Matric Life Sciences Study Guide 2026 | Complete NSC Exam Prep

Quick Answer: This guide covers all Paper 1 (Cell Biology, Physiology) and Paper 2 (Genetics, Evolution, Ecology) topics for the 2026 NSC Life Sciences exam, with a 7-week study plan, diagram guidance, and strategies for genetics problems and written questions.

Your Complete Matric Life Sciences Study Guide for 2026

Life Sciences is a conceptually rich subject covering everything from sub-cellular biology to evolution and ecology. This guide breaks down every major topic across both papers, explains what markers look for in written answers, and gives you a proven revision strategy.

Exam Structure

Paper	Duration	Marks	Focus
Paper 1	2.5 hours	150	Life at the Molecular, Cellular and Tissue Level; Plant and Animal Nutrition; Gaseous Exchange; Excretion; Support and Transport
Paper 2	2.5 hours	150	Genetics and Inheritance; Evolution and Biodiversity; Biosphere to Ecosystems; Human Impact on the Environment

Both papers have a multiple-choice Section A (30 marks) and structured or essay questions in Sections B and C.

Paper 1 Topics

1. Biochemistry -- The Chemistry of Life

• Organic molecules: carbohydrates, lipids, proteins -- structure and function
• Enzymes: structure, substrate specificity, active site, lock-and-key model, induced fit; factors affecting enzyme activity (temperature, pH, substrate concentration)
• ATP and energy: role of ATP in cellular processes; structure of ATP

2. Cell Biology

• Cell structure: prokaryotic vs eukaryotic; organelles and their functions (mitochondria, chloroplast, ribosome, Golgi apparatus, ER, nucleus)
• Membrane structure: fluid mosaic model; phospholipid bilayer
• Transport across membranes: diffusion, osmosis, active transport, endocytosis, exocytosis
• DNA structure and replication: double helix; base pairing (A-T, G-C); semi-conservative replication
• Protein synthesis: transcription (DNA to mRNA), translation (mRNA to protein); codons and anticodons
• Cell division: mitosis (PMAT phases; purpose: growth and repair); meiosis (produces haploid gametes; sources of genetic variation)

3. Plant Nutrition (Photosynthesis)

• Light reactions (in thylakoids): photolysis of water, production of ATP and NADPH, release of oxygen
• Calvin cycle (dark reactions) (in stroma): CO2 fixation, production of glucose using ATP and NADPH
• Factors affecting the rate of photosynthesis: light intensity, CO2 concentration, temperature
• Leaf structure and adaptations for photosynthesis

4. Animal Nutrition

• Human digestive system: mechanical and chemical digestion; role of each organ
• Enzymes in digestion: amylase, pepsin, lipase -- their substrates, products, and optimal pH
• Absorption: villi and microvilli; role of lymphatic system (lacteals)

5. Gaseous Exchange

• Respiratory surfaces in insects, fish, and mammals
• Human breathing mechanism: diaphragm and intercostal muscles; negative pressure breathing
• Gas exchange in the alveoli: structural adaptations; diffusion gradients
• Lung diseases: asthma, emphysema, tuberculosis -- causes and effects on gas exchange

6. Excretion

• Functions of the kidneys: filtration, reabsorption, secretion, osmoregulation
• Nephron structure and function: Bowman's capsule, loop of Henle, distal convoluted tubule, collecting duct
• Role of ADH in water balance
• Liver functions: deamination, urea production, glycogen storage, bile production

7. Support and Transport

• Plant transport: xylem (water and minerals via transpiration stream) and phloem (sugars via translocation)
• Human circulatory system: double circulation; heart structure; cardiac cycle; blood pressure
• Blood components: red blood cells (haemoglobin); white blood cells (immunity); platelets; plasma
• Immunity: non-specific vs specific; antibodies and antigens; vaccination

Paper 2 Topics

1. Genetics and Inheritance

• Terminology: gene, allele, genotype, phenotype, homozygous, heterozygous, dominant, recessive
• Monohybrid crosses: Punnett squares; predicting offspring ratios
• Incomplete dominance and co-dominance: predict and explain intermediate or mixed phenotypes
• Sex-linked inheritance: X-linked traits; haemophilia, colour blindness as examples
• Mutations: types (gene and chromosomal); causes (mutagens); effects
• DNA fingerprinting and genetic engineering: PCR, gel electrophoresis, transgenic organisms

Exam tip: Always show your Punnett square in crosses -- it earns method marks even if you make a calculation error elsewhere.

2. Evolution and Biodiversity

• Darwin's theory: natural selection; variation; survival of the fittest; adaptation
• Evidence for evolution: fossil record, comparative anatomy (homologous and analogous structures), biochemical evidence, geographical distribution
• Types of speciation: allopatric (geographical isolation) and sympatric speciation
• Classification: taxonomy; binomial nomenclature; domains and kingdoms

3. Biosphere to Ecosystems

• Levels of organisation: biosphere, biome, ecosystem, community, population, organism
• Food chains and food webs; producers, consumers, decomposers
• Energy flow: 10% rule; energy pyramids
• Nutrient cycles: carbon cycle, nitrogen cycle
• Population ecology: carrying capacity, limiting factors, S-shaped growth curve

4. Human Impact on the Environment

• Pollution: air, water, soil -- causes, effects, control measures
• Loss of biodiversity: habitat destruction, alien invasive species, overexploitation
• Conservation: in situ vs ex situ; national parks, seed banks
• Global warming and climate change: greenhouse effect; carbon dioxide and methane

How to Answer Life Sciences Questions

Definitions

Learn exact definitions. A "near enough" definition often loses marks. When defining a process, include: what happens, where it happens, and what the product or result is.

Diagrams

• Draw clearly with a ruler; label with straight lines (not arrows)
• Study past paper diagrams: nephron, alveolus, mitosis stages, heart structure
• Know the difference between a cross-section diagram and a flow diagram

Written Explanations

• Use cause, mechanism, effect structure
• Be specific: say "the concentration gradient of glucose across the cell membrane" not just "the concentration gradient"
• Use technical vocabulary -- it signals understanding to the marker

7-Week Study Plan

Week	Paper 1 Focus	Paper 2 Focus
1	Biochemistry + Enzymes	DNA structure + Protein synthesis
2	Cell division (Mitosis and Meiosis)	Genetics -- Monohybrid and sex-linked
3	Photosynthesis + Nutrition	Mutations + Genetic engineering
4	Gaseous exchange + Excretion	Evolution -- evidence and mechanisms
5	Support + Transport (plant and human)	Ecosystems + Nutrient cycles
6	Full P1 past paper	Human impact + Full P2 past paper
7	Targeted revision of weak topics + Final past papers

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