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Incredibly useful resource site - has probably saved me hundreds of hours planning. Plenty of links, worksheets and interactive resources that support the new IB course.

Sarah Jackson, Diocesan School for Girls, New Zealand

This year is my first year teaching IB Biology. The InThinking Biology site has proven to be immensely valuable to the quality and delivery of my lessons.

Karin Hartog, D Y Patil International School, Belgium

These InThinking Biology activities are excellent! I was looking for something to break the monotony of a cells lesson so I tried the Cell types detective activity. Students loved it. Both the situation and the examples were brilliant

Amit Khanna, Jakarta Intercultural School, Indonesia

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A fire breathing monster in the immune system?

3 March 2019

A new therapy which strengthens the power of a patient’s immune system to attack tumours is curing people of cancer. It is an exciting and... more

Biology is everywhere, can't you see it?

15 December 2018

When students say that they don't have any idea what they would like to investigate for their Individual investigation, I'm surprised. "What... more

Subscriber comments


  • 22 Mar Peter Marier
    Nitrogen cycle - applications
    Hello, I would also like to know if there will be model answers for this topic. Thank you
  • Brenda Winning is correct, I also get 8.947 for the first row of table 1.
  • Hi David, I have a student who wants to investigate the effect of penicillin on bacterial growth. I know that this is possible, but following your course I had thought that the IB were funny about using antibiotics due to the possibilities...
  • 18 Mar Matthew Monaghan
    Gene linkage 2 - model answers
    Hi David. Very useful/interesting to read your answers here. If you have time to complete this is would be very useful. Many thanks.
  • also quite a few spelling mistakes, can we edit?
  • no choices for students to select on last question?
  • 17 Mar David Faure
    DNA Replication
    Thanks Rajaa for posting the link in your comment. I have checked the link on the page which is working. Best wishes, David
  • 16 Mar David Faure
    Classification games
    Dear Victoria, Thanks very much for your comment and for sharing a great idea. Best wishes, David
  • Hi David IF the answers of the Option D revision sheet available? Thanks!
  • 12 Mar Gertrud Cigen
    Ecology mini-investigation
    That we need many repeats is ok. But why is it that, again, in this example they say we have to have 5 values, but they never provide us we any statiscal examples how to calculate them or even using it in the examples given. Here (again) there...
  • 12 Mar Gayatri Kammara
    Extended Essays - overview
    Thank you Mr. David for your valuable feedback
  • 11 Mar victoria seymour
    Classification games
    another game option I tried with the cards was "Guess Who" - both students have a full set of cards and they ask questions to eliminate until they identify the correct species