The NEET Biology syllabus is based entirely on the NCERT Class 11 and 12 textbooks and encompasses topics from botany and zoology. Biology in NEET accounts for approximately 50% of the total marks and plays a decisive role in determining a student’s rank. For any medical aspirant, biology isn’t just a subject; it’s the backbone of your NEET preparation.
Most of the questions are from NCERT concepts, lines, and diagrams, and 80 to 90% are directly and indirectly from NCERT. The bottom line for NEET aspirants is to stick to NCERT as the primary source.
In this guide, we break down the complete NEET Biology syllabus to help you prepare with precision.
NEET Biology Syllabus 2026
In the latest NEET Biology exam pattern (as per NTA guidelines for recent years, including 2025 trends continuing into 2026), the paper consists of 90 questions. These are all multiple-choice questions (MCQs) based on the NCERT syllabus from Classes 11 and 12.
- Out of the total 180 questions in the NEET UG exam, Biology accounts for 50% of the paper.
- This makes it the most important section, where scoring near-perfect marks (340–360 out of 360) is key to achieving a high rank.
Class 11 Biology Syllabus (Units 1-5)
Unit 1: Diversity of Living Organisms
This unit covers classification and biodiversity.
Key topics:
- What is living? ; Biodiversity; Need for classification; Taxonomy & Systematics; Concept of species and taxonomical hierarchy; Binomial nomenclature
- Five Kingdom Classification: Salient Features and classification of Monera; Protista and Fungi into major groups; Lichens; Viruses and Viroids.
- Salient features and classification of plants into major groups-Algae, Bryophytes, Pteridophytes, Gymnosperms (three to five salient and distinguishing features and at least two examples of each category);
- Salient features and classification of animals-nonchordate up to phyla level and chordate up to classes level (three to five salient features and at least two examples)
Unit 2: Structural Organization in Plants and Animals
Focus on morphology and anatomy.
- Morphology and modifications; Tissues; Anatomy and functions of different parts of flowering plants: Root, stem, leaf, inflorescence-cymose and racemose, flower, fruit, and seed (To be dealt along with the relevant practical of the Practical Syllabus) Family (Malvaceae, Cruciferae, Leguminosae, Compositae, Graminae).
Animal tissues: Morphology, anatomy, and functions of different systems (digestive, circulatory, respiratory, nervous, and reproductive) of an insect (frog). (Brief account only).
Unit 3: Cell Structure and Function
Core cell biology.
- Cell theory and cell as the basic unit of life; Structure of prokaryotic and eukaryotic cell; Plant cell and animal cell; Cell envelope, cell membrane, cell wall; Cell organelles-structure and function; Endomembrane system-endoplasmic reticulum, Golgi bodies, lysosomes, vacuoles; mitochondria, ribosomes, plastids, micro bodies; Cytoskeleton, cilia, flagella, centrioles (ultrastructure and function); Nucleus-nuclear membrane, chromatin, nucleolus.
- Chemical constituents of living cells: Biomolecules-structure and function of proteins, carbohydrates, lipids, nucleic acids; Enzymes-types, properties, enzyme action, classification, and nomenclature of enzymes.
B Cell division: Cell cycle, mitosis, meiosis, and their significance
Unit 4: Plant Physiology
Processes in plants (updated with deletions).
- Photosynthesis: Photosynthesis as a means of Autotrophic nutrition; Site of photosynthesis takes place; 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.
- Respiration: Exchange gases; Cellular respiration-glycolysis, fermentation (anaerobic), TCA cycle, and electron transport system (aerobic); Energy relations- Number of ATP molecules generated; Amphibolic pathways; Respiratory quotient.
- Plant growth and development: Seed germination; Phases of Plant growth and plant growth rate; Conditions of growth; Differentiation, dedifferentiation and redifferentiation; Sequence of developmental process in a plant cell; Growth regulators auxin, gibberellin, cytokinin, ethylene, ABA
Unit 5: Human Physiology
Body systems.
- Breathing and Respiration: 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 volumes; Disorders related to respiration-Asthma, Emphysema, Occupational respiratory disorders.
- 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.
- 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; Uraemia, Renal failure, Renal calculi, Nephritis; Dialysis and artificial kidney.
