Game for classifying living things with a yes-or-no key
A biology game that teaches how to classify living things the way scientists do: with a dichotomous key. An animal or a plant appears with a description of its features (what its skin is like, how many legs it has, how it breathes, how its young are born) and the key asks yes-or-no questions, one after another. Each answer opens a different path until you reach its group. On easy you tell apart the five vertebrate groups; on medium the invertebrates come in too (insects, arachnids, crustaceans, myriapods, molluscs, annelids, echinoderms, cnidarians and sponges); on hard, plants as well: mosses, ferns, gymnosperms and angiosperms.
Biology · Primary, Secondary
The bat flies but is a mammal; the dolphin has fins but breathes air; the spider is not an insect because it has eight legs; coral and sponges look like plants but are animals. The key makes you look at the feature that really defines the group, and those tricky cases come up on purpose, each with its explanation.
Dichotomous keys are what is used in the field and in guides to identify species. Learning to follow one, reading carefully and answering only from what you observe, is a skill that appears in primary science and secondary biology.
Each answered question stays on screen with its answer, so you can see the route through the key. If you get one wrong, the round stops and the whole correct path appears: that way you understand which feature the mistake was about, not just that it was wrong.
"A woodlouse appears: «Rolls into a ball; lives under damp stones; 14 jointed legs». Does it have a backbone? No. Jointed legs and an exoskeleton? Yes. Six legs? No, so it is not an insect even though it looks like one. Eight? No. Lots, more than 20? No. It is a crustacean, a land-living relative of prawns."
Prefer to learn without screens? Try this analogue version:
Choose eight animals or plants from the playground or a park and note down what each is like.
Find a yes-or-no question that splits them into two groups.
Repeat with each group until every living thing ends up alone at the end of a path.
Swap keys with another team and check whether they reach the same results.
If you like Dichotomous Key, these activities work similar skills:
Covers the five kingdoms, classification of animals and plants, vertebrates and invertebrates, with an explanation for each answer.
Another biology game: place producers, consumers and decomposers in their spot in the food web.
With a guide to local minibeasts or trees, go out to find three species and identify them with its key.
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