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AHSEC Biology Syllabus 2025-26: Assam HS 1st & 2nd Year PDF Download
The Assam Higher Secondary Education Council will prescribe the AHSEC Biology syllabus 2025-26 online. Students can view the syllabus in PDF format by visiting the official website at ahsec.assam.gov.in. The Biology subject is divided into Group A and Group B for the Assam AHSEC syllabus, i.e., Botany and Zoology, respectively. The board is yet to release the AHSEC Assam syllabus for the academic year 2025-26. Students can check out the 2024-25 syllabus till the new syllabus is available.
This Story also Contains
- AHSEC HS First Year Biology Syllabus: Unit & Chapter-Wise
- AHSEC HS Biology Final Year Syllabus: Unit & Chapter-Wise
- Detailed Syllabus of AHSEC Biology Syllabus 2025-26 (First Year)
- Detailed Syllabus of AHSEC Biology Syllabus 2025-26 (Final Year)
Candidates who are appearing for the Assam AHSEC board examination need to prepare both groups, botany and zoology, with at least 30 marks to pass the exam. Structural organisation in plants & animals, cell structure and its function, plant and human physiology, reproduction, genetics, biotechnology, ecology, etc., are some of the important units Assam HS biology 2025-26 syllabus. Read the article to learn more about the AHSEC Biology syllabus 2025–26.
Overview of AHSEC Assam Syllabus 2025-26 Biology
Contents | First-Year | Final-Year |
Total Units | 5 units | 5 units |
Total Chapters | 19 chapters | 14 chapters |
Theory marks |
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Practical marks |
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Total marks | 100 marks | 100 marks |
AHSEC HS First Year Biology Syllabus: Unit & Chapter-Wise
Higher Secondary First Year Syllabus | |
Unit Name | Chapters Included |
Unit I: Diversity in the Living World | Chapter 1 - The Living World (Botany) |
Chapter 2 - Biological Classification (Botany) | |
Chapter 3 - Plant Kingdom (Botany) | |
Chapter 4 - Animal Kingdom (Zoology) | |
Unit II: Structural Organisation in Plants & Animals | Chapter 5 - Morphology of Flowering Plants (Botany) |
Chapter 6 - Anatomy of Flowering Plants (Botany) | |
Chapter 7 - Structural Organisation in Animals (Zoology) | |
Unit III: Cell-Structure & Function | Chapter 8 - The Unit of Life (Botany) |
Chapter 9 - Biomolecules (Botany) | |
Chapter 10 - Cell Cycle and Cell Division (Botany) | |
Unit IV: Plant Physiology | Chapter 11 - Photosynthesis in Higher Plants (Botany) |
Chapter 12 - Respiration in Plants (Botany) | |
Chapter 13 - Plant Growth & Development (Botany) | |
Unit V: Human Physiology | Chapter 14 - Breathing & Exchange of Gases (Zoology) |
Chapter 15 - Body Fluids & Circulation (Zoology) | |
Chapter 16 - Excretory Products & Their Elimination (Zoology) | |
Chapter 17 - Locomotion & Movement (Zoology) | |
Chapter 18 - Neural Control & Coordination (Zoology) | |
Chapter 19 - Chemical Coordination & Integration (Zoology) | |
AHSEC HS Biology Final Year Syllabus: Unit & Chapter-Wise
Higher Secondary Final Year Syllabus | |
Unit VI: Sexual Reproduction | Chapter 1 - Sexual Reproduction in Flowering Plants (Botany) |
Chapter 2 - Human Reproduction (Zoology) | |
Chapter 3 - Reproductive Health (Zoology) | |
Unit VII: Genetics & Evolution | Chapter 4 - Principles of Inheritance & Variation (Zoology) |
Chapter 5 - Molecular Basis of Inheritance (Zoology) | |
Chapter 6 - Evolution (Botany) | |
Unit VIII: Biology in Human Welfare | Chapter 7 - Human Health & Diseases (Zoology) |
Chapter 8 - Microbes in Human Welfare (Botany) | |
Unit IX: Biotechnology | Chapter 9 - Biolotechnology; Principles & Processes (Botany) |
Chapter 10 - Biolotechnology & Its Application (Botany) | |
Unit X: Ecology | Chapter 11 - Organisms & Populations (Zoology) |
Chapter 12 - Ecosystems (Botany) | |
Chapter 13 - Biodiversity & Conservation (Zoology) | |
Chapter 14 - Bioresources of Assam (Botany, Zoology) | |
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Detailed Syllabus of AHSEC Biology Syllabus 2025-26 (First Year)
Students can check out the detailed contents of the Assam HS first-year syllabus 2024-25 for the Biology subject. We will update the contents of the chapters once the new syllabus is available. Check out the unit names and chapter-wise syllabus in the sections below.
Unit I: Diversity in the Living World
Chapter-1 The Living World - Biodiversity: Classification of living organisms, Taxonomy and Systematics, Taxonomic Categories (From species to kingdom), Biological classification, Binomial nomenclature.
