CAIE IGCSE Biology 1.2 Concept and Uses of Classification Systems Questions

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

Exam points

Classify organisms by shared morphological, anatomical, phenotypic or biochemical features.
Define a species by interbreeding to produce fertile offspring, and use genus/species rules in binomial names.
Follow paired contrasting statements in dichotomous keys to identify an organism from observable features.
Compare DNA or amino-acid sequences and branching points to infer shared ancestry and closer or more distant relationships.

Covered syllabus points

1.2.1—Organisms can be classified into 1.2.2—Species as a group of organisms that 1.2.3—Binomial species names 1.2.4—Dichotomous keys based on identifiable 1.2.5—Classification systems aim to reflect 1.2.6—DNA base sequences for classification 1.2.7—Groups of organisms which share a more

[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.

[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.

[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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