- Locomotion and Movement: Types of movement- ciliary, flagellar, muscular; Skeletal muscle- contractile proteins and muscle contraction; Skeletal system and its functions: (To be dealt with along with the relevant practical of Practical syllabus); Joints; Disorders of the muscular and skeletal system-Myasthenia gravis, Tetany, Muscular dystrophy, Arthritis, Osteoporosis, Gout.
- 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.
- Chemical coordination and regulation: 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 (Common disorders e.g. Dwarfism, Acromegaly, Cretinism, goiter, exophthalmic goiter, diabetes, Addison’s disease). (Imp: Diseases and disorders mentioned above to be dealt with briefly.)
(Note: Digestion and Absorption chapter has reduced in-depth coverage for 2026.)
Class 12 Biology Syllabus (Units 6-10
Unit 6: Reproduction
Human and plant reproduction (Reproduction in Organisms deleted).
- 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 and fruit formation.
- Human Reproduction: Male and female reproductive systems; Microscopic anatomy of testis and ovary; Gametogenesis-spermatogenesis & oogenesis; Menstrual cycle; Fertilisation, embryo development up to blastocyst formation, implantation; Pregnancy and placenta formation (Elementary idea); Parturition (Elementary idea); Lactation (Elementary idea).
Reproductive health: Need for reproductive health and prevention of sexually transmitted diseases (STD); Birth control-Need and Methods, Contraception and Medical Termination of Pregnancy (MTP); amniocentesis; Infertility and assisted reproductive technologies – IVF, ZIFT, GIFT (Elementary idea for general awareness).
Unit 7: Genetics and Evolution
Core high-weightage unit.
- Heredity and variation: Mendelian Inheritance; Deviations from Mendelism-Incomplete dominance, Codominance, 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, honey bee; Linkage and crossing over; Sex linked inheritance-Haemophilia, Colour blindness; Mendelian disorders in humans-Thalassemia; Chromosomal disorders in humans; Down’s syndrome, Turner’s and Klinefelter’s syndromes.
- Molecular basis of Inheritance: Search for genetic material and 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 and human genome project; DNA fingerprinting, protein biosynthesis.
- Evolution: Origin of life; Biological evolution and evidence for biological evolution from Paleontology, comparative anatomy, embryology, and molecular evidence; 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.
Unit 9: Biotechnology and Its Applications
Modern biotech.
- Principles and process of Biotechnology: Genetic engineering (Recombinant DNA technology).
- Application of Biotechnology in health and agriculture: Human insulin and vaccine production, gene therapy; Genetically modified organisms-Bt crops; Transgenic Animals; Biosafety issues-Biopiracy and patents.
Unit 10: Ecology and Environment
Environmental biology (Succession and Environmental Issues rationalized).
- Organisms and Population: Population interactions-mutualism, competition, predation, parasitism; Population attributes-growth, birth rate and death rate, age distribution.
- Ecosystem: Patterns, components, productivity and decomposition; Energy flow; Pyramids of number, biomass, energy.
- Biodiversity and its conservation: Concept of Biodiversity; Patterns of Biodiversity; Importance of Biodiversity; Loss of Biodiversity; Biodiversity conservation; Hotspots, endangered organisms, extinction; Red Data Book; Biosphere reserves, National parks and sanctuaries, Sacred Groves.
Biology Decides Your NEET Rank — Are You Preparing It Right?
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Click HereBotany vs Zoology in NEET Biology
Biology is split into Botany (plant-related) and Zoology (animal/human-related). Botany often has more diagram-based questions; Zoology focuses on processes and disorders
- Botany Chapters (Class 11 & 12): Diversity in Living World, Structural Organisation in Plants, Cell Structure & Function, Plant Physiology, Reproduction in Flowering Plants, Genetics (plant aspects), Biotechnology (plant apps), Ecology (plant interactions
- Zoology Chapters: Animal Kingdom, Structural Organisation in Animals, Human Physiology, Reproduction (human), Genetics, Evolution, Biology and Human Welfare, Biotechnology (health), Ecology (population interaction).
Chapter-wise Weightage for NEET Biology 2026
Based on past trends, here’s an approximate weightage table. Prioritize high-weightage chapters for efficient prep.
Important Topics for NEET Biology 2026
Botany: Cell cycle phases (mitosis/meiosis diagrams), Photosynthesis (C3/C4 cycles, factors), Plant hormones (actions/effects), Genetic code & translation, Ecosystem energy flow.
