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      Classification into kingdoms and domains: sub-cellular evidence

      Lesson details

      Learning outcome

      I can describe the classification of organisms based on evidence from their phenotype and cells.

      Key learning points

      1. Organisms are classified into groups within larger groups, from species up to kingdoms and domains
      2. There are domains of eukaryotes (animals, plants, fungi and protists), bacteria and archaea (both prokaryotic)
      3. Organisms can be classified using evidence of their macroscopic features (phenotype)
      4. Organisms can be classified using evidence of their and microscopic cell structures

      Keywords

      • Species - a group of similar organisms that can breed together to produce fertile offspring

      • Kingdom - A division of living things in the classification system. The five kingdoms are animals, plants, fungi, protist and prokaryotes.

      • Domain - The three domain system of classification organises organisms into three large groups: Bacteria, Archaea and Eukaryota.

      • Phenotype - the physical characteristics of an organism

      Common misconception

      Pupils may think that the modern classification system that we use today is complete.

      Remind pupils why new data from experiments or observations leads to changes in models or theories.

      Teacher tip

      Reinforce ideas about how developments in technology and scientific methods (microscopy and gene technology) has provided evidence for changing theories over time.

      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 type of microsope is shown in the image?

      An image in a quiz
      scanning electron microscope
      transmission electron microscope
      Correct answer: light microscope

      Q2.
      Which type of cells contain membrane bound sub-cellular structures, including a nucleus?

      prokaryotic cells only
      Correct answer: eukaryotic cells only
      both prokaryotic and eukaryotic cells
      neither prokaryotic nor eukaryotic cells

      Q3.
      Which type of cell, prokaryotic or eukaryotic, is generally smaller in size?

      Correct answer: prokaryotic
      eukaryotic

      Q4.
      If a bacterial cell has a diameter of 1.5 micrometres, how many times smaller is it compared to a eukaryotic cell with a diameter of 15 micrometres?

      Correct answer: 10 times
      100 times
      1000 times
      15 times

      Q5.
      Which of the following statements about microscopes are true?

      Light microscopes have a higher resolution than electron microscopes.
      Correct answer: Llight microscopes have a lower resolution than electron microscopes.
      Light microscopes have a higher magnification than electron microscopes.
      Correct answer: Light microscopes have a lower magnification than electron microscopes.

      Q6.
      Calculate the real size of a cell if its image size is 200 micrometres and the magnification is 400x.

      800 micrometres
      500 micrometres
      80 micrometres
      Correct answer: 0.5 micrometres

      6 Questions

      Q1.
      Which scientist is known as the father of modern classification and introduced the binomial naming system?

      Carl Woese
      Charles Darwin
      Correct answer: Carl Linnaeus
      David Attenborough

      Q2.
      Starting with the largest group, sort the groups of Linnean classification into the correct order.

      1 - kingdom
      2 - phylum
      3 - class
      4 - order
      5 - family
      6 - genus
      7 - species

      Q3.
      What is the binomial name for the Santiago tortoise?

      An image in a quiz
      Testudinidae darwini
      Reptilia Testudines
      Testudines Testudinidae
      Correct answer: Chelonoidis darwini

      Q4.
      What is the significance of Woese's contribution to classification?

      He developed the Linnaean system.
      He introduced the binomial naming system.
      Correct answer: He used DNA sequences to refine classification.
      He classified organisms based on physical characteristics.

      Q5.
      According to the three-domain system, which domain includes animals, plants, fungi, and protists?

      Correct answer: Eukaryota
      Archaea
      Bacteria
      Prokaryota

      Q6.
      Which domain contains organisms that are often extremophiles and live in extreme environments?

      Eukaryota
      Bacteria
      Correct answer: Archaea

      To help you plan your 11 combined science lesson on: Classification into kingdoms and domains: sub-cellular evidence, download all teaching resources for free and adapt to suit your pupils' needs...