Home of real teaching & learning
- Full support for teachers
- Focus on critical thinking
- Engaging classroom activities
- Integrated student eBook
- Assessed tasks / qBank
- Practice exam questions
The InThinking Guarantee: Our sites are written by expert practitioners and not by AI
See our AI policyDisclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.
Don't miss out, find out!
- Free trials Take out a one month free trial today!
- Newsletters Subscribe to our FREE subject site newsletters.
Recommendations
Read what users are saying about the site.Video overview
Site authors
IB Approved Workshops
Environmental systems and societies: A focus on internal assessment
IB DP Category 3
Paris, France, 13 - 15 November 2026
Find out more
Biology
IB DP Category 2
Paris, France, 13 - 15 November 2026
Find out more
Biology
IB DP Category 2
Barcelona, Spain, 12 - 14 February 2027
Find out more
Virtual Think-Ins
Find all InThinking events at
inthinking.net
Quote of the day
The true delight is in the finding out rather than in the knowing.
InThinking
Supporting international schools with high quality PD & interactive online resources
Dynamic
Creative
Personal
Creative
Personal
Selected student pages
See all
Most popular
See all
Blog
Free
5 Oct 2026
Richard Scarr
It is with great sadness that we have to announce the passing of Richard Scarr. He was always an enthusiastic biologist and a dedicated educator. After reading Biology at Kings College in London he taught...
12 Aug 2026
Exam practice questions
Over the summer we have completed a full set of exam practice question pages, one for each topic. These pages are great for homework or revision. The Exam practice concept; The pages all have “exam practice”...
Recommendations
See all"This year is my first year teaching IB Biology. The In Thinking Biology site has proven to be immensely valuable to the quality and delivery of my lessons."
Karin Hartog
D Y Patil International School
"These are excellent resources, ideas and insights for teaching DP Biology. Very useful and user friendly. Totally worth it."
Joao Paulo Ricchio
American School of Rio de Janeiro
Subscriber comments
-
Hello, where can I find the revision quiz for reproduction?
D3.1 Reproduction - planning sheet -
Extremely sad to hear this.He contributed so much to teaching. He will always be remembered.
Richard Scarr -
Could you please check the cladograms at the bottom of the first page of the "Using DNA sequences to build cladograms" worksheet? The first and third cladograms are the same. I think B and A need to be swapped in the third one.
Reclassifying using DNA, cladistics & rRNA (2025)
Samuel
Hello, Where can I find the reproduction revision quiz? Is there no longer a quiz folder?
D3.1 Reproduction - student friendly summary