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Science

Classifying Living Things

Overview

Students explore the system scientists use to organise all living things, discovering that classification reflects evolutionary relationships as well as physical similarities.

Learning Objective
Students understand why scientists classify living things and can sort organisms into the five kingdoms.

Resources needed

  • None

Lesson stages

0 / 7 done
  1. 1 Ask: how many different living things exist on Earth? (Millions — over 8 million estimated species).
  2. 2 Ask: why do scientists need a system to organise them all?
  3. 3 Introduce the five kingdoms: animals, plants, fungi, bacteria, protists.
  4. 4 Key features of each: animals (move, eat others), plants (make food from light), fungi (absorb dead matter), bacteria (single-celled, no nucleus), protists (single-celled, with nucleus).
  5. 5 Sort a range of organisms into kingdoms: human, mushroom, oak tree, E. coli, amoeba, eagle, seaweed.
  6. 6 Ask: where does a virus fit? (It does not fit into any kingdom — viruses are not considered fully alive).
  7. 7 Discuss: why do scientists change classification systems when they learn more?

Tap a step to mark it as done.

Variations

  • Build a classification key: a series of yes/no questions that lead to an identification.
  • Focus on the animal kingdom and its subgroups: vertebrates and invertebrates.
  • Compare older (two-kingdom) with modern (five-kingdom or domain) classification systems.
More information

Teach: kingdom, taxonomy, classify, species, vertebrate, invertebrate, nucleus, organism. A simple sorting table — five columns for the five kingdoms — organises the lesson visually.

Focus on three kingdoms — animals, plants, fungi — before introducing bacteria and protists.

Can students correctly classify eight familiar organisms into kingdoms? Can they give the key feature that distinguishes one kingdom from another?

No resources needed. Use organisms visible in the school environment. Draw the classification table in soil.

Students often place fungi with plants because they do not move. Fungi do not photosynthesise — they break down dead matter by absorbing it. This is fundamentally different from how plants feed.

Classification systems reflect our understanding of evolution and relationships between organisms. Modern DNA analysis has transformed our understanding of how living things are related.

Activity details
Primary Medium 25 minutes no prep Small Group, Whole Class Indoor & Outdoor
Topics
Classification Kingdoms Taxonomy