Namibia Senior Secondary Certificate Ordinary (NSSCO) Biology Syllabus Guide

Namibia Senior Secondary Certificate Ordinary (NSSCO) Level Biology Syllabus

• Syllabus Code: 6116
• Implementation Date: 2019 (First Examination in 2020)
• Target Grades: 10 and 11
• Authority: Republic of Namibia Ministry of Education, Arts and Culture; National Institute for Educational Development (NIED).
• Philosophy: Learner-centered education adhering to the National Curriculum for Basic Education (NCBE) and approved by the National Examination, Assessment and Certification Board (NEACB).
• Educational Context: Recognizes the uniqueness of the learner and promotes life-long learning. It addresses global issues such as the AIDS pandemic, global warming, environmental degradation, wealth distribution, conflict, and the technological explosion.
• Relevant Essential Skills:     * Communication skills*     * Numeracy skills*     * Information skills*     * Problem-solving skills*     * Self-management and competitive skills*     * Work and study skills*     * Critical and creative thinking skills*

Rationale and Broad Aims

• Rationale: Biology is a natural science emphasizing understanding of the physical and environmental world at local, regional, and international levels. It focuses on sustainable resource use, health applications for individuals and society, and the application of modern technology to solve problems through scientific investigation and critical thinking.
• Aims of the Syllabus:     * Provide experimental and practical science studies to develop confident citizens in a technological world.     * Prepare learners for further studies in pure sciences, applied sciences, or science-dependent vocational courses.     * Develop abilities relevant to the practice of Biology, including safe practice and effective communication.     * Foster attitudes such as concern for accuracy, precision, integrity, objectivity, and inventiveness.     * Promote awareness that science is a co-operative, universal activity subject to social, economic, and ethical influences.     * Stimulate interest in and care for the environment.

Administrative and Additional Information

• Guided Learning Hours: Approximately $130\,\text{hours}$ over two years. This translates to 8 periods of $40\,\text{minutes}$ per 7-day cycle or 6 periods of $40\,\text{minutes}$ per 5-day cycle.
• Prior Learning: It is recommended that learners have studied Life Science at the Junior Secondary (JS) level.
• Progression: Achievement of grades $C$ to $A^*$ prepares learners for Namibia Senior Secondary Certificate Advanced Subsidiary (NSSCAS) level Biology.
• Grading Scale: Grades are awarded from $A$, $B$, $C$, $D$, $E$, $F$, to $G$. An "Ungraded" result indicates failure to reach the minimum pass standard.

Topic 1: Scientific Processes

• Mathematical Requirements:     * Perform arithmetic: add, subtract, multiply, divide.     * Use averages, decimals, fractions, percentages, ratios, and reciprocals.     * Use instruments: ruler, compasses, protractor, set square.     * Recognize direct and inverse proportion.     * Use positive, whole number indices.     * Solve linear equations: $x = y + z$ and $x = yz$.

• Scientific Skills and Planning:     * Make accurate observations and handle apparatus safely.     * Distinguish variables: independent, dependent, and constant.     * State hypotheses in relation to variables.     * Record data logically in tables or graphs with appropriate units.

• Graphing and Data Presentation:     * Independent variable on the x-axis (horizontal); dependent variable on the y-axis (vertical).     * Axes labeling: physical quantity followed by a solidus and unit (e.g., $\text{time/s}$).     * Plots: Crosses ($x$) or encircled dots ($\odot$). If a second curve is used, vertical crosses ($+$) are acceptable.     * Heading convention: Dependent versus Independent variable.

• Units and Notation:     * Use SI units and derived units.     * Prefixes: kilo, deci, centi, milli, micro.     * Notation examples: $\text{metres per second}$, $\text{m per s}$, $\text{m/s}$, or $\text{ms}^{-1}$.

• Error and Accuracy:     * Identify sources of random and systematic errors.     * Analyse anomalous results and suggest procedural improvements.     * Calculate magnification: $\text{Magnification} = \frac{\text{size of image}}{\text{size of real object}}$.

