QUESTION 21 (4 marks)
In the Linnaean system of classification, the features used to classify living things change according to taxonomic levels. Describe, using relevant examples, how these features change.
QCAA guide · typeset solution
QCAA sample response and mark allocation
21 | The features used to classify living things change as you go from the broader taxonomic level to the more specific. Kingdom is the most extensive, so the features encompass the widest variety of organisms, with features such as cell type and structure. Through the middle taxa, features become more specific, with an emphasis on minor shared similarities such as fur, body shape and leaf shape. At the species level, features such as teeth structure, body size, behaviour and distribution may be used, as well as the more recent use of biochemical similarities. | • states that the Linnaean system - starts with broad taxa that have major similarities [1 mark] - has lower taxa that become more specific, with minor similarities [1 mark] • provides a relevant example for broad taxa [1 mark] • provides a relevant example for mid OR narrow taxa [1 mark] |
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