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      Classifying organisms using a classification key

      Lesson details

      Learning outcome

      I can explain how to use a classification key, and the importance of classifying organisms into groups within larger groups.

      Key learning points

      1. A classification key can be used to find out which groups organisms are classified into.
      2. A classification key is a series of questions about the features of organisms.
      3. Classification helps us organise and make sense of biodiversity.

      Keywords

      • Taxonomy - The practice of classifying.

      • Classification - The process of sorting things into groups.

      • Classification key - A series of questions about the features of organisms that help us to classify them correctly.

      Common misconception

      Animals are misclassified based on features that have been incorrectly interpreted, such as wings.

      Animals which are often misclassified are included as explicit examples, such as bat, whale and penguin.

      Teacher tip

      Use mini whiteboards or other wipeable surface for students to write their classification questions on. Use a selection of biscuits (be aware of allergies) which are different shapes, some with fillings etc, to practice producing classification keys.

      Licence

      This content is © Oak National Academy Limited (2026), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      Which classification level has groups called ‘Animals’, ‘Plants’ and ‘Fungi’?

      genus
      Correct answer: kingdom
      species

      Q2.
      A species is a group of organisms which …

      share few similarities with each other.
      Correct answer: can reproduce to produce fertile offspring.
      have a backbone.

      Q3.
      The frog (Rana temporaria) and toad (Bufo bufo) are both animals. Which statement correctly describes the difference between?

      Correct answer: They are both different species.
      They are both from the same genus.
      They are both from a different kingdom.

      Q4.
      Starting with the largest, sort these groups into order of size.

      1 - animal
      2 - reptile
      3 - snake
      4 - python

      Q5.
      Which option shows the correct way to format the binomial name for a mushroom?

      Correct answer: Amanita muscaria
      Amanita muscaria
      amanita muscaria
      amanita muscaria

      Q6.
      Match the classification level with the name of the daisy (Bellis perennis).

      Correct Answer:kingdom,plant

      plant

      Correct Answer:genus,Bellis

      Bellis

      Correct Answer:species,perennis

      perennis

      6 Questions

      Q1.
      Match the animal to its correct classification class.

      Correct Answer:cod,fish

      fish

      Correct Answer:elephant,mammal

      mammal

      Correct Answer:newt,amphibian

      amphibian

      Correct Answer:cobra,reptile

      reptile

      Q2.
      Select the classification level which will have the greatest number of organisms with the most differences between them.

      Correct answer: phylum
      class
      genus
      species

      Q3.
      Taxonomy is the practice of:

      Identification
      Correct answer: Classification
      Organisation

      Q4.
      We can use a to accurately put organisms into groups based on questions about their characteristics.

      Correct Answer: classification key, key, dichotomous key

      Q5.
      Use the classification key to classify a dolphin.

      An image in a quiz
      bird
      Correct answer: mammal
      fish

      Q6.
      Which student offers a reason why we classify organisms?

      Lucas: "Classification keys can be made electronic for use in the field."
      Alex: "Classification is quick and simple."
      Correct answer: Izzy: "Classification makes sense of biodiversity."

      To help you plan your 8 science lesson on: Classifying organisms using a classification key, download all teaching resources for free and adapt to suit your pupils' needs...