QCE Biology EA Practice Units 3 & 4
Practice questions on biodiversity and populations, functioning ecosystems, genetics and heredity, and the continuity of life on Earth.
QCE Biology Units 3 and 4 explore biodiversity and population ecology, functioning ecosystems and succession, genetics and heredity, and the continuity of life on Earth through evolution. The external assessment contributes 50% 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 Biology and the other science subjects, the EA contributes 50% of the overall subject result (IA1 10% + IA2 20% + IA3 20% = 50% internal, 50% external). 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, Genes and the Continuity of Life
- 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
Questions are organised around 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 50% of your overall subject result (IA1 10% + IA2 20% + IA3 20% = 50% internal). See the QCAA syllabus for the exact assessment breakdown.
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