Skip to content

Theoretical A

Start Timed Attempt → 🏆 Leaderboard

Theoretical A Exam Official Worked Solutions
Q1 Poiseuille's Law and Blood Pressure Regulation Cardiovascular Physiology IBO·2015·Q1 — ptsPDF
Q2 Anion Effects on Hemoglobin Oxygen Affinity Respiratory Physiology IBO·2015·Q2 — ptsPDF
Q3 Visual Field Deficits from Central Visual Pathway Lesions Nervous System Physiology IBO·2015·Q3 — ptsPDF
Q4 Hippocampal Plasticity in London Taxi Drivers Nervous System Physiology IBO·2015·Q4 — ptsPDF
Q5 Kidney Filtration, Excretion and Oxygen Use in Three Individuals Comparative Osmoregulation & Excretion IBO·2015·Q5 — ptsPDF
Q6 Vascular Adaptations Preventing Leg Oedema in Giraffes Cardiovascular Physiology IBO·2015·Q6 — ptsPDF
Q7 Vocalization Frequency and Body Size in Whales Animal Communication IBO·2015·Q7 — ptsPDF
Q8 Anaerobic Lactate-to-Ethanol Metabolism in Goldfish Digestive & Metabolic Physiology IBO·2015·Q8 — ptsPDF
Q9 Metabolic Rate Scaling During Flounder Development Digestive & Metabolic Physiology IBO·2015·Q9 — ptsPDF
Q10 The Coagulation Cascade and Vitamin K Cardiovascular Physiology IBO·2015·Q10 — ptsPDF
Q11 Temperature, Lactic Acid and Salbutamol Effects on Muscle Fatigue Muscle Physiology IBO·2015·Q11 — ptsPDF
Q12 Stevioside and Soy Protein Effects on Diabetic Rats Endocrine System Physiology IBO·2015·Q12 — ptsPDF
Q13 Countercurrent Heat Exchange in Thermoregulation Comparative Thermoregulation IBO·2015·Q13 — ptsPDF
Q14 C3 and C4 Leaf Anatomy and Climate Calvin Cycle, Photorespiration & C4/CAM Biochemistry IBO·2015·Q14 — ptsPDF
Q15 Chloroplast DNA Haplotypes in a Rare Japanese Orchid Genetic Drift, Gene Flow & Mutation IBO·2015·Q15 — ptsPDF
Q16 Nitrous Oxide Production by Bacteria in Zebra Mussels Ecology IBO·2015·Q16 — ptsPDF
Q17 An Adenosine Analogue as a Filovirus Therapeutic Nucleotide & Nucleic Acid Chemistry IBO·2015·Q17 — ptsPDF
Q18 The ABC Gene Model of Monocot Flower Development Flower Anatomy & Reproductive Structures IBO·2015·Q18 — ptsPDF
Q19 Electron Transport Between Oxic and Anoxic Marine Sediment Layers Ecology IBO·2015·Q19 — ptsPDF
Q20 Timing Gene Transfer During Bacterial Conjugation Linkage, Recombination & Genetic Mapping IBO·2015·Q20 — ptsPDF
Q21 Cholera Toxin Signaling and a CFTR Inhibitor Treatment Cell Signaling & Communication Plasma Membrane Structure & Transport IBO·2015·Q21 — ptsPDF
Q22 Adipose Tissue as a Host Response to Skin Infection Immune Physiology IBO·2015·Q22 — ptsPDF
Q23 Rhizobium Nodulation and Gene Structure in Lotus japonicus Transcription & RNA Processing IBO·2015·Q23 — ptsPDF
Q24 Competing Hypotheses for Darwin's Finch Diversification Coevolution & Species Interactions IBO·2015·Q24 — ptsPDF
Q25 Coevolutionary Arms Race Between Toxic Newts and Resistant Snakes Coevolution & Species Interactions IBO·2015·Q25 — ptsPDF
Q26 Indirect Effects of Introduced Arctic Foxes on Island Vegetation Ecology IBO·2015·Q26 — ptsPDF
Q27 Diet Differences Between Island and Mainland Chough Populations Ecology IBO·2015·Q27 — ptsPDF
Q28 Fruit Availability and Fish Diet Niche in Amazon Floodplains Ecology IBO·2015·Q28 — ptsPDF
Q29 Species Extinction on Islands Created by Reservoir Flooding Ecology IBO·2015·Q29 — ptsPDF
Q30 Orientation Cages and Migratory Direction in Indigo Buntings Orientation & Navigation IBO·2015·Q30 — ptsPDF
Q31 Wind Adaptation and Flightlessness in an Island Butterfly Natural Selection: Modes & Fitness IBO·2015·Q31 — ptsPDF
Q32 Stress Behaviour and Cortisol in Farmed Mink Mechanisms of Behavior Endocrine System Physiology IBO·2015·Q32 — ptsPDF
Q33 ABO Blood Group Compatibility in Transfusion Human Circulatory System IBO·2015·Q33 — ptsPDF
Q34 Environmental DNA and Acoustic Detection of Harbour Porpoises Molecular Systematics IBO·2015·Q34 — ptsPDF
Q35 Multi-Locus Blood Typing to Resolve a Paternity Case Pedigree Analysis & Human Genetic Disorders IBO·2015·Q35 — ptsPDF
Q36 A Frameshift Mutation Causing Ficolin-3 Deficiency Translation & the Genetic Code IBO·2015·Q36 — ptsPDF
Q37 Restriction Fragment Analysis of a Growth Hormone Deletion Pedigree Analysis & Human Genetic Disorders IBO·2015·Q37 — ptsPDF
Q38 A Pedigree with Two X-Linked Disorders Sex Determination & Sex-Linked Inheritance IBO·2015·Q38 — ptsPDF
Q39 Sex-Linked Plumage Colour Inheritance in Chickens Sex Determination & Sex-Linked Inheritance IBO·2015·Q39 — ptsPDF
Q40 Hardy-Weinberg and the Evolution of Lactose Tolerance Population Genetics & Hardy-Weinberg Equilibrium IBO·2015·Q40 — ptsPDF
Q41 Complementation Analysis of the Arginine Biosynthesis Pathway Gene Interactions: Epistasis & Complementation Analysis IBO·2015·Q41 — ptsPDF
Q42 Carrier Probability in an Autosomal Recessive Pedigree Pedigree Analysis & Human Genetic Disorders IBO·2015·Q42 — ptsPDF
Q43 Temperature and Invasive Algae Effects on Eelgrass Growth Plant Stress Physiology & Defense IBO·2015·Q43 — ptsPDF
Q44 Vegetation Removal and Permafrost Dynamics in Siberian Tundra Ecology IBO·2015·Q44 — ptsPDF
Q45 Sexual Dimorphism and Floral Evolution in Palm and Saxifrage Flower Anatomy & Reproductive Structures IBO·2015·Q45 — ptsPDF
Q46 Trade-offs Between Clonal and Sexual Reproduction in Bamboo Ecology IBO·2015·Q46 — ptsPDF
Q47 Prey-Induced Enzyme Activity in the Carnivorous Sundew Mineral Nutrition & Nutrient Uptake IBO·2015·Q47 — ptsPDF
Q48 CO2 and Temperature Effects on C3 versus C4 Photosynthesis Calvin Cycle, Photorespiration & C4/CAM Biochemistry IBO·2015·Q48 — ptsPDF
Q49 Heterostyly and Pollen Transfer Efficiency in Primrose Flower Anatomy & Reproductive Structures Population Genetics & Hardy-Weinberg Equilibrium IBO·2015·Q49 — ptsPDF