Chapter-2: Biological Classification - Five Kingdom classification, Salient features and classification of Monera, Protista, Fungi into major groups; lichens, viruses, viroids and prions.
Chapter-3: Plant Kingdom - Classification of plants into major groups, salient and distinguishing features and a few examples of Algae, Bryophytes, Pteridophytes, Gymnosperms and a preliminary idea of Angiosperms.
Chapter 4: Animal Kingdom - Basis of classification. Salient features and classification of animals, non-chordates up to phylum level and chordates up to class level.
Unit-II: Structural Organisation in Plants and Animals
Chapter 5: Morphology of Flowering Plants - Morphology of different parts of flowering plants- root, stem, leaf, inflorescence, flower, fruit and seed. Description of the family Solanaceae
Chapter 6: Anatomy of Flowering Plants - Types of tissues; Tissue Systems in dicots and monocots, Anatomy of Dicotyledonous and Monocotyledonous plants.
Chapter 7: Structural Organisation in Animals - Morphology, Anatomy and functions of different systems (Digestive, Circulatory, Respiratory, Nervous and Reproductive) of the frog.
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Download EBookUnit-III: Cell: Structure and Function
Chapter 8: 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 endomembrane system, endoplasmic reticulum, Golgi bodies, lysosomes, vacuoles, mitochondria, ribosomes, plastids, microbodies, cytoskeleton, cilia, flagella, centrosome and centrioles (ultrastructure and function): nucleus and its ultrastructures.
Chapter 9: Biomolecules - Chemical constituents of living cells: biomolecules, structure and functions of Proteins, Carbohydrates and Nucleic Acids. Enzymes-Types, Properties, enzyme action, classification and nomenclature of enzymes.
Chapter 10: Cell Cycle and Cell Division - Cell Cycle. Mitosis and Meiosis – their phases and their significance.
Unit IV: Plant Physiology
Chapter 11: Photosynthesis in Higher Plants - Early experiments relating to photosynthesis. 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.
Chapter-12 Respiration in Plants - Exchange of gases; Cellular respiration: Glycolysis, Fermentation (anaerobic), TCA Cycle and Electron transport system (aerobic), Energy relations – Number of ATP molecules generated, anabolic pathway, respiratory quotient.
Chapter 13: Plant Growth and Development - Phases of Plant Growth and Plant Growth Rate, conditions required for growth, differentiation, dedifferentiation and redifferentiation. Sequence of developmental process in a plant's cell: Plant, Growth regulators-Auxin, Gibberelins, Cytokinins. Ethylene, ABA.
Unit V: Human Physiology
Chapter-14: Breathing and Exchange of Gases - Respiratory organs in animals (recall only); 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- Asthma, Emphysema, Occupational respiratory disorders.
Chapter-15: 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- hypertension, coronary artery disease, angina pectoris, heart failure.
Chapter-16: 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, mechanism, atrial natriuretic factor, ADH and diabetes insipidus; role of other organs in excretion: excretory disorder-uremia, renal failure, renal calculi, nephritis, dialysis and artificial kidney, kidney transplant.
Chapter-17: Locomotion and Movement - Types of movement-ciliary, flagellar, muscular, skeletal muscle, contractile proteins and mechanism of muscle contraction; skeletal system and its functions; joints, disorders of muscular and skeletal systems- myasthenia gravis, tetany, muscular dystrophy, arthritis, osteoporosis, gout.
Chapter-18: Neural Control and Coordination - Neuron and Nerves; Nervous system in human-Central nervous system; Peripheral nervous system and Visceral nervous system; generation and conduction of nerve impulse.
Chapter-19: Chemical Coordination and Integration - Endocrine glands and hormones; human endocrine system- Hypothalamus, Pituitary, Pineal, Thyroid, Parathyroid, Adrenal, Pancreas, Gonads. Mechanism of hormone action (elementary idea), role of hormones as messengers and regulators, hypo and hyperactivity and related disorders, dwarfism, acromegaly, cretinism, goitre, exophthalmic goitre, diabetes, Addison’s disease.
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Detailed Syllabus of AHSEC Biology Syllabus 2025-26 (Final Year)
Students can check out the detailed contents of the AHSEC Board Class 12 syllabus 2024-25 for the Biology subject. We will update the new syllabus as per availability. Check out the unit names and chapter-wise syllabus in the sections below.
Unit-VI: Reproduction
Chapter 1: Sexual Reproduction in Flowering Plants: (i) Flower-An organ of sexual reproduction of Angiosperms; (ii) Pre-fertilisation: Structures and Events; (iii) Double Fertilisation; (iv) Post-fertilisation: Structures and Events; (v) Apomixis and Polyembryony.
Chapter 2: Human Reproduction: (i) The Male Reproductive System; (ii) The Female Reproductive System;(iii) Gametogenesis; (iv) Menstrual Cycle; (v) Fertilisation and Implantation; (vi) Pregnancy and Embryonic Development; (vii) Parturition and Lactation.
