CBSE Class 11 Biology Syllabus 2026-27: 19 Chapters, Marks & PDF

CBSE Class 11 Biology Syllabus Exam Syllabus & Pattern 2026

The Central Board of Secondary Education (CBSE) has officially published the CBSE Class 11 Biology Syllabus for the academic session 2026-27. This comprehensive curriculum is designed to provide students with a strong foundation in biological sciences, covering everything from the diversity of living organisms to complex human physiology. The syllabus for Biology, bearing Subject Code 044, is structured into five distinct units comprising a total of 19 theory chapters.

For the 2026-27 session, the assessment structure remains balanced, with the theory examination accounting for 70 marks and practical work accounting for 30 marks, culminating in a total of 100 marks. This article provides a detailed breakdown of the unit-wise weightage, chapter list, practical marking scheme, and preparation strategies to help students excel in their Class 11 Biology examinations.

About Central Board of Secondary Education (CBSE) Written Exam

The Central Board of Secondary Education (CBSE) is the national level board of education in India for public and private schools, controlled and managed by the Union Government of India. The Board conducts the All India Senior School Certificate Examination (AISSCE) for Class 12 and the All India Secondary School Examination (AISSE) for Class 10. For Class 11, the examination is typically conducted internally by the respective schools affiliated with CBSE, following the curriculum and guidelines set forth by the Board.

The Class 11 Biology curriculum is meticulously designed to bridge the gap between foundational science learned in earlier classes and the more advanced concepts introduced in Class 12. It emphasizes conceptual understanding, application of knowledge, and the development of practical skills. The syllabus aims to nurture curiosity about the natural world and equip students with the scientific temper required for higher education in medicine, engineering, and pure sciences.

CBSE Class 11 Biology Syllabus Exam Scheme & Marking

The evaluation for Class 11 Biology is divided into two primary components: Theory and Practical. The theory paper is worth 70 marks, while the practical examination carries 30 marks. The theory paper is designed to test a student's grasp of concepts across five units, with varying weightage assigned to each unit based on the depth and breadth of the content.

The table below outlines the unit-wise marks distribution for the CBSE Class 11 Biology theory examination 2026-27:

The question paper pattern is designed to assess different competencies. Approximately 20% of the questions are Multiple Choice Questions (MCQs) or Assertion-Reason type, 20% are case-based or competency-based questions, and the remaining 60% are short and long answer questions. Students are generally required to include diagrams in their answers where specified.

Detailed Subject-Wise Syllabus

The CBSE Class 11 Biology Syllabus is divided into five units, each containing specific chapters that delve into different aspects of biology. Below is the detailed chapter-wise breakdown:

Unit I: Diversity of Living Organisms (15 Marks)

• Chapter 1: The Living World - Biodiversity, need for classification, taxonomy and systematics, concept of species, taxonomical aids.
• Chapter 2: Biological Classification - Five kingdom classification, Monera, Protista, Fungi, Plantae, Animalia, viruses, viroids, prions, and lichens.
• Chapter 3: Plant Kingdom - Algae, Bryophytes, Pteridophytes, Gymnosperms, Angiosperms, and plant life cycles.
• Chapter 4: Animal Kingdom - Basis of classification, classification of animals (Phyla Porifera to Chordata).

Unit II: Structural Organisation in Plants and Animals (10 Marks)

• Chapter 5: Morphology of Flowering Plants - Root, stem, leaf, inflorescence, flower, fruit, seed, and floral formula.
• Chapter 6: Anatomy of Flowering Plants - Tissues, tissue systems, anatomical differences in dicots and monocots.
• Chapter 7: Structural Organisation in Animals - Animal tissues, organs and organ systems (Earthworm, Cockroach, Frog).

