NESA Biology Stage 6 Syllabus (2017), examined from 2019 to 2026
Year 12 Biology is assessed through school-based tasks, including a depth study, and the HSC written examination. In the examination the first twenty questions are objective-response items worth one mark each; the written-response questions that follow have ranged from three to nine marks, with the longest spanning several parts of one scenario. Almost everything is built on stimulus — a graph, karyotype, pedigree, codon chart, life-cycle diagram or data table — so Working Scientifically skills such as identifying variables and evaluating methodology are examined alongside module content.
Past papers on this subject span more than one syllabus. Papers written under an older one still work as practice, but the modules they test have changed — the index labels every paper with the syllabus it was set under.
Biology Stage 6 Syllabus (2013) · 2013–2018Biology Stage 6 Syllabus (2017) · 2019–2026Biology 11–12 Syllabus (2025) — new syllabus, not yet examined · 2027–TBC
The modules, one by one
Each area below lists the concepts named in the syllabus, what the NESA exam asks of them, and the mistake that most often costs marks.
Area 1 of 4
Module 5: Heredity
Heredity follows genetic information from parent to offspring, and from DNA to protein. It opens with reproduction across the full range of life — sexual and asexual mechanisms in animals, plants, fungi, bacteria and protists — then human fertilisation, implantation and the hormones that maintain pregnancy. Cell replication covers mitosis, meiosis and DNA replication against the Watson and Crick model. Polypeptide synthesis takes you through transcription and translation, the roles of mRNA and tRNA, and the way environment interacts with genotype to produce phenotype. Genetic variation is the heaviest strand: crossing over, autosomal and sex-linked inheritance, co-dominance, incomplete dominance, multiple alleles, pedigrees, Punnett squares and single nucleotide polymorphisms. The module closes at population scale with DNA sequencing and profiling, population genetics in conservation, patterns of disease inheritance and evidence for human evolution.
What the syllabus lists under this area · 5 points
- Reproduction (sexual/asexual mechanisms across animals, plants, fungi, bacteria, protists; fertilisation, implantation, hormonal control of pregnancy)
- Cell Replication (mitosis, meiosis, DNA replication — Watson & Crick model)
- DNA and Polypeptide Synthesis (transcription, translation, mRNA/tRNA, gene-environment interaction on phenotype)
- Genetic Variation (meiosis modelling, crossing over, autosomal/sex-linkage/co-dominance/incomplete dominance/multiple alleles, pedigrees, Punnett squares, SNP analysis)
- Inheritance Patterns in a Population (DNA sequencing/profiling, population genetics in conservation, disease inheritance, human evolution)
What the exam asks
Genetics questions are worked, not recalled: complete an mRNA strand from a DNA template, read a Punnett square, use ABO blood group rules to deduce possible parental genotypes, or combine a pedigree, a codon chart and gel electrophoresis data in one multi-part question. Reproduction has appeared as a comparison of human and fungal life cycles, and as a hormone table read from a pregnancy graph.
Where marks go missing
Losing marks on notation and direction — writing a complementary strand with thymine instead of uracil, reversing the reading direction, or asserting a genotype from a pedigree without the reasoning that excludes the alternatives. The justification, not the answer, carries the marks.
11 real NESA questions indexed on this area →
Area 2 of 4
Module 6: Genetic Change
Genetic change deals with how gene pools shift and how humans deliberately shift them. Mutation comes first: mutagens and their effects, point mutations against chromosomal mutations, and the distinction between somatic mutations, which die with the individual, and germ-line mutations, which are inherited. You examine coding and non-coding DNA, and the population-level mechanisms of gene flow and genetic drift. Biotechnology is treated historically and ethically — past, present and emerging applications, their social implications, and their effect on biodiversity. Genetic technologies then get specific: artificial insemination and artificial pollination, whole-organism cloning and gene cloning, recombinant DNA technology and transgenic organisms, with agricultural, medical and industrial applications attached to each. The module expects you to hold a defensible position on whether a given technology is beneficial, supported by evidence rather than opinion.
What the syllabus lists under this area · 3 points
- Mutation (mutagens, point vs chromosomal mutation, somatic vs germ-line, coding/non-coding DNA, gene flow and genetic drift)
- Biotechnology (past/present/future applications, social and ethical implications, effect on Earth's biodiversity)
- Genetic Technologies (artificial insemination/pollination, whole organism and gene cloning, recombinant DNA technology, transgenic organisms, agricultural/medical/industrial applications)
What the exam asks
This module supplies the evaluative questions. Past papers have asked students to evaluate a set of cattle-farming biotechnologies for their effect on biodiversity, and to judge how bushfires and an introduced male altered both the size and the gene pool of an isolated marsupial population using map and time-series data. Shorter items sequence the steps of gene cloning or name a mutation type from a described mutagen.
Where marks go missing
Answering 'evaluate' as though it said 'describe'. Listing what selective breeding, cloning and transgenics do earns little without a stated judgement about the effect — usually on genetic diversity — and a reason tied to each named technology.
