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CAIE IGCSE Biology 1.2.4 Constructing & Using Dichotomous Keys

Practise following paired choices and constructing statements that identify organisms from visible, contrasting features.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • follow paired feature choices until each labelled organism reaches the correct taxon
  • write observable contrasting statements that separate organisms at one branch

1.2.4—Dichotomous keys based on identifiable question 1

[Maximum number: 2]

Fig. 1.1 shows four arthropods.

Fig. 1.1

Fig. 1.1

Fig. 1.2 is a dichotomous key for the arthropods shown in Fig. 1.1.

Complete Fig. 1.2 by writing suitable statements in:
- box 2 to identify species B
- box 3 to separate species C and A.

Fig. 1.2

Fig. 1.2

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