Topic 2: Classification and Diversity of Living Organisms

• Classification Systems:     * Hierarchical system: Kingdom, Phylum, Class, Order, Family, Genus, Species.     * Binomial System: Two-part scientific name consisting of Genus (capitalized) and species (lowercase), e.g., $\textit{Homo sapiens}$.     * Dichotomous Keys: Used to identify organisms based on visible features.

• Diversity Groups:     * Viruses: Structure limited to protein coat and genetic material; debate over status as living organisms.     * Five Kingdoms: Prokaryotes (bacteria), Protoctists (algae/protozoa), Fungi, Plants, and Animals.     * Specific Groups for Classification: Flowering plants (monocotyledons vs. dicotyledons), Molluscs, Annelids, Arthropods (insects, arachnids, crustaceans, myriapods), and Vertebrates (fish, amphibians, reptiles, birds, mammals).

Topic 3: Organisation and Maintenance of the Organism

• Cell Structure:     * Plant cells (palisade) vs. Animal cells (liver): cell membrane, cell wall, cytoplasm, nucleus, vacuoles, and chloroplasts.     * Organelles: Mitochondria (energy release), ribosomes (protein synthesis), rough endoplasmic reticulum, and vesicles.     * Levels of Organisation: Cells $\rightarrow$ Tissues $\rightarrow$ Organs $\rightarrow$ Organ Systems $\rightarrow$ Organism.

• Movement of Substances:     * Diffusion: Random movement of particles from high to low concentration using kinetic energy. Influenced by surface area, temperature, concentration gradient, and distance.     * Osmosis: Diffusion of water through a partially permeable membrane. Terms: water potential, turgid, flaccid, plasmolysis, turgor pressure, hypotonic, isotonic, and hypertonic.     * Active Transport: Movement against a concentration gradient using energy from respiration and membrane protein carriers.

• Biological Molecules:     * Synthesis: Sugars to starch/glycogen; amino acids to proteins; fatty acids/glycerol to fats/oils.     * DNA Structure: Double helix with two strands; base pairs $A$ with $T$, and $C$ with $G$.     * Chemical Tests:         * Reducing sugars: Benedict’s solution.         * Starch: Iodine solution.         * Proteins: Biuret test.         * Fats/Oils: Ethanol emulsion test.         * Vitamin C: DCPIP test.

• Enzymes:     * Biological catalysts (proteins) that increase reaction rates.     * Mechanism: Active site, enzyme-substrate complex, substrate, and product.     * Factors: Temperature and pH (denaturation occurs when the shape is altered).

• Plant Nutrition (Photosynthesis):     * Balanced Equation: $6\text{CO}_2 + 6\text{H}_2\text{O} \xrightarrow[\text{chlorophyll}]{\text{light}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$     * Leaf Structure: Palisade mesophyll (chloroplasts), stomata (gas exchange), vascular bundles (xylem/phloem).     * Limiting Factors: Light intensity, $\text{CO}_2$ concentration, and temperature.     * Minerals: Nitrate (amino acids/proteins), Magnesium (chlorophyll), Phosphate, and Iron.

• Human Nutrition:     * Alimentary Canal Functions: Ingestion, Mechanical/Chemical Digestion, Absorption, and Egestion.     * Cholera: Bacterium produces a toxin causing chloride ion secretion into the small intestine, leading to osmotic water loss (diarrhea/dehydration).     * Specific Diet Needs: Variable based on age, gender, activity level, and status (pregnancy/nursing/HIV/AIDS).     * Vitamins/Minerals: Deficiencies in Vit A, D, C, Iodine, and Iron.

• Transport Systems:     * Plants: Xylem (water/minerals), Phloem (translocation of sucrose/amino acids). Transpiration is water loss from mesophyll surfaces.         * Xerophytes: Adaptations like those in $\textit{Aloe}$, $\textit{Euphorbia}$, and Quiver trees to reduce water loss.     * Animals: Double circulatory system. Heart structure includes chambers and valves.         * Blood components: Red cells ($\text{O}_2$ transport), White cells (phagocytes/lymphocytes for defense), Platelets (clotting - fibrinogen to fibrin), Plasma.         * Treatment of CHD: Aspirin, stents, angioplasty, bypass surgery.

