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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

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Put down your highlighter!

31 July 2018

Put down your highlighter. Make marginal notes or comments instead. How many of us see students highlighting key points but actually covering... more

InThinking student groups

7 July 2018

Imagine if you could ask your students to read a page of this website and your mark book automatically checked that they have done this reading... more

Using micro-organisms in IB Bio labs

31 May 2018

We cannot argue that micro-organisms are as important to our lives as photosynthesis. We shouldn't describe bacteria simply as harmful or beneficial,... more

Subscriber comments


  • 25 Sep Chris Gerding
    Populations - Planning sheet C5
    Hi David...curious about the "Fish stocks and algal blooms" activity here. Is this something that will be coming soon?
  • I believe the wrong calculation is done for the O-E squared divided by E column in the leaves without blotches column - should the 29 be 30?
  • Do you have suggested answers for Activity 2: Data analysis questions about an epidemiological heart disease study?
  • 23 Sep David Faure
    Paper 3 Section A - questions
    Dear Nery, Thanks for your comment. Unfortunately we can't get the computer to mark the answers automatically for these types of questions, only for multiple choice types. Unfortunately the score will be always be 0, but the check button...
  • 23 Sep David Faure
    TOK Induction extension work
    Dear Catherine, Thanks for asking your questions. I have added a worksheet of questions to this activity page, and there are some points about the answers in the teachers' notes at the bottom of the page. I hope that helps, David
  • Hi Neelu, You can print the page using the printer icon on the right hand side of the page. Print to file/pdf should do it. Best wishes, David
  • 23 Sep David Faure
    Gene Linkage 1.
    Thanks Linet, I have repaired the link in the teachers' notes. Best wishes, David
  • 22 Sep Nery Valderrama
    Paper 3 Section A - questions
    How do you have the students complete this? I was doing it myself, and even though the answers were correct, it marked them incorrect.
  • Can you add model answers David? Thanks.
  • model answers?
  • 19 Sep Catherine Keating
    TOK Induction extension work
    Dear David When I try to open the Worksheet of questions and the Worksheet of answers neither of them open. Could you please check if there is something wrong with the two links. Thanks.
  • 19 Sep Neelu Sharma
    Enzymes & metabolism HL quiz 8.1
    David, I would appreciate if these questions can be downloaded. Thank you for adding resources.