suggestions of model answers for the Species and chromosomes - IB-style questions. on the page Species & their karyograms (2025) These are suggestions, model answers and other wordings...
Assessment - introduction
The Investigation Free
Students are required to submit one investigation for internal assessment. It is hoped that the introduction of new assessment criteria using mark bands and a best-fit approach will make the assessment...
Assessment - introduction
IA - First examiner's report
There are three important sources of information provided by the IB for Biology teachers supervising and marking Internal Assessment: The first examiners report has just been released in the Programme...
eBook
D4.1 Natural selection - written task
This structured extension question is in the style of the IB exam questions. It has a particular focus on the concept of natural selection, in particular the ideas of intraspecific competition, selection...
Activities
Species concepts - model answers
This page shows suggestions of model answers for the activities on the SL activities page Species & binomial names (2025) These are suggestions, not mark schemes, and many other wordings are also correct...
Activities
Species & binomial names (2025)
Students will learn about the origins of the binomial nomenclature. There are introductory slides and then an activity to compare the morphological species concepts with the biological species concept....
eBook
D1.3 Commercial genetic tests - reading activity
This activity contains interesting information about commercial genetic tests that covers the Nature Of Science details about how genetic tests can yield information about potential future health and...
Activities
Invasive species (2025)
Two short videos introduce students to the problem os invasive species and the cane toad in particular. In a second activity students identify the essential qualities of a species for it to become invasive...
Blog
First examiner's report on IA Free
There are three important sources of information provided by the IB for Biology teachers supervising and marking Internal Assessment: The first examiners report has just been released in the Programme...
Activities
Sexual selection - model answers
These are suggested model answers for in the student sheet Sexual selection - examples on the page Sexual selection examples (2025). As model answers they don't cover all the possible options for correct...