9 real NESA questions indexed on this area →
Area 3 of 4
Module 7: Infectious Disease
Infectious disease starts with causation: classifying pathogens as prions, viruses, bacteria, protozoa, fungi or macroparasites, their modes of transmission, and the historical work that established germ theory through Koch's postulates and Pasteur's experiments, plus the effect of pathogens on Australian agriculture. Responses to pathogens covers plant defences against fungal and viral infection, and animal responses at cell and tissue level. Immunity separates the innate system, which reacts the same way to anything foreign, from the adaptive system, which is specific and remembers, and asks you to explain what happens on primary exposure and what acquired immunity means. Prevention, treatment and control ranges across hygiene, quarantine, vaccination programs, antivirals and antibiotics, the management of epidemics and pandemics, and the protocols governing Aboriginal and Torres Strait Islander medicinal knowledge.
What the syllabus lists under this area · 4 points
- Causes of Infectious Disease (pathogen classification, modes of transmission, Koch's postulates, Pasteur's experiments, agricultural impacts)
- Responses to Pathogens (plant responses to fungal/viral pathogens, animal cellular/tissue responses)
- Immunity (innate and adaptive immune systems, primary exposure response, acquired immunity)
- Prevention, Treatment and Control (hygiene, quarantine, vaccination, antivirals/antibiotics, epidemic/pandemic management, Indigenous medicine protocols)
What the exam asks
Immunity is examined through process description — how phagocytes protect the body, and how antibodies are produced once a pathogen enters. Data questions dominate the rest: classifying cell types from a time-course graph, assessing a tetanus vaccination schedule from antibody levels across multiple doses, or outlining a procedure to determine whether an outbreak pathogen is viral or bacterial.
Where marks go missing
Blurring innate and adaptive responses. Phagocytosis, inflammation and fever are innate; antibody production and memory cells are adaptive. Describing B cells as a first line of defence, or placing specificity in the innate system, forfeits marks even when the surrounding biology is sound.
7 real NESA questions indexed on this area →
Area 4 of 4
Module 8: Non-infectious Disease and Disorders
This module covers everything that harms the body without a pathogen. Homeostasis is the framework: negative feedback loops for temperature, glucose and calcium, the adaptations endotherms use to hold internal conditions steady, the split between hormonal and neural coordination, and the mechanisms plants use to maintain water balance. Causes and effects groups non-infectious disease as genetic, environmental or nutritional, adds cancer, and requires you to read incidence, prevalence and mortality data correctly. Epidemiology teaches how studies linking exposure to disease are designed and, more importantly, how to critique them for sample size, confounding variables and unsupported causal claims. Prevention covers education campaigns and genetic approaches. The final strand is technology: hearing loss, visual disorders and kidney failure, the devices that compensate for each, and how effectively they restore function.
What the syllabus lists under this area · 5 points
- Homeostasis (negative feedback loops, endotherm adaptations, hormonal/neural coordination, plant water balance)
- Causes and Effects (genetic, environmental, nutritional diseases; cancer; incidence/prevalence/mortality data)
- Epidemiology (patterns of non-infectious disease, epidemiological study design and evaluation)
- Prevention (disease-prevention methods, educational campaigns, genetic engineering)
- Technologies and Disorders (hearing loss, visual disorders, kidney function — assistive technologies and their effectiveness)
What the exam asks
Expect the longest evaluative question here — critiquing the methodology of an epidemiological study — plus calculations of incidence from case counts and a population figure. Homeostasis is examined by applying a labelled feedback diagram to a given reading and predicting the hormonal correction. Technology questions want the underlying structural or functional fault explained before the assistive device is described.
Where marks go missing
Describing an assistive technology without the biology it replaces. A cochlear implant answer that never identifies which structure has failed, or what the electrode array actually stimulates, cannot reach the higher marks however detailed the device description is.
8 real NESA questions indexed on this area →
Common questions
Which syllabus is the current HSC Biology exam based on?
The Biology Stage 6 Syllabus published in 2017, first examined in 2019 and running through to 2026. A new Biology 11–12 syllabus dated 2025 applies from 2027 and has not yet been examined. Papers from 2019 onwards match the current Module 5 to 8 structure; earlier papers sit under the 2013 syllabus.
Is Year 11 Biology content examined in the HSC?
The HSC examination assesses Modules 5 to 8, but Year 11 knowledge is assumed rather than discarded. Cell structure and transport, enzymes, gas exchange and biodiversity underpin the Year 12 modules, and questions on homeostasis, immunity or reproduction routinely expect you to use them without being reminded.
Why do HSC Biology papers before 2019 look so different?
They were set on the 2013 Stage 6 syllabus, which had a different structure including option topics. Those papers still contain useful practice on genetics, immunity and homeostasis, but whole questions target content that no longer appears, so treat them as a supplement to the 2019 papers onwards.
Are the four modules examined separately in the paper?
No. Questions from all four modules are interleaved through both the objective-response and written-response sections rather than grouped module by module, and longer questions can pull content across module boundaries. Revising one module at a time is fine, but practise switching between them under timed conditions.