Zoology: Human reproductive system (hormones, disorders), Mendelian genetics (disorders like Thalassemia), Evolution theories (evidence), Endocrine system (glands/disorders), Neural control (action potential), Biotechnology I & II.
Avoid deleted topics like Mineral Nutrition (entire chapter), Transport in Plants details beyond basics, and Environmental Issues.
Recommended Books and Preparation Tips
Books:
- Primary: NCERT Biology Class 11 & 12 (must-read multiple times).
- Xylem Specials: NCERT chapter-wise MCQs & diagrams, DPP Series (daily practice for Botany/Zoology), Mind Maps (quick revision), NEET 37 Years Solved Papers, NCERT Punch.
- Others: Trueman’s Biology, MTG Fingertips for MCQs.
Tips:
- Stick to NCERT; 90% questions are direct or derived. Read line-by-line, highlight key terms.
- Create short notes to summarize (e.g., Krebs cycle flowchart) and revise weekly.
- Practice 100+ MCQs daily via the Xylem App and Xylem NCERT Cracker.
- Focus on high-weightage topics and dedicate 40% time to Physiology & Genetics.
- Mock tests are the key players! Take full-syllabus tests twice weekly; aim for 300+ in Biology.
- Make sure to practice diagrams for labeling (e.g., heart, flower) as they fetch easy marks.
- Make sure to sleep 7 hours, exercise, and eat well to avoid burnout.
- Join Xylem’s upcoming crash revision batches for better results.
How do you prepare for NEET Biology based on the syllabus?
To prepare for NEET Biology 2026 effectively, you must align your study plan with the NCERT syllabus, prioritizing high-weightage chapters like Genetics, Biotechnology, and Human Physiology. A successful strategy involves a structured study order, active revision techniques, and consistent MCQ practice to master the 360 marks available in this section
NEET Biology Preparation Strategy Based on Syllabus
1. Optimized Study Order
The most effective NEET biology preparation tip is to categorize the syllabus by weightage. Start with high-yield chapters to build a scoring foundation:
- High Priority: Genetics and Evolution, Ecology, Human Physiology, and Plant Physiology.
- Foundation Building: Cell Structure and Functions, Diversity in Living Organisms.
- Application-Based: Biotechnology and Human Welfare.
2. Revision Techniques
Studies and surveys suggest that active recall and spaced repetition are the most effective ways to study biology for NEET.
- Flashcards: Use these for scientific names, years, and specific terminology.
- Conceptual Mapping: Create flowcharts for complex cycles like the Krebs Cycle or Calvin Cycle to visualize the process flow.
- Xylem Mind Maps: These are visual study tools that use mind mapping techniques to simplify the complex biology for students. Mind Maps transforms dense textbook info into clear, hierarchical diagrams for better understanding, revision, and exam prep.
3. MCQ Practice
Success in NEET depends on your ability to solve 90 questions in roughly 45 minutes.
- NCERT Cracker: It’s a tool for quick revision, concept building, and practice, often featuring questions from previous years (PYQs) and NCERT-based MCQs.
- NCERT-Extracted MCQs: Practice questions where every option is derived from NCERT lines.
- Time-Bound Mock Tests: Solve at least 100 MCQs daily under a strict timer to improve speed and accuracy.
4. Diagram & Table Revision
Over 20% of Biology questions are either direct diagrams or based on tabular data.
- Visual Memorization: Re-draw NCERT diagrams until you can label them without looking.
- Table Synthesis: Focus on tables comparing Phyla in Animalia or different Plant Hormones, as these are frequent sources of “Match the Following” questions.
Expert Insight for NEET 2026: When studying, don’t just read a chapter; explain it out loud as if teaching. This “Feynman Technique” is recognized as a sign of deep topical authority.
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FAQ
Yes, 85-90% questions are NCERT-based. Supplement with Xylem materials for practice.
A total of 90 questions will be there for the NEET exam (45 Botany, 45 Zoology)
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The NEET 2026 Biology syllabus was released on January 8, 2026, by NTA with unchanged core and minor deletions.
Absolutely! Xylem’s app offers expert-led NEET prep through live classes, personalized study plans, and real-time doubt clearing with advanced performance analytics