Second stage of the Science Olympiad programme: the Indian National Biology Olympiad (INBO), a written examination. INBO paper: written, 2 hours. Its syllabus is broadly equivalent to that of NSEB, at the level of senior secondary (up to and including Class 12) of CBSE; questions are usually non-conventional and of high difficulty.
Biology9 topic groups
I. Diversity of Living Organisms
The Living World: What is living? Biodiversity; Need for classification; three domains of life; taxonomy and systematics; concept of species and taxonomical hierarchy; binomial nomenclature and tools for study of taxonomy; Biological Classification: Five kingdom classification; Salient features and classification of Monera, Protista and Fungi into major groups: Lichens, Viruses and Viroids; Plant Kingdom: Salient features and classification of plants into major groups - Algae, Bryophyta, Pteridophyta, Gymnospermae and Angiospermae; Animal Kingdom: Salient features and classification of animals, non-chordates up to phyla level and chordates up to class level
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit I
II. Structural Organization in Animals and Plants
Morphology and anatomy of Flowering Plants: Morphology and modifications: Morphology of different parts of flowering plants: root, stem, leaf, inflorescence, flower, fruit and seed. Anatomy and functions of different tissues and tissue systems; Structural Organisation in Animals: Animal tissues; Morphology, anatomy and functions of different systems (digestive, circulatory, respiratory, nervous and reproductive) of animals
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit II
III. Cell: Structure and Function
Cell-The Unit of Life: Cell theory and cell as the basic unit of life: Structure of prokaryotic and eukaryotic cells; Plant cell and animal cell; cell envelope; cell membrane, cell wall; structure and function of all cell organelles. Cellular respiration - glycolysis, fermentation (anaerobic), TCA cycle and electron transport system (aerobic); energy relations - number of ATP molecules generated; amphibolic pathways; respiratory quotient; Biomolecules: Chemical constituents of living cells: biomolecules, structure and function of proteins, carbohydrates, lipids, nucleic acids; Enzymes- types, properties, enzyme action; Cell Cycle and Cell Division: Cell cycle, mitosis, meiosis and their significance
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit III
IV. Plant Physiology
Transport in Plants: Movement of water, gases and nutrients; cell to cell transport, diffusion, facilitated diffusion, active transport; plant-water relations, imbibition, water potential, osmosis, plasmolysis; long distance transport of water - Absorption, apoplast, symplast, transpiration pull, root pressure and guttation; transpiration, opening and closing of stomata; Uptake and translocation of mineral nutrients - Transport of food, phloem transport, mass flow hypothesis; Mineral Nutrition: Essential minerals, macro- and micronutrients and their role; deficiency symptoms; mineral toxicity; elementary idea of hydroponics as a method to study mineral nutrition; nitrogen metabolism, nitrogen cycle, biological nitrogen fixation; Photosynthesis and Respiration in Higher Plants: Photosynthesis as a means of autotrophic nutrition; site of photosynthesis, pigments involved in photosynthesis (elementary idea); photochemical and biosynthetic phases of photosynthesis; cyclic and non-cyclic photophosphorylation; chemiosmotic hypothesis; photorespiration; C3 and C4 pathways; factors affecting photosynthesis; exchange of gases; Plant - Growth and Development: Seed germination; phases of plant growth and plant growth rate; conditions of growth; differentiation, dedifferentiation and redifferentiation; sequence of developmental processes in a plant cell; growth regulators; seed dormancy; vernalisation; photoperiodism
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit IV
V. Human Physiology
Digestion and Absorption: Alimentary canal and digestive glands, role of digestive enzymes and gastrointestinal hormones; Peristalsis, digestion, absorption and assimilation of proteins, carbohydrates and fats; calorific values of proteins, carbohydrates and fats; egestion; nutritional and digestive disorders; Breathing and Exchange of Gases: Respiratory system in humans; mechanism of breathing and its regulation in humans - exchange of gases, transport of gases and regulation of respiration, respiratory volume; disorders related to respiration; Body Fluids and Circulation: Composition of blood, blood groups, coagulation of blood; composition of lymph and its function; human circulatory system - Structure of human heart and blood vessels; cardiac cycle, cardiac output, ECG; double circulation; regulation of cardiac activity; disorders of circulatory system; Excretory Products and Their Elimination: Modes of excretion - ammonotelism, ureotelism, uricotelism; human excretory system – structure and function; urine formation, osmoregulation; regulation of kidney function - renin - angiotensin, atrial natriuretic factor, ADH and diabetes insipidus; role of other organs in excretion; disorders of excretory system; dialysis and artificial kidney, kidney transplant; Locomotion and Movement: Types of movement - ciliary, flagellar, muscular; skeletal muscle- contractile proteins and muscle contraction; skeletal system and its functions; joints; disorders of muscular and skeletal system; Neural Control and Coordination: Neuron and nerves; Nervous system in humans - central nervous system; peripheral nervous system and visceral nervous system; generation and conduction of nerve impulse; reflex action; sensory perception; structure and functions of sense organs; Chemical Coordination and Integration: Endocrine glands and hormones; human endocrine system; mechanism of hormone action; role of hormones as messengers and regulators, hypo - and hyperactivity and related disorders
