Activities
Origins of water - model answers
These are suggested model answers for Activity 2 - Where did water the earth's water come from? on the page The origins of water on Earth HL (2025). As model answers they don't cover all the possible...
Activities
The origins of water on Earth HL (2025)
Water is the medium in which enzyme reactions happen in all known living organisms. It is essential for life and many life forms use water as a habitat. We can see this in the oceans, lakes and rivers...
Activities
Spontaneous origins of the first cells
This activity gets students to explore the evidence for the spontaneous origin of the first life on Earth and the research which has tried to identify the last unique common ancestor (LUCA) An information...
Activities
Spontaneous origins model answers
These are suggested model answers for the activity IB style questions about the spontaneous origin of cells and the LUCA on the page Spontaneous origins of the first cells As model answers they don't...
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IB DP Biology textbooks for 2025 exams
This short review of the new 2023 editions of DP Biology text books, for first exams in 2025 outlines some of the main features of each. There is a good choice, which is complicated because each book...
Activities
Debatable - the quality of supporting evidence
This activity gives an opportunity to use the information about evidence from the "Spontaneous creation" learning activities. A sorting activity with a creative slant collates the evidence for the spontaneous...
Activities
Unicellular v Multicellular (2025)
If you want to be bigger than an Amoeba you need either giant cells or lots of cells. As the SA:Vol ratio limits cell size the only option is to be an organism made from lots of cells. The human body...
Activities
Scientific Investigation into making yoghurt (2025)
This lab could be used as a 'mini IA' to introduce students to the Scientific Investigation which they will do as internal assessment (IA), The activity uses microscope skills from this topic to test...
ATL in Biology
Membrane Permeablility Experiment
This experiment is a good first assessment of manipulative skills, data collection and processing. Students measure the diffusion of pigments out of beetroot cells. By increasing the temperature of the...
Activities
Cell theory & cell structures (2025)
The focus of this activity is to use microscopes to produce images of cells and to consider the devopment of microscope techniques. Each technique has advantages and specific uses. The activities include...