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CBSE Class 11 Biology Syllabus 2025-26
By Swati Singh
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Updated on 10 Jul 2025, 14:22 IST
The CBSE Class 11 Biology syllabus for the academic year 2025–26 has been published on the official CBSE website. Students can download the syllabus PDF using the link provided below.
There are no major changes in the syllabus compared to the 2025–26 version. This means students can start their preparation early in the academic session to score well in exams.
Reading the syllabus will help students understand each topic clearly and improve their learning outcomes. The syllabus includes:
- The complete course structure
- Marks distribution for all chapters and topics
- Estimated time needed to cover each unit
The Biology question paper will be based on this syllabus. So it is important for students to go through the Class 11 Biology syllabus carefully before planning their study schedule.
CBSE Class 11 Biology Syllabus 2025-26 Download PDF
Infinity learn provide you free CBSE class 11 biology syllabus PDF for students:
CBSE Class 11 Biology Syllabus 2025-26 Chapter Wise
| Unit No. | Unit Title | Chapters | Topics Covered | Marks |
| I | Diversity of Living Organisms | 1. The Living World 2. Biological Classification 3. Plant Kingdom 4. Animal Kingdom | Biodiversity; Need for classification; Three domains of life; Taxonomy and 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. Classification of plants into major groups: Algae, Bryophyta, Pteridophyta, Gymnospermae, and Angiosperms; Salient and distinguishing features with examples. Salient features and classification of animals: Non-chordates (up to phyla level) and Chordates (up to class level); Examples for each category. | 15 |
| II | Structural Organisation in Animals and Plants | 5. Morphology of Flowering Plants 6. Anatomy of Flowering Plants 7. Structural Organisation in Animals | Morphology of root, stem, leaf, inflorescence, flower, fruit, and seed; Description of family Solanaceae. Anatomy and functions of tissue systems in dicots and monocots. Animal tissues; Morphology, anatomy, and functions of different systems (digestive, circulatory, respiratory, nervous, and reproductive) of an insect (cockroach). | 10 |
| III | Cell: Structure and Function | 8. Cell: The Unit of Life 9. Biomolecules 10. Cell Cycle and Cell Division | 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; Cell organelles – structure and function; Endomembrane system, endoplasmic reticulum, Golgi bodies, lysosomes, vacuoles, mitochondria, ribosomes, plastids, microbodies; Cytoskeleton, cilia, flagella, centrioles; Nucleus. Structure and function of carbohydrates, proteins, lipids, nucleic acids; Enzymes – types, properties, and function. Phases of cell cycle; Mitosis and meiosis – significance and stages. | 15 |
| IV | Plant Physiology | 11. Transport in Plants 12. Mineral Nutrition 13. Photosynthesis in Higher Plants 14. Respiration in Plants 15. Plant Growth and Development | Means of transport; Plant-water relations; Long-distance transport of water; Transpiration; Uptake and translocation of mineral nutrients; Phloem transport. Essential minerals, macro- and micronutrients; Their role and deficiency symptoms; Mineral toxicity; Elementary idea of hydroponics as a method to study mineral nutrition; Nitrogen metabolism – nitrogen cycle and biological nitrogen fixation. 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. Exchange of gases; Cellular respiration – glycolysis, fermentation (anaerobic), TCA cycle, and electron transport system (aerobic); Energy relations – number of ATP molecules generated; Amphibolic pathways; Respiratory quotient. Growth regulators – auxin, gibberellin, cytokinin, ethylene, ABA; Seed dormancy; Vernalisation; Photoperiodism. | 12 |
| V | Human Physiology | 16. Digestion and Absorption 17. Breathing and Exchange of Gases 18. Body Fluids and Circulation 19. Excretory Products and Their Elimination 20. Locomotion and Movement 21. Neural Control and Coordination 22. Chemical Coordination and Integration | Digestive system; Digestion and absorption of carbohydrates, proteins, and fats; Disorders of digestive system. Respiratory organs in humans; Mechanism of breathing and its regulation in humans; Exchange of gases; Transport of gases and regulation of respiration; Respiratory volumes. Composition of blood; Blood groups; Coagulation of blood; Composition of lymph and its function; Human circulatory system; Cardiac cycle, cardiac output, ECG; Double circulation; Regulation of cardiac activity; Disorders of circulatory system – hypertension, coronary artery disease, angina pectoris, heart failure. Human excretory system; Structure and function of nephron; Urine formation; Osmoregulation; Regulation of kidney function; Renin-angiotensin, ADH, role of other hormones; Micturition; Role of other organs in excretion; Disorders – uremia, renal failure, renal calculi, nephritis; Dialysis and artificial kidney. 