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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

If you are looking for a reliable source to help you plan and teach the new IBDP Biology course, this website is a must.

Mandy Watson, Berlin International School, Germany

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

 Blogmore

Reflex arc - playground model

15 September 2017

Walking along a neurone and passing chemicals (sweets) to the next neurone could be a great way to illustrate the reflex arc with IB students. more

Using a database in Individual Investigations

31 August 2017

It's hard to persuade students that it might be a good ideas to use a database for their investigation. Stuents have lots of experience of... more

Backchannel collaborations

8 August 2017

We all know it is a good idea for students to come to our lessons prepared to participate and share their ideas. The best learning occurs when... more

Subscriber comments


  • 21 Nov Tammy McChristie
    Hormones introduction
    Apologies but I cannot see the four selected web pages? Thank you.
  • can you please post the answers, thank you
  • 19 Nov Brendan Rainford
    Dietary fats and BMI
    One of the websites in activity two has moved to -
  • 19 Nov Maria Karaveli
    Mitosis and the Cell Cycle
    Dear David, do you have the answers to the "histology of cancer in the digestive system" worksheet?
  • Dear David, Thank you for your input, my student decided to change their IA to look at the relationship between pollution and chlorophyll content in a local species.
  • 16 Nov Maria Karaveli
    Mitotic index - model answers
    David, according to the virtual lab I did, along with 15 students, gave us different results for the second question. The ovarian cancer sample had the highest mitotic index and the lung cancer cells show the greatest increase in mitotic index,...
  • 16 Nov Jenny Jiang
    Analysis
    Hi David, For Osmosis experiments, other than calculating percent change in mass, do you recommend any other statistical tests as part of data analysis? Thanks, Jenny
  • 15 Nov Lindsay Langworthy
    Properties of Water.
    The extension Icon is not working please can you help. Kind regards Lindsay
  • 15 Nov Maria Karaveli
    Visualising molecules model answers
    Dear David, in question 7, do you mean to say "which of these molecules resembles glycerol or cholesterol"?
  • Hi David, I can't get the links for Activity 3 and 4 worksheets to work, both take me to the Inthinking home page. Thanks so much for all the resources! Kim
  • 14 Nov Kamran Malik
    DNA structure - Extras for HL
    Still cannot see Activity 3 - could you fix the link? Thanks
  • 13 Nov David Faure
    Extracting DNA Experiment.
    Dear Aasma and Veronica, I have repaired the links and added a new one for tomato DNA, which uses a slightly different method including an 'extraction buffer'. Best wishes, David