QCE Biology EA Practice Units 3 & 4
Practice questions on biodiversity, ecosystem dynamics, DNA, and the continuity of life on Earth.
QCE Biology Units 3 and 4 explore biodiversity, ecosystem dynamics, the role of DNA in inheritance, and the continuity of life on Earth through evolution. The external assessment contributes 25% of your overall subject result. Revizi’s practice questions are aligned to QCAA syllabus content, helping you prepare for the types of questions and cognitive demands you’ll face in the EA.
External Assessment: External assessments (EAs) are centrally set examinations developed by QCAA for each General subject. For most subjects, the EA contributes 25% of the overall subject result, with the remaining 75% coming from three internal assessments (IA1, IA2, IA3). For Biology, the EA covers Units 3 and 4 content and includes multiple-choice, short-response, and extended-response questions.
Topics Covered
Unit 3 Topic 1: Describing biodiversity
- Classification and taxonomy
- Biodiversity indices and measurement
- Distribution of species
- Impact of humans on biodiversity
Unit 3 Topic 2: Ecosystem dynamics
- Energy flow in ecosystems
- Biogeochemical cycles
- Population dynamics
- Ecological relationships and interactions
Unit 4 Topic 1: DNA and genes
- DNA structure and replication
- Gene expression and regulation
- Mutations and their effects
- Genetic technologies
Unit 4 Topic 2: Continuity of life on Earth
- Natural selection and evolution
- Speciation and evidence for evolution
- Human evolution
- Genetic variation in populations
Question Types
Multiple-Choice Questions
Practice MCQs covering Unit 3 and 4 content from the QCAA syllabus.
Short Response Questions
Build technique with 2–5 mark responses requiring precise, evidence-based answers.
Extended Response
Practice 8–15 mark essays requiring structured arguments and analysis.
Stimulus-Based Questions
Analyse data, case studies and source material in context.
How Revizi Helps
QCAA Syllabus Alignment
Every question maps to QCAA syllabus content from Units 3 & 4.
Spaced Repetition
Weak areas are automatically scheduled for review to build long-term retention.
Performance Tracking
Monitor your accuracy across units and topics to prioritise remaining study time.
Related Practice Pages
Frequently Asked Questions
How much does the QCE Biology EA count?
The external assessment contributes 25% of your overall subject result. The remaining 75% comes from three internal assessments.
What format is the QCE Biology EA?
The EA includes multiple-choice, short-response, and extended-response questions covering Units 3 and 4 content.
Are these actual past EA questions?
No. Revizi generates original practice questions aligned to QCAA syllabus content for Biology Units 3 & 4.
Last updated: March 2026