CBSE Class 11 Biology Deleted Syllabus 2025-26: Download PDF

The CBSE Board has reduced the syllabus of the class 11th exam by 30%. The CBSE class 11 biology deleted syllabus 2025-26 contains the chapters and topics that are no longer part of the curriculum.

Three chapters, such as Transport in Plants, Mineral Nutrition, and Digestion and Absorption, have been completely removed from the class 11 Biology syllabus, while a few sections from other chapters have also been deleted.

The CBSE class 11 exam 2024 will cover all the chapters in the syllabus. As per the CBSE class 11 exam pattern 2025-26, the mathematics exam consists of 80 marks for the theory part, and the remaining 20 marks are assigned for practicals.

This article covers information about the CBSE class 11 biology deleted syllabus. Students can follow the instructions below to perform better in the final examination.

CBSE Class 11 Biology Syllabus 2025-26 Download PDF

The Central Board of Secondary Education (CBSE) has released the syllabus for all the subjects. Several sections/topics have been deleted from the CBSE class 11 biology syllabus. Candidates can find the PDF for the updated syllabus in the link tabulated below.

Class 11 CBSE Biology Deleted Syllabus 2025-26

As CBSE has published the revised class 11th Biology syllabus, some NCERT Biology chapters and topics have been eliminated for the current academic year. Therefore, students need to know the CBSE class 11 Biology deleted syllabus 2025-26 to be on the right track for exam preparation.

Listed below are the topics deleted from the CBSE class 11 biology syllabus 2025-26.

Unit I: Diversity of Living Organisms

The revisions/deletions in Unit I, 'Diversity of Living Organisms', have been listed below -

Chapter 1: The Living World

• Biodiversity
• Need for classification
• Three domains of life
• taxonomy and systematics
• Concept species and taxonomical hierarchy
• Binomial nomenclature

Chapter 2: Biological Classification

• Five-kingdom classification
• Salient features and classification of Monera, Protista, and Fungi into major groups
• Lichens, Viruses, and Viroids

Chapter 3: Plant Kingdom

• Classification of plants into major groups
• Salient and distinguishing features and a few examples of Algae, Bryophyta, Pteridophyta, and Gymnospermae (Topics excluded – Angiosperms, Plant Life Cycle, and Alternation of Generations)

Chapter 4: Animal Kingdom

• Salient features and classification of animals, non-chordates up to phylum level, and chordates up to class level (salient features and a few examples of each category).
• (No live animals or specimens should be displayed.)

Unit-II: Structural Organization in Plants and Animals

The revisions/deletions in Unit-II, 'Structural Organization in Plants and Animals', have been listed below -

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

• Anatomy and functions of tissue systems in dicots and monocots.

Chapter 7: Structural Organisation in Animals

• Morphology, Anatomy, and functions of different systems (digestive, circulatory, respiratory, nervous, and reproductive) of frogs.

Unit-III Cell: Structure and Function

The revisions/deletions in Unit III, 'Structure and Function', have been listed below. This updated syllabus is an outcome of the CBSE class 11 biology deleted syllabus -

Chapter 8: Cell - The Unit of Life

• Cell theory and the cell as the basic unit of life, the structure of prokaryotic and eukaryotic cells
• Plant cells and animal cells
• 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 (ultrastructure and function)
• Nucleus

Chapter-9: Biomolecules

• Chemical constituents of living cells: biomolecules, structure, and function of proteins
• Carbohydrates, lipids, and nucleic acids
• Enzyme types, properties, and enzyme action. (Topics excluded: Nature of Bond Linking Monomers in a Polymer, Dynamic State of Body Constituents, Concept of Metabolism, Metabolic Basis of Living, The Living State)

Chapter 10: Cell Cycle and Cell Division

• Cell cycle, mitosis, meiosis, and their significance

Unit IV Plant Physiology

The revisions/deletions in Unit I, 'Plant Physiology', have been listed below -

Chapter 13: Photosynthesis 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.

Chapter 14: 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
• Amphibolic pathways
• Respiratory quotient.