Unit III: Cell: Structure and Function (15 Marks)

• Chapter 8: Cell: The Unit of Life - Cell theory, prokaryotic and eukaryotic cells, cell organelles.
• Chapter 9: Biomolecules - Chemical composition, proteins, carbohydrates, lipids, nucleic acids, enzymes.
• Chapter 10: Cell Cycle and Cell Division - Cell cycle, mitosis, meiosis, and their significance.

Unit IV: Plant Physiology (12 Marks)

• Chapter 11: Transport in Plants - Means of transport, plant-water relations, long distance transport, transpiration.
• Chapter 12: Mineral Nutrition - Essential minerals, macro and micronutrients, deficiency symptoms, nitrogen metabolism.
• Chapter 13: Photosynthesis in Higher Plants - Photosynthesis as a means of autotrophic nutrition, light reaction, Calvin cycle, C3 and C4 pathways.
• Chapter 14: Respiration in Plants - Glycolysis, fermentation, aerobic respiration, respiratory balance sheet.
• Chapter 15: Plant Growth and Development - Growth, differentiation, dedifferentiation, redifferentiation, plant growth regulators.

Unit V: Human Physiology (18 Marks)

• Chapter 16: Digestion and Absorption - Alimentary canal, digestive glands, digestion and absorption of food.
• Chapter 17: Breathing and Exchange of Gases - Respiratory organs, mechanism of breathing, exchange of gases, transport of gases.
• Chapter 18: Body Fluids and Circulation - Blood, lymph, circulatory pathways, cardiac cycle, ECG.
• Chapter 19: Excretory Products and their Elimination - Human excretory system, urine formation, regulation of kidney function.
• Chapter 20: Locomotion and Movement - Types of movement, muscle, skeletal system, joints, disorders.
• Chapter 21: Neural Control and Coordination - Neuron, nervous system, central nervous system, reflex action.
• Chapter 22: Chemical Coordination and Integration - Endocrine glands, hormones, mechanism of hormone action.

Note: While the source mentions 19 chapters, the detailed list often includes 22 chapters as per the latest NCERT rationalization. Students are advised to refer to the official CBSE PDF for the final list.

CBSE Class 11 Biology Syllabus Selection Stages

For Class 11 Biology, there is no competitive selection process like in recruitment exams. The evaluation is purely based on academic performance in the school examinations conducted by the respective CBSE-affiliated schools. The assessment structure includes:

• Theory Examination: A 3-hour written paper worth 70 marks covering the entire syllabus.
• Practical Examination: A 3-hour practical exam worth 30 marks, assessing experimental skills, slide preparation, spotting, and viva voce.

The final result is a combination of both theory and practical scores, leading to the overall grade for the subject.

Preparation Strategy & Tips

To excel in the CBSE Class 11 Biology examination, students should adopt a strategic approach that balances conceptual understanding with practical application. Here are some effective preparation tips:

• Master the NCERT: The NCERT textbook is the bible for CBSE Biology. Ensure you read every line and understand the diagrams thoroughly.
• Focus on High-Weightage Units: Human Physiology carries 18 marks, making it the most crucial unit. Allocate more time to understanding the complex processes of digestion, circulation, and neural control.
• Practice Diagrams: Biology is visual. Practice drawing neat, labeled diagrams for plants, animals, and human systems as they are often asked in exams.
• Regular Revision: With 19-22 chapters, regular revision is key. Create short notes or flashcards for quick recap.
• Practical Preparation: Do not neglect the practicals. Maintain a complete practical record and project file. Practice slide preparation and spotting as they carry significant marks.
• Solve Sample Papers: Familiarize yourself with the question pattern by solving CBSE sample papers and previous years' question papers.

Official Syllabus PDF Link

Students can download the official CBSE Class 11 Biology Syllabus 2026-27 PDF from the official CBSE Academic website. The direct link is provided below for easy access:

• Direct Link to CBSE Class 11 Biology Syllabus 2026-27
• CBSE Official Website

It is advisable to download the PDF and keep a printed copy for reference during your studies.

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