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit V
VI. Reproduction
Reproduction in Organisms: Reproduction, a characteristic feature of all organisms for continuation of species; modes of reproduction - asexual and sexual reproduction; asexual reproduction - binary fission, sporulation, budding, gemmule formation, fragmentation; vegetative propagation in plants; Sexual Reproduction in Flowering Plants: Flower structure; development of male and female gametophytes; pollination - types, agencies and examples; outbreeding devices; pollen-pistil interaction; double fertilization; post fertilization events - development of endosperm and embryo, development of seed and formation of fruit; special modes- apomixis, parthenocarpy, polyembryony; Significance of seed dispersal and fruit formation; Human Reproduction: Male and female reproductive systems; microscopic anatomy of testis and ovary; gametogenesis - spermatogenesis and oogenesis; menstrual cycle; fertilisation, embryo development upto blastocyst formation, implantation; pregnancy and placenta formation; parturition; lactation; Reproductive Health: Need for reproductive health and prevention of Sexually Transmitted Diseases (STDs); birth control - need and methods, contraception and medical termination of pregnancy (MTP); amniocentesis; infertility and assisted reproductive technologies - IVF, ZIFT, GIFT
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit VI
VII. Genetics and Evolution
Heredity and variation: Mendelian inheritance; deviations from Mendelism – incomplete dominance, co- dominance, multiple alleles and inheritance of blood groups, pleiotropy; elementary idea of polygenic inheritance; chromosome theory of inheritance; chromosomes and genes; Sex determination - in humans, birds and honey bee; linkage and crossing over; sex linked inheritances; Mendelian disorders in humans; Molecular Basis of Inheritance: DNA as genetic material; Structure of DNA and RNA; DNA packaging; DNA replication; Central dogma; transcription, genetic code, translation; gene expression and regulation - lac operon; Genome; DNA fingerprinting; Evolution: Origin of life; biological evolution and evidences for biological evolution (paleontology, comparative anatomy, embryology and molecular evidences); Darwin's contribution, modern synthetic theory of evolution; mechanism of evolution - variation (mutation and recombination) and natural selection with examples, types of natural selection; Gene flow and genetic drift; Hardy - Weinberg's principle; adaptive radiation; human evolution
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit VII
VIII. Biology and Human Welfare
Human Health and Diseases: Pathogens; parasites causing human diseases (malaria, dengue, chikungunya, filariasis, ascariasis, typhoid, pneumonia, common cold, amoebiasis, ringworm) and their control; Basic concepts of immunology - vaccines; cancer, HIV and AIDS; Adolescence - drug and alcohol abuse; Strategies for Enhancement in Food Production: Improvement in food production: Plant breeding, tissue culture, single cell protein, Biofortification, Apiculture and Animal husbandry; Microbes in Human Welfare: In household food processing, industrial production, sewage treatment, energy generation and microbes as bio-control agents and bio-fertilizers. Antibiotics; production and judicious use; Biotechnology – Principles, processes and applications: Genetic Engineering (Recombinant DNA Technology); Application of biotechnology in health and agriculture: Human insulin and vaccine production, stem cell technology, gene therapy; genetically modified organisms - Bt crops; transgenic animals; biosafety issues, bio piracy and patents
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit VIII
IX. Ecology and Environment
Organisms and Populations: Organisms and environment: Habitat and niche, population and ecological adaptations; population interactions - mutualism, competition, predation, parasitism; population attributes - growth, birth rate and death rate, age distribution; Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy; nutrient cycles; ecological succession; carbon fixation, pollination, seed dispersal; Biodiversity and its Conservation: Biodiversity-Concept, patterns, importance; loss of biodiversity; biodiversity conservation; hotspots, endangered organisms and extinction; Environmental Issues: Air pollution and its control; water pollution and its control; agrochemicals and their effects; solid waste management; radioactive waste management; greenhouse effect and climate change impact and mitigation; ozone layer depletion; deforestation
Read from: Syllabus - Olympiads (HBCSE), 'Biology' tab, unit IX
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Olympiads - Homi Bhabha Centre for Science Education
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Official website · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2026 · checked 5 Oct 2026
Opened https://olympiads.hbcse.tifr.res.in/ on 2026-10-05; it is the Olympiads site of HBCSE (TIFR) and links the Syllabus, Olympiad Books, Information Brochures, Stages and Past papers pages and the 2026-2027 Mathematical and Science Olympiad pages.
