Practice Videos Blog Flashcards Español

All Practice Exams

100+ Free HSC Biology Practice Questions

Pass your HSC Biology (NSW Higher School Certificate, Year 12) exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More NSW HSC (Higher School Certificate)

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

HSC Chemistry (NSW)

Practice Questions100 questions

HSC Mathematics Advanced (NSW)

Practice Questions100 questions

2026 Statistics

Key Facts: HSC Biology Exam

100 marks

Total marks for the HSC Biology written examination

NESA - Biology assessment and reporting

20 marks

Section I has 20 multiple-choice questions worth 20 marks

NESA - Biology assessment and reporting

80 marks

Section II has 20 to 25 short-answer and extended-response items worth 80 marks

NESA - Biology assessment and reporting

3 hours

Working time, plus 5 minutes reading time, for the exam

NESA - Biology assessment and reporting

Modules 5-8

Year 12 covers Heredity, Genetic Change, Infectious and Non-infectious Disease

NESA - Biology Stage 6 Syllabus (2017)

Equal weighting

Modules 5 to 8 carry approximately equal weighting in the exam

NESA - Biology assessment and reporting

6 bands

Results are reported on six performance bands, Band 6 highest

NESA - HSC reporting

From 2027

The new Biology 11-12 Syllabus (2025) replaces the 2017 syllabus from 2027

NSW Curriculum - Biology 11-12 Syllabus (2025)

HSC Biology is the Year 12 NSW Higher School Certificate biology course examined by NESA. The written exam is worth 100 marks over 3 hours plus 5 minutes reading time: Section I is 20 multiple-choice questions (20 marks) and Section II is 20-25 short-answer and extended-response items (80 marks), with at least two items worth 7-9 marks. The Year 12 course covers Modules 5 Heredity, 6 Genetic Change, 7 Infectious Disease and 8 Non-infectious Disease and Disorders, given roughly equal weighting, with Working Scientifically skills integrated throughout. There is no fixed pass mark; results are reported on a 0-100 mark and six performance bands. This 100-question bank gives free, original multiple-choice practice across all four modules plus data interpretation.

Sample HSC Biology Practice Questions

Try these sample questions to test your HSC Biology exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which process produces four genetically different haploid cells from one diploid cell?

A.Mitosis

B.Meiosis

C.Binary fission

D.DNA replication

Explanation: Meiosis involves two divisions and produces four haploid gametes that are genetically different from one another and from the parent cell, due to crossing over and independent assortment. Mitosis produces two genetically identical diploid cells.

2During DNA replication, the enzyme that joins free nucleotides to the growing strand by reading the template in the 3' to 5' direction is:

A.DNA helicase

B.DNA polymerase

C.DNA ligase

D.RNA primase

Explanation: DNA polymerase adds complementary nucleotides to the new strand, reading the template strand 3' to 5' and synthesising the new strand 5' to 3'. Helicase unwinds the helix and ligase joins Okazaki fragments.

3A section of DNA template strand reads 3'-TAC GGA-5'. What is the sequence of the mRNA transcribed from it?

A.5'-AUG CCU-3'

B.5'-ATG CCT-3'

C.5'-UAC GGA-3'

D.5'-AUG GGA-3'

Explanation: Transcription pairs each template base with its complementary RNA base (A-U, T-A, G-C, C-G), so TAC GGA gives AUG CCU. RNA uses uracil (U) instead of thymine (T).

4Where in a eukaryotic cell does translation (polypeptide synthesis from mRNA) occur?

A.In the nucleus

B.At the ribosomes

C.In the mitochondria only

D.Inside the nuclear envelope

Explanation: Translation occurs at ribosomes in the cytoplasm or on the rough endoplasmic reticulum, where tRNA brings amino acids to match the mRNA codons. Transcription, not translation, occurs in the nucleus.

5In pea plants, tall (T) is dominant to short (t). Two heterozygous tall plants (Tt) are crossed. What proportion of offspring are expected to be short?

A.1 in 4

B.1 in 2

C.3 in 4

D.None

Explanation: A Tt x Tt cross gives genotypes 1 TT : 2 Tt : 1 tt. Only tt plants are short, so 1 in 4 (25%) of offspring are expected to be short.

6Red-green colour blindness is an X-linked recessive condition. A carrier mother (X^A X^a) has children with a father who has normal vision (X^A Y). What is the chance that a son is colour blind?

