Most popular

IA - Avoiding common errors23 July 2019

Students are still learning how to complete an IA as they embark on this important piece of work. They gain so many new skills during the process that if it were possible to start again, once they have... more

Ecology mini-investigation11 October 2018

What does an Individual investigation look like? Students will try out all the steps of the planning and carrying out of the individual investigation in the collaborative safety of group work. For each... more

Measuring Equipment - IA skills training1 October 2015

This series of short experiments illustrates the skills a student needs to achieve high grades in data processing and the analysis of uncertainties in the IA investigation. These are important new skills... more

Ecological terms.25 March 2019

"Ecology is the study of the distribution and abundance of organisms, the interaction between organisms, the interaction between organisms and their environment, and structure and function of ecosystems."... more

A simple unit planner free8 September 2018

Unit plans are an integral part of the MYP and unit plans are featured in the Approaches to Teaching and Learning document (ATL) which the IB has published for the Diploma Programme. There are several... more

Drawing biological molecules24 September 2018

Students learn how to draw the following molecules; glucose, ribose, saturated fatty acid and an amino acid. They answers questions which gives practice in recognition of each molecule activity. This... more

Membrane Structurefree21 May 2017

Students watch a video diagram and have a chance to practise drawing a diagram of plasma membrane structure. Using a range of resources including; a screen cast, flashcards of the labels and their annotations,... more

Variation & overproduction17 May 2019

To understand how natural selection leads to evolution it is important to know about variation and overproduction of offspring. These two concepts are the key to understanding evolution. In this activity... more

Evolution examples8 October 2017

Students investigate adaptive radiation and industrial melanism as well as gradual divergence of populations into separate species. All of these ideas have been contested by some groups so IB students... more

Classification of Plants22 July 2019

Starting with some self study activities students begin to learn the names and features of the four plant phyla required for IB. Then, using a dichotomous key students search for examples of each phyla... more

Topic 1 - Cells revision activitiesfree22 May 2019

All the different aspects of the cells topic on a single A3 sheet, for revision. By completing short questions or explanations students are forced to review the whole topic and complete an overview of... more

A linear unit plannerfree12 January 2019

This unit planner template is a simple table, with sections for each aspect required by the IB standards and practices together with reminders in pale font color. Copy the table and edit it, deleting... more

Properties of Water.2 October 2018

This lesson uses a screen cast to introduce a simple diagram of hydrogen bonding in water. There are a range of activities to help student to understand how these hydrogen bonds affect the properties... more

IB style topic testsfree27 December 2014

These test are designed to help teachers assess students at the end of each topic and to help students practise IB style questions. They have been written specially for Inthinking Biology by experienced... more

Yeast and Catalase Experiment17 November 2016

Following a teacher demonstration of measuring the rate of hydrogen peroxide and catalase enzyme students carry out a circus of three simple enzyme experiments.These experiments illustrate the effects... more

Leaf stomata & transpiration7 January 2016

A short video introduction to the roles of cells in a leaf followed by some simple note taking about leaf structure and function. The function of stomata is linked to carbon dioxide absorption and also... more

12 Investigation ideas with a biological twist.free17 October 2018

Germination experiments and simple osmosis labs are seen all too often by moderators. If you want to show real personal engagement then your investigation has to have a 'twist' that shows you have really... more

Falsification of membrane structuresfree18 November 2017

The accepted model of membrane structure today is the fluid-mosaic model but this has not always been so. Since 1900 there have been a series of hypothetical structures proposed and tested. The evidence... more

Endosymbiosis - Nature of Sciencefree18 November 2017

The idea that mitochondria once existed as free living bacteria and that a simple cell engulfed one of these bacterial cells and promptly became a eukaryote cell is a difficult idea to ‘prove’. The... more

Lactose Intolerancefree23 July 2019

What is lactose intolerance and how can biology help those who are lactose intolerant? Students investigate the commercial uses of enzymes and in particular how the use of lactase in food production... more

Classification & binomial names20 July 2015

Students will learn how to classify organisms according to their taxonomic group, and how to understand the binomial nomenclature. These are a few introductory slides and then a card sorting activity... more

Planning pages & Learning activitiesfree6 October 2014

The new IB Biology guide has been written with an emphasis on concept based learning. The IBO wants to encourage teachers to focus on the students' understanding and the development of their skills rather... more

Further Membrane Structurefree27 August 2017

In this activity students see for themselves the wonderful interactions which occur inside cells and between cells using a short animation from Harvard university. The roles of some membrane proteins... more

Photosynthetic pigments 27 January 2017

Students investigate a simple practical method of separating photosynthetic pigments (practical 4)using paper chromatography (or thin layer chromatography). Following this there is an animation of chromatography... more

Intestine Structure & Function.27 June 2019

After learning how to draw an annotated diagram of the digestive system students extend their understanding by looking at details of intestine structure and how they relate to function. This includes... more

