ConceptConceptDocsDocuments

IB Biology HL A3.2.8 Testing classification Question Bank

Practise IB Biology HL A3.2.8 by explaining how cladistic and molecular evidence exposes convergent evolution and changes plant classification.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how DNA, RNA or amino-acid evidence can overturn morphology-based classification.
  • Use convergent evolution and shared derived traits to justify reclassification into new families.

A3.2.8 (HL)—Testing classification correspondence question 1

[Maximum number: 1]

The figwort family is a large one consisting of many flowering plants that look similar. For what reason have some members of the family been reclassified into a new family?

A

Cladistic analysis shows the differences in flower structure to be fewer than the shared similarities.

B

DNA analysis shows the similarities in flower shape to be a product of convergent evolution.

C

DNA analysis shows some of the families to have suffered recent mutations in only one gene.

D

DNA analysis shows the similarities between the seed dispersal strategies to be a product of divergent evolution.

All question bank results loaded