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Syllabus - Olympiads (HBCSE)
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Syllabus · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2026 · checked 5 Oct 2026
Opened https://olympiads.hbcse.tifr.res.in/how-to-prepare/syllabus/ on 2026-10-05 and read its text. The page carries the 'Syllabus for National Standard Examination and Indian National Olympiad in Physics, Chemistry, Biology, Astronomy and Junior Science' (tabs Biology, Chemistry, Physics, Astronomy, Junior Science) and a 'Mathematical Olympiad' tab. Every topic list in this file was cut from that page text and compared back with it (lower-case letters and digits only, ignoring spacing): every unit title and every topic phrase occurs in the page text. Not compared: the page as rendered (images); the lists of recommended books on the Mathematical tab are not syllabus and are not copied.
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Science Olympiad Brochure 2026-27 (English)
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Exam scheme / pattern · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2026 · checked 5 Oct 2026
Downloaded the 32-page PDF linked from https://olympiads.hbcse.tifr.res.in/science-olympiad-2026-2027/ on 2026-10-05 and read its text layer. It describes Stage I (National Standard Examination), Stage II (Indian National Olympiads, p. 15), Stage III (Orientation-Cum-Selection Camps, p. 16), Stage IV (training at HBCSE, p. 20) and Stage V (international Olympiads, p. 20). The statements recorded in this file (stage names, what a camp does, the INO duration and the syllabus level) were each checked against those pages. Dates, venues, quotas and fees on those pages are not copied.
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INBO 2025 - Question paper (Hindi)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2025 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (Hindi)' for 2025. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2025 - Question paper (English)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2025 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (English)' for 2025. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2025 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2025 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2025. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2025 - Answer booklet
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2025 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Answer Booklet' for 2025. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2024 - Question paper (English)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2024 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (English)' for 2024. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2024 - Question paper (Hindi)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2024 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (Hindi)' for 2024. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2024 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2024 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2024. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2024 - Answer booklet
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2024 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Answer Booklet' for 2024. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2023 - Question paper (English)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2023 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (English)' for 2023. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2023 - Question paper (Hindi)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2023 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (Hindi)' for 2023. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2023 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2023 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2023. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2022 - Question paper (English)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2022 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (English)' for 2022. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2022 - Question paper (Hindi)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2022 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (Hindi)' for 2022. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2022 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2022 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2022. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2021 - Question paper (English)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2021 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (English)' for 2021. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2021 - Question paper (Hindi)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2021 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (Hindi)' for 2021. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2021 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2021 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2021. Reachability checked on 2026-10-06: HTTP 206, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2020 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2020 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2020. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2020 - Question paper (English)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2020 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (English)' for 2020. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2020 - Question paper (Hindi)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2020 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (Hindi)' for 2020. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2019 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2019 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2019. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2019 - Question paper (Hindi)
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2019 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (Hindi)' for 2019. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2019 - Question paper (English)
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2019 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'QP (English)' for 2019. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2018 - Question paper
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2018 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2018. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2018 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2018 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2018. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2017 - Question paper
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2017 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2017. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2017 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2017 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2017. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2016 - Question paper
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2016 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2016. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2016 - Solutions
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2016 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2016. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2015 - Question paper
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Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2015 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2015. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2015 - Solutions
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2015 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2015. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2014 - Question paper
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2014 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2014. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2014 - Solutions
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2014 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2014. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2013 - Question paper
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2013 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2013. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2013 - Solutions
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2013 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2013. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2012 - Question paper
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2012 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2012. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2012 - Solutions
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2012 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2012. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2011 - Solutions
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2011 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2011. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2011 - Question paper
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2011 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2011. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2010 - Question paper
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2010 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2010. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2010 - Solutions
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2010 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2010. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2009 - Question paper
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2009 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2009. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2009 - Solutions
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2009 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Model Solutions' for 2009. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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INBO 2005 - Question paper
Opened; part could not be confirmed
Sample / previous-year papers · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2005 · checked 6 Oct 2026
Listed on HBCSE's Past papers page (https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/), Biology tab, as 'Question Paper' for 2005. Reachability checked on 2026-10-06: HTTP 200, application/pdf. The file's contents were not read: this is a link to the official paper, not a copy, and nothing in it is used as a source of the syllabus.
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Olympiad Books - Olympiads (HBCSE)
Verified against the document
Prescribed / recommended reading (published by the body) · Homi Bhabha Centre for Science Education (HBCSE), Tata Institute of Fundamental Research · 2026 · checked 5 Oct 2026
Opened https://olympiads.hbcse.tifr.res.in/how-to-prepare/olympiad-books/ on 2026-10-05; it lists the books HBCSE sells or recommends for the Science and Mathematical Olympiads (INPhO, INChO, INBO, INAO problem books, experimental problem books, and the Mathematical Olympiad books). It is a book list, not a syllabus, and no chapter cites it.