Chapter 15: Plant Growth and Development

• Seed germination
• Phases of plant growth and plant growth rate
• Conditions of growth
• Differentiation, differentiation, and redifferentiation
• The sequence of developmental processes in a plant cell
• Plant growth regulators - auxin, gibberellin, cytokinin, ethylene, ABA

Unit-V Human Physiology

The revisions/deletions in Unit I, 'Human Physiology', have been listed below. It has been curated as per the CBSE class 11 biology deleted syllabus -

Chapter 17: 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 18: Body Fluids and Circulation

• Composition of blood, blood groups, coagulation of blood, composition of lymph, and its function
• Human circulatory system - Structure of the human heart and blood vessels
• Cardiac cycle, Cardiac output
• ECG
• Double circulation
• Regulation of cardiac activity
• Disorders of the circulatory system - hypertension, coronary artery disease, angina pectoris, heart failure.

Chapter 19: 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 - uremia, renal failure, renal calculi,
• Nephritis, dialysis and artificial kidney, and kidney transplant

Chapter 20: Locomotion and Movement

• Types of movement - ciliary, flagellar, muscular
• Skeletal muscle, contractile proteins, and muscle contraction
• Skeletal system and its functions
• Joints
• Disorders of the muscular and skeletal systems - myasthenia gravis, tetany, muscular dystrophy, arthritis, osteoporosis, gout

Chapter 21: Neural Control and Coordination

• Neurons and nerves
• Nervous system in humans - central nervous system
• peripheral nervous system and visceral nervous system
• Generation and conduction of nerve impulses

Chapter 22: 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

Note: Diseases related to all the human physiological systems are to be taught briefly.

Deleted CBSE Class 11 Biology Syllabus 2025 from NCERT Books

NCERT Books have been updated as per the revised CBSE Class 11 syllabus. The table below contains the deleted page number of each chapter in the NCERT 11th Biology book as per the CBSE class 11 Biology deleted syllabus 2025-26.

CBSE Class 11 Preparation Tips for Biology

Students can ace the Biology exam for class 11th, provided they adopt the proper methods and techniques. Students can practice the CBSE sample papers for class 11th Biology to get familiar with the exam pattern and question format.

Here are a few tips and tricks that will help students achieve the best possible results.

• Awareness of the syllabus: It is undoubtedly the most important step to begin the preparation for any examination. Along with the syllabus, candidates should be aware of the CBSE class 11 Biology deleted syllabus 2025-26 so that they are very clear about the topics involved.
• Clarity on the paper pattern: Once students gain knowledge of the syllabus, it is equally essential for them to know the marking pattern, type of questions, duration, etc., of the exam.
• Develop a study timetable: Students can efficiently cover the entire syllabus of class 11 Biology only if they have a proper timetable in place. Candidates should create a routine according to their strengths and weaknesses and follow it strictly.
• Study the reference material well: As Biology is more of a theoretical subject, students should go through the terms and concepts multiple times to retain all the information effectively.
• Practice Diagrams: Diagrams are a crucial part of the Biology paper. Along with studying theory, students must make sure they are practicing relevant diagrams. This will aid them in securing good marks on the exam.
• Make short notes: Since a lot of information must be consumed in Biology, making notes of the essential points will work wonders for the aspirants. The CBSE class 11th Biology notes should be reviewed well by the students before the examination.
• Solve mock tests & past years’ papers: There are many benefits of practicing and analyzing the CBSE class 11 biology sample papers and mock tests. A fair idea of the nature of questions, the common questions, and the high-weightage topics can be gained by solving them.
• Revision is the key: Once the syllabus has been covered, it is time to revise! Candidates should revise every topic in detail so that all that has been studied remains fresh in their minds. The CBSE 11th Biology deleted syllabus 2025-26 includes a good number of topics. Therefore, students are advised to review the deleted portion minutely and only concentrate on the topics that are relevant to the syllabus.

CBSE Class 11 Biology Course Structure 2025-26

The CBSE has released the course structure for CBSE class 11 biology, which has been updated as per the CBSE class 11 biology deleted syllabus 2025-26. Students can also review the CBSE Class 11th Blueprint 2025-26 to gain in-depth insight into to chapter-wise marking scheme.

Tabulated below is the detailed course structure as per the CBSE biology class 11 deleted syllabus 2025-26 has been provided in the tabular below.

CBSE Class 11 Question Paper Design 2026

In the CBSE class 11 Biology exam, students will be asked MCQs, short answers, and long answer questions from the updated syllabus. The structure has been shared for different programs.