A.0%

B.25%

C.50%

D.100%

Explanation: Sons receive their X from the mother. The carrier mother passes X^A or X^a with equal chance, so half of her sons (50%) are expected to be colour blind. Considering all children, 25% are colour-blind sons, but among sons the figure is 50%.

7In cattle, coat colour shows codominance: red (C^R C^R) crossed with white (C^W C^W) produces roan (C^R C^W) offspring with both red and white hairs. Two roan cattle are crossed. What phenotype ratio is expected in the offspring?

A.All roan

B.1 red : 2 roan : 1 white

C.3 roan : 1 white

D.1 red : 1 white

Explanation: A C^R C^W x C^R C^W cross gives 1 C^R C^R (red) : 2 C^R C^W (roan) : 1 C^W C^W (white). In codominance both alleles are fully expressed, so heterozygotes show both colours rather than a blend.

8Which statement best describes the role of meiosis in producing genetic variation?

A.It copies DNA exactly so offspring are identical

B.Crossing over and independent assortment shuffle alleles into gametes

C.It increases the chromosome number in gametes

D.It removes all recessive alleles from the population

Explanation: Meiosis generates variation through crossing over (exchange of segments between homologous chromosomes) and independent assortment (random orientation of homologous pairs). Random fertilisation adds further variation.

9Asexual reproduction in organisms such as bacteria and many plants tends to produce offspring that are:

A.Genetically identical to the parent

B.More variable than sexually produced offspring

C.Always haploid

D.Resistant to all environmental change

Explanation: Asexual reproduction involves a single parent and mitotic-type division, so offspring are clones that are genetically identical to the parent (apart from rare mutations). This gives low variation but allows rapid reproduction.

10Which feature of the DNA molecule allows it to be copied accurately during replication?

A.Its single-stranded structure

B.Complementary base pairing between A-T and G-C

C.Its lack of a sugar-phosphate backbone

D.The presence of uracil in both strands

Explanation: Because adenine always pairs with thymine and guanine with cytosine, each strand acts as a template for an exact complementary copy. This base-pairing rule underlies semi-conservative replication.

About the HSC Biology Exam

HSC Biology is a Stage 6 (Year 12) Board Developed Course in the NSW Higher School Certificate, examined by the NSW Education Standards Authority (NESA). The Year 12 course is built around four modules: Module 5 Heredity, Module 6 Genetic Change, Module 7 Infectious Disease and Module 8 Non-infectious Disease and Disorders, with Working Scientifically skills developed across all modules. The external written examination is worth 100 marks over 3 hours plus 5 minutes reading time, and is divided into Section I, twenty multiple-choice questions worth 20 marks, and Section II, short-answer and extended-response questions worth 80 marks. Modules 5-8 are given approximately equal weighting, and questions on Working Scientifically skills such as analysing data, interpreting graphs and evaluating evidence appear throughout. NESA-approved calculators may be used.

Assessment

Written examination of 100 marks in two sections. Section I: 20 objective-response (multiple-choice) questions worth 20 marks. Section II: 20 to 25 short-answer and extended-response items worth 80 marks, with at least two items worth 7 to 9 marks. Modules 5-8 carry approximately equal weighting; Working Scientifically skills are integrated throughout.

Time Limit

3 hours of working time plus 5 minutes reading time.

Passing Score

There is no fixed pass mark. Achievement is reported as a 0-100 HSC mark aligned to six performance bands. Band 6 (the highest band) is typically awarded for marks of 90 and above; Band 1 is the lowest.

Exam Fee

There is no separate examination fee; the HSC Biology exam is covered by the NESA HSC entry and course confirmation fee that NSW students pay for the Higher School Certificate. (NSW Education Standards Authority (NESA))

HSC Biology Exam Content Outline

22%

Module 5: Heredity

Sexual and asexual reproduction in plants and animals; cell replication through mitosis and meiosis; DNA structure, replication and the link between DNA, polypeptide synthesis (transcription and translation) and proteins; and inheritance, including monohybrid and codominance crosses, sex linkage and population genetics.

22%

Module 6: Genetic Change

Point and chromosomal mutations and mutagens; biotechnology and genetic technologies such as recombinant DNA, transgenic organisms, gene cloning, PCR and CRISPR; reproductive technologies; and how genetic variation, mutation and these technologies influence the evolution of species and biodiversity.