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 – myasthenia gravis, tetany, muscular dystrophy, arthritis, osteoporosis, gout. 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; Sense organs. 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 – dwarfism, acromegaly, cretinism, goiter, exophthalmic goiter, diabetes, Addison's disease). | 18 |
CBSE Class 11 Biology Syllabus 2025-26 Marking Scheme
1. Theory Paper – 70 Marks
Theory is divided into 5 units, with the following chapter and mark distribution:
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| Unit No. | Unit Title | Chapters Included | Marks |
| I | Diversity of Living Organisms | Chapters 1 to 4 | 15 |
| II | Structural Organisation in Animals and Plants | Chapters 5 to 7 | 10 |
| III | Cell Structure and Function | Chapters 8 to 10 | 15 |
| IV | Plant Physiology | Chapters 11 to 15 | 12 |
| V | Human Physiology | Chapters 16 to 22 | 18 |
| Total | 70 | ||
2. Practical Exam – 30 Marks
Practical work includes experiments, spotting, and project-based assessments:
| Component | Marks |
| One Major Experiment (e.g. slide preparation) | 5 |
| One Minor Experiment (e.g. spotting or analysis) | 4 |
| Slide Preparation (Temporary Mounting) | 5 |
| Spotting (Identification and Drawings) | 7 |
| Practical Record + Viva Voce | 4 |
| Project Work | 5 |
| Total | 30 |
Benefits of Downloading Class 11 Biology Syllabus 2025–26
Downloading the CBSE Class 11 Biology syllabus gives students and teachers a strong academic advantage. Here’s why it’s useful:
1. Clear Understanding of the Course Structure: The syllabus explains what topics will be taught, how chapters are grouped, and the exact scope of learning for the year.
2. Targeted Exam Preparation: It provides unit-wise marking, helping students focus on important topics and avoid out-of-syllabus learning.
3. Better Practical Planning: The syllabus outlines the practical exam structure, experiments, project work, and viva questions to prepare in advance.
4. Helps in Study Planning: Students can create effective study schedules and track their progress throughout the academic session.
5. Useful for Teachers, Parents, and Tutors: The syllabus helps in monitoring student performance, aligning coaching content, and providing accurate academic support.
6. Updated as per NEP and CBSE Guidelines: The 2025–26 syllabus reflects competency-based questions, application skills, and NEP-based updates.
7. Reliable and Official: The syllabus is sourced from the CBSE official site, ensuring accuracy and alignment with the actual board paper.
FAQs on CBSE Class 11 Biology Syllabus
How many marks is CBSE Class 11 Biology exam out of?
The Class 11 Biology exam is evaluated out of 100 marks, with 70 marks for theory and 30 marks for practicals.
How many units are there in the Class 11 Biology syllabus?
The syllabus is divided into 5 main units, covering 22 chapters:
Diversity of Living Organisms
Structural Organisation in Animals and Plants
Cell Structure and Function
Plant Physiology
Human Physiology
Is there any change in the Biology syllabus for 2025–26?
Yes. The 2025–26 syllabus is updated to align with NEP 2020 guidelines. It includes competency-based assessments, a revised structure, and focus on application-based questions.
What is the marking scheme for Class 11 Biology practicals?
The 30 marks for practicals are distributed as follows:
Major Experiment – 5 marks
Minor Experiment – 4 marks
Slide Preparation – 5 marks
Spotting – 7 marks
Record + Viva – 4 marks
- Project Work – 5 marks
What topics are included in the Human Physiology unit?
The Human Physiology unit includes:
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretion
Locomotion and Movement
- Nervous and Endocrine Coordination
Why is it important to download the official syllabus?
Downloading the official syllabus helps:
Understand the exact chapters and topics covered
Know the marks weightage for each unit
Prepare efficiently for both theory and practical exams
- Stay aligned with CBSE’s updated exam pattern
Is Class 11 Biology helpful for NEET and other exams?
Absolutely. Class 11 Biology forms the foundation for NEET, AIIMS, and other medical entrance exams. Many NEET questions are directly based on Class 11 chapters like Cell Biology, Plant Physiology, and Human Physiology.