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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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Evolution debate links IB Biology concepts

2 August 2019

In recent years a debate about standard evolutionary theory has taken place amongst Biologists. Any sign of disagreement among scientists can... more

Guiding students from plagiarism to research

2 May 2019

Sometimes a student will find an experiment online which is very similar to their own IA. They think this is a disaster, they are trying to... more

Subscriber comments


  • Watch this animation of how enzymes lower the activation energy (select the "Overview"). Is there another option for this if the download is not supported?
  • 13 Aug Nikki Zimmerman
    Ethology HL - planning sheet A.6
    Hi David - also looking forward to these resources. I love your work - you are a life saver! Thank you
  • Hi there, Are any resources for this section likely to come soon? (I can only see the planning sheet)
  • Thank you David for your guidance. She is now planning to do effect of color of light on cynobacteria's rate of photosynthesis. Will discuss with her , both the possibilities now
  • Dear Divya, I think the topic is great, but the student will probably need guiding in the identification of a variable to measure. I could imagine a student using plants to remove nitrates from aquarium water, and the level of nitrates could...
  • Hi David, One of my HL student wish to do her IA on bio-remediation. I am not able to find any accurate measure to quantify the rate of bio-remediation in lab. Can you please suggest if the topic is fine and any method to do so. Regards Divya
  • 23 Jul David Faure
    Enhanced Greenhouse Effect.
    Dear Kirsten, Thanks for your reminder. I have replaced the link to the Norwegian center for Science education, with a short video from NASA and an animation from the Koshland Science Museum. I've added a third activity so that students can...
  • Hi Kirsten, Sorry for the delay. I can't replicate the problem, the answers are clearly visible on my computer, and on my phone. Could it be related to your pdf reader or its fonts? Best wishes, David
  • Dear Sangeeta, These pages are on my to do list, over the next few weeks. Watch this space. Thanks for your patience, David
  • 23 Jul David Faure
    Lactose Intolerance
    Dear Volkan, I think this might be the same problem, could your browser be blocking embedded content. Usually there is a little triangle warning, or a circle with an i in it, which appears in the 'address bar' of the browser. If you click...
  • Dear Volkan, The animation which the link points to is a flash animation. Could your browser be blocking embedded content? I've just tested the link and it worked fine. Best wishes, David
  • 23 Jul David Faure
    Extended Essays - overview
    Hi Yingying, The IB Animal experimentation guidelines say that, "No experimentation should result in any cruelty to any animal—vertebrate or invertebrate. Therefore, experiments ... beyond that which can be regarded as humane, are unacceptable...