22%

Module 7: Infectious Disease

Pathogen types (bacteria, viruses, fungi, protozoa, prions, macroparasites); transmission, adhesion and Koch's postulates; plant and animal responses to pathogens; the innate and adaptive immune responses; and the prevention, treatment and control of infectious disease, including vaccination, antibiotics, public health and epidemiology.

22%

Module 8: Non-infectious Disease and Disorders

Homeostasis and negative feedback (thermoregulation, glucose and osmoregulation); causes and effects of nutritional, genetic and environmental non-infectious disease; epidemiology and the use of data to study these diseases; and technologies and disorders affecting the nervous system, hearing, vision and kidney function (such as dialysis and transplants).

12%

Working Scientifically

Questioning and predicting; planning and conducting valid, reliable investigations; processing and analysing data and information; problem solving; and communicating. In the exam this appears as data interpretation, reading graphs and tables, identifying controls and variables, and evaluating the reliability and validity of evidence in unfamiliar scenarios.

How to Pass the HSC Biology Exam

What You Need to Know

Passing score: There is no fixed pass mark. Achievement is reported as a 0-100 HSC mark aligned to six performance bands. Band 6 (the highest band) is typically awarded for marks of 90 and above; Band 1 is the lowest.
Assessment: Written examination of 100 marks in two sections. Section I: 20 objective-response (multiple-choice) questions worth 20 marks. Section II: 20 to 25 short-answer and extended-response items worth 80 marks, with at least two items worth 7 to 9 marks. Modules 5-8 carry approximately equal weighting; Working Scientifically skills are integrated throughout.
Time limit: 3 hours of working time plus 5 minutes reading time.
Exam fee: There is no separate examination fee; the HSC Biology exam is covered by the NESA HSC entry and course confirmation fee that NSW students pay for the Higher School Certificate.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

HSC Biology Study Tips from Top Performers

1Map your revision to the syllabus dot-points for each of Modules 5-8; HSC questions are written directly from the inquiry questions and content statements, so any gap in a dot-point is a likely lost mark.

2Practise interpreting unfamiliar graphs, tables and pedigrees under time pressure; Working Scientifically skills are integrated throughout the exam and often appear in the multiple-choice section.

3For Module 5, be able to trace the full pathway from DNA to protein (transcription and translation) and to solve monohybrid, codominance and sex-linked crosses using Punnett squares.

4For Modules 7 and 8, distinguish clearly between infectious and non-infectious disease, and between innate and adaptive immunity, and link each example to mechanisms, prevention and epidemiological data.

5Use NESA's past HSC papers and marking guidelines to learn how the directive verbs (describe, explain, assess, evaluate) shape the depth of answer expected, then apply that thinking to multiple-choice distractors too.

6When two multiple-choice options seem correct, choose the one most precisely supported by the data or stem; HSC distractors are often true statements that do not actually answer the question asked.

Frequently Asked Questions

How is the HSC Biology examination structured?

The written exam is worth 100 marks. Section I has 20 multiple-choice questions worth 20 marks, and Section II has 20 to 25 short-answer and extended-response items worth 80 marks, with at least two items worth 7 to 9 marks.

How long is the HSC Biology exam?

Students have 3 hours of working time plus 5 minutes of reading time. NESA-approved calculators may be used during the examination.

Which modules are examined in Year 12 HSC Biology?

The Year 12 course covers Module 5 Heredity, Module 6 Genetic Change, Module 7 Infectious Disease and Module 8 Non-infectious Disease and Disorders. The four modules carry approximately equal weighting, and Working Scientifically skills are integrated throughout.

Is there a pass mark for HSC Biology?

There is no fixed pass mark. Results are reported as a 0-100 HSC mark and on six performance bands. Band 6, the highest, is typically awarded for marks of 90 and above.

Does HSC Biology use the new 2025 syllabus?

No. The Biology Stage 6 (2017) syllabus with Modules 5-8 still applies to the Year 12 HSC in 2026. The new Biology 11-12 Syllabus (2025) is implemented from 2027, when it replaces the 2017 syllabus.

Are these official NESA HSC questions?

No. These are original OpenExamPrep questions modelled on the HSC multiple-choice style and the Stage 6 (2017) syllabus content. NESA publishes official past HSC papers and marking guidelines separately on its website.