DNA structure - Extras for HL9 January 2019

This lesson introduces students to nucleosomes, and some of the details of DNA structure which will help to understand DNA replication. This includes the purine and pyrimidines bases as well as 5' and... more

Photosynthesis Experimentsfree16 February 2019

This activity introduces a simple method of measuring the rate of photosynthesis and leads students to design their own investigation of a factor which affects it. A second activity illustrates how the... more

Nerve impulses.28 September 2018

Name three different roles of integral proteins in cell membranes.How can integral proteins in a neurone plasma membrane cause an electrical potential across the membrane?What do these proteins do to... more

Intro to cladistics18 December 2016

What is a clade? How can we explain analogous and homologous traits using cladograms? What do we need to know about cladograms? All these important questions are covered in this lesson plan using a... more

Species and communities 4.1free12 August 2019

This is a quiz of multiple choice style questions about species and communities for topic 4.1They are self-marking questions, so you can click on 'check' to see whether you have the answer correct. more

Describing communities6 March 2018

A theoretical lesson to look at the role of organisms in food webs. Beginning with a short explanation of the roles and limiting factors this activity quickly moves to a model community and a challenge... more

Symbiosis v Competitive exclusion30 November 2016

The "Niche concept" is notorious as it's definition has never quite been pinned down and there exist many slight variations. This activity introduces the niche concept and the difference between realized... more

Modelling energy flow26 March 2018

This activity builds on the SL Ecology topic 'Energy in food chains'. Food chains show species in Trophic levels and multiple food chains usually exist within a community, shown by a food web. The most... more

Paper 3 Section A - questionsfree16 April 2016

Paper 3 section A is a new part of the IB Biology examinations this year in 2016The following details are adapted from Inthinking Chemistry pages by Geoff Neuss and information from the IBO more

Theoretical Genetics 1.2 February 2018

In this lesson students will be shown the link between chromosomes and genetics. A powerpoint intro to allele and genotypes in a simple case of inheritance of flower colour illustrates the link and demonstrates... more

Reclassification of figworts using cladisticsfree13 October 2016

In this lesson students first try to make a cladogram using the physical appearance of flowers from the figwort family. This illustrates how classification has been done for many years. In the second... more

Transcription - extras for HL8 January 2019

This lesson begins with a review of the process of transcription and the role of RNA polymerase but quickly turns to the control of gene expression using nucleosomes and methylation. Experiments with... more

Structure of the digestive system.3 May 2019

With a short screencast students learn a simple method of drawing a diagram of the digestive system. Annotations are added and students can practice their knowledge using some printable flashcards or... more

Photosynthesis Theory23 February 2016

Standard level students need to know about photolysis and the light independent reactions which take place in the stroma but with only simple details. This activity leaves out the complexity and gives... more

Light Dependent Reactions14 March 2019

This activity reviews the light dependent reactions of photosynthesis which occurs on the thylakoids of the chloroplast. A first activity introduces the parts of the membrane and the stages of the reactions,... more

Activation energy and enzyme pathways17 February 2019

Students are introduced to a simple metabolic pathway consisting of a chain of enzyme-catalysed reactions leading to the Kreb's cycle which is a cycle of enzyme catalysed reactions. The method of enzymes... more

Ultrastructure of cells quiz 1.21 September 2018

This is a quiz of multiple choice style questions about the Ultrastructure of cells topic for SL students.They are self-marking questions, so you can click on 'check' to see whether you have the answer... more

Theoretical Genetics 2.9 February 2018

Beginning with a review of the punnet square questions from last lesson, students are then introduced to some more complex genetics using the example of human blood groups. Teacher led Description of... more

Focusing a research question19 May 2017

One of the most important factors to the success of an Individual investigation is the choice of a relevant and focused research question. What does one of these look like? How can students write one?... more

IA Lipase Experiment17 November 2016

This lesson is an opportunity to complete some IA skills training. Students will have studied enzymes in the Biochemistry topic and so they will hopefully perform well in this IA. It links nicely to the... more

Respiration experiments.19 September 2015

Two nice experiments, the first looks a respiration rates in fly larvae and the second links the structures of different carbohydrates to the rate of respiration in yeast. This is an opportunity to discuss... more

Ventilation & lung disease22 July 2015

Students begin by looking at the muscle contractions which cause the pressure changes inside the thorax that force air in and out of the lungs to ventilate them. This is followed by an experiment to monitor... more

Cell Respiration.21 January 2019

With the smell of caramel from the burning glucose filling the lab, students discuss the need for metabolic pathways in respiration. A card sort activity and discussion will outline the main ideas for... more

Climate Change.free9 October 2018

Two short videos introduce this lesson. David Suzuki gives a simple outline of the process of climate change due to an enhanced greenhouse effect and the second illustrates the complexity of the models... more

Experiments on Transpiration.11 August 2017

What makes a good experiment?How can you estimate the uncertainty of any apparatus?What would the units be of the "Rate of transpiration"Carry out the activities on the Simple transpiration experiments... more