Cell Theory

Start with the main ideas

The Cell Theory mind map is a useful starting point. It sets out the ideas that living things are made of cells, cells are the smallest unit of life, and cells come from preexisting cells. It also introduces cell classification, including prokaryotic and eukaryotic cells, bacteria, and plant and animal cells.

After the map, read the Cell Theory note. Use it to put the main principles into your own words. Compare your explanation with the map and note, and return to any point you find difficult to describe.

Look at evidence and cell origins

The IB SL Biology: Cells mind map presents the principles of cell theory alongside an example involving sealed and open soup containers. It gives you a place to connect the statements of the theory with evidence.

Next, look at the mind map on the origin of cells. It covers cells arising from preexisting cells, the first cells and the origin of eukaryotic cells, including endosymbiotic theory. The note on cell theory, cell specialization and cell replacement offers another way to review the principles and introduces functions of life.

Combine maps, flashcards and quizzes

Use a mind map to see how ideas fit together, then use the IB year-one biology flashcards to practice recalling cell theory, evidence and functions of life. Try the Cell Theory quiz after studying, and use the maps or notes to revisit ideas you want to check.

Use the wider unit

Cell Theory is a section of Cell Structure, Cell Theory and Microscopy in Biology and natural sciences. The classification ideas in the Cell Theory map provide a connection to the cell structure part of the unit, while the unit also places this topic alongside microscopy.

Choose a resource and build a study sequence that suits you.