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CAIE IGCSE Biology 1.2 Classification Systems

Practise defining species, using binomial names and keys, and interpreting molecular evidence for evolutionary relationships.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • use a binomial name to identify genus and species and define species through fertile offspring
  • follow each paired statement in a dichotomous key to classify an organism from visible features
  • compare DNA or amino-acid sequences and branching points to infer how recently organisms shared an ancestor

Covered syllabus points

1.2.1—Organisms can be classified into1.2.2—Species as a group of organisms that1.2.3—Binomial species names1.2.4—Dichotomous keys based on identifiable1.2.5—Classification systems aim to reflect1.2.6—DNA base sequences for classification1.2.7—Groups of organisms which share a more

1.2 Concept and uses of classification systems question 1

[Maximum number: 1]

Viruses can cause diseases.

Fig. 6.1 shows four different viruses.

Fig. 6.1

Fig. 6.1

Suggest one feature that could be used to classify viruses into groups.

1.2 Concept and uses of classification systems question 2

[Maximum number: 2]

Fig. 3.3 shows the parts of two flowers from two different plants of the same species.

Fig. 3.3

Fig. 3.3

Describe what is meant by the term species.

1.2 Concept and uses of classification systems question 3

[Maximum number: 1]

Fig. 6.1 shows a boreal toad, Anaxyrus boreas. This toad is listed as an endangered species.

Fig. 6.1

Fig. 6.1

State the genus of the boreal toad.

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