• Respiration and Gas Exchange:     * Aerobic Respiration: $\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{Energy}$.     * Anaerobic Respiration (Muscles): $\text{Glucose} \rightarrow \text{Lactic acid}$.     * Anaerobic Respiration (Yeast): $\text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 2\text{C}_2\text{H}_5\text{OH} + 2\text{CO}_2$.     * Gas Exchange: Alveoli features (thin, large surface area, good blood supply).

• Co-ordination and Control:     * Nervous System: Neurones (motor, relay, sensory), synapses (neurotransmitter transmission), reflex arcs.     * Eye: Cornea, iris, pupil, lens, retina (rods/cones), optic nerve. Pupil reflex and accommodation.     * Hormones: Adrenaline, Insulin, Glucagon, Testosterone, Oestrogen.     * Homeostasis: Negative feedback; temperature regulation (shivering, sweating, vasodilation/vasoconstriction).

Topic 4: Development of the Organism and Continuity of Life

• Cell Division:     * Mitosis: Nuclear division producing genetically identical diploid cells for growth, repair, and asexual reproduction.     * Meiosis: Reduction division producing genetically different haploid gametes.

• Reproduction:     * Asexual: One parent, identical offspring (bacteria, fungi spores, potato tubers).     * Sexual: Fusion of haploid gamete nuclei to form a diploid zygote.     * Pollination: Self-pollination vs. Cross-pollination; Insect-pollinated vs. Wind-pollinated flowers.

• Human Reproduction:     * Hormones: FSH, LH, Progesterone, Oestrogen control the menstrual cycle and pregnancy.     * Development: Placenta and umbilical cord for exchange; labor and birth processes.     * Birth Control Methods: Natural (abstinence), Chemical (pill, IUD), Barrier (condom, diaphragm), Surgical (vasectomy).     * STIs: HIV transmission, prevention, and Namibian socio-economic impacts.

• Inheritance:     * Definitions: Genotype (alleles), Phenotype (features), Homozygous (identical alleles), Heterozygous (different alleles), Dominant vs. Recessive.     * Monohybrid Crosses: Expect ratios like $1:1$ or $3:1$.     * Co-dominance: Example of AB blood groups.     * Mutation: Change in DNA base sequence (e.g., Down’s syndrome, Sickle-cell anaemia).

• Evolution and Selection:     * Natural Selection: Survival of the best adapted (e.g., antibiotic-resistant bacteria).     * Artificial Selection: Selective breeding for economic importance.

Topic 5: Relationship of Organisms with One Another and Environment

• Ecology Concepts:     * Trophic Levels: Producers, Primary/Secondary/Tertiary Consumers, Decomposers.     * Energy Flow: Non-cyclical transfer (usually < 5 levels due to energy loss).     * Pyramids of Biomass and Numbers.     * Cycles: Carbon cycle (photosynthesis, combustion) and Nitrogen cycle (nitrification, nitrogen fixation, denitrification).

• Populations:     * Sigmoid growth curve (Lag, Log, Stationary phases) influenced by limiting factors.     * Ecosystem: Community (different species) interacting with the environment.

• Human Influence and Conservation:     * Habitat Destruction: Deforestation and leaching.     * Pollution: Eutrophication (sewage/fertilizers), acid rain, and non-biodegradable plastics.     * Conservation: Maintenance of biodiversity; sustainable development (managing fish stocks and forests via quotas).     * Nambia-Specific Issue: Impact of Rhinoceros poaching on tourism.

Scheme of Assessment

• Assessment Objectives (AO):     * AO A (47%): Knowledge with understanding.     * AO B (28%): Handling information, application, and problem solving.     * AO C (25%): Practical skills and abilities.

Glossary of Selected Directives

• Calculate: Requires a numerical answer; working should be shown.
• Define: Provide a formal statement or equivalent paraphrase.
• Describe: Enumerate the main points (may use diagrams).
• Determine: Usually implies the quantity is obtained by calculation or from a graph, not direct measurement.
• Explain: Requires reasoning or reference to theory to show why something happens.
• Predict: Make a logical connection between pieces of information to state a future outcome (not by recall).
• Suggest: Implies no unique answer or requires applying knowledge to a 'novel' situation.