Chapter 3: Reproductive Health: (i) Reproductive Health-Problems and Strategies; (ii) Population Stabilisation and Birth Control; (iii) Medical Termination of Pregnancy; (iv) Sexually Transmitted Infections; (v) Infertility and Assisted Reproductive Technology
Unit-VII: Genetics and Evolution
Chapter 4: Principles of Inheritance and Variation: (i) Mendel’s Laws of Inheritance; (ii) Inheritance of One Gene; (iii) Inheritance of Two Genes; Chromosomal Theory of Inheritance; Linkage and recombination (iv) Sex Determination; (v) Mutation; (vi) Genetic Disorders.
Chapter 5: Molecular Basis of Inheritance: (i) The DNA; (ii) The Search for Genetic Material; (iii) RNAWorld; (iv) Replication; (v) Transcription; (vi) Genetic Code; (vii) Translation; (viii) Regu- lation of Gene Expression; (ix) Human Genome Project; (x) DNA Fingerprinting.
Chapter 6: Evolution: (i) Origin of Life; (ii) Evolution of Life Formes- ATheory; (iii) Evidence for Evolution; (iv) Adaptive Radiation;(v) Biological Evolution; (vi) Mechanism ofEvolution; (vii) Hardy- Weinberg Principle; (viii) Abrief account of Evolution; (ix) Originand Evolution of Man.
Unit VIII: Biology in Human Welfare
Chapter 7: Human Health and Diseases: (i) Common Diseases in Humans; Typhoid, Pneumonia, Common Cold, Malaria, Amoebiasis, Ascariasis, Elephantiasis, Ringworm; (ii) Immunity; (iii) AIDS; (iv) Cancer; (v) Drugs and Alcohol Abuse.
Chapter 8: Microbes in Human Welfare: (i) Microbes in Household Products; (ii) Microbes in Industrial Products; (iii) Microbes in Sewage Treatment; (iv) Microbes in Production of Biogas; (v) Microbes as Biocontrol Agents;(vi) Microbes as Biofertilisers.
Unit-IX: Biotechnology
Chapter 9: Biotechnology; Principles and Processes: (i) Principles of Biotechnology; (ii) Tools of recombinant DNA Technology; (iii) Processes of Recombinant DNA Technology.
Chapter 10: Biotechnology and its Application: (i) Biotechnological Applications in Agriculture; (ii) Biotechnological Applications in Medicine; (iii) Transgenic Animals;(iv) Ethical Issues (iv) Ethical issues.
Unit-X: Ecology
Chapter 11: Organisms and Populations: (i) Organism and its Environment; (ii) Populations- Population Attributes; Population Growth and Population Interactions.
Chapter 12: Ecosystems: (i) Ecosystem - Structure and Function; (ii) Productivity; (iii) Decomposition; (iv) Energy Flow; (v) Ecological Pyramids;
Chapter 13: Biodiversity and Conservation: (i) Biodiversity; (ii) Biodiversity Conservation; (iii) National Parks and Sanctuaries of Assam with special reference to the conservation of endangered species.
Chapter 14: Bioresources of Assam: (i) Medicinal (Sarpagandha, Neem, Tulsi, Cinchona and Atropa) Timber Yielding (Teak, Sal, Sissoo, Gomari, Hollong) Plants; (ii) Sericogenic Resources (Muga and Eri).
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On Question asked by student community
Have a question related to Assam AHSEC ?
The AHSEC 12th Exam is the Higher Secondary (HS) Final Examination conducted by the Assam Higher Secondary Education Council for students in Class 12 across various streams like Science, Commerce, Arts, and Vocational in the state of Assam.
If you missed the Assam AHSEC exam due to genuine medical emergency then you must contact your respective school authorities and talk to the Assam board immediately. Other than that, you will have to submit a medical certificate and an application for proof. After that, the board will decide and might allow you to take the special exam.
Yes, the Assam HS (Higher Secondary) exam will be held in 2025 from February 13 to March 17. Assam HS exams will be conducted in two shifts: morning (9:00 AM to 12:00 PM) and afternoon (1:30 PM to 4:30 PM).
No, students are not allowed to sit for the Assam HS exam without the admit card. The Assam board releases the Assam AHSEC admit card on the official website, ahsec.assam.gov.in, you can login and download it or you can also contact your respective school authorities directly for a replacement.
Hello,
The eligibility for engineering candidates are 1) they must have scored at least 60% in class 12. 2) Candidates must have completed their 12th in science stream with maths, physics and chemistry as a part of their subjects.
You do not need to reappear for all the exams. You can appear only for the subjects that are main in the eligibility for engineering. The main subjects are Physics, Chemistry and Maths. You can appear for these examinations only and also if you are sure that these subjects plus the other subjects included will give you a percentage of more than 60% then you don't have to give any other exam.
I hope this helps,
All the best
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