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Free, original, step-by-step NCERT Solutions for Class 11 Biology, matching the current 2026-27 CBSE syllabus.
Each chapter below is solved question by question, in the order it appears in the textbook, so you can follow along page by page instead of jumping between sites. Click a chapter's Solutions link for the full worked answers, Extra Questions for additional practice beyond the textbook, and Revision Notes for a quick summary before a test.
Chapter 1: The Living World – Free PDF Download
Chapter 1 of Class 11 Biology is The Living World. It introduces what characterizes living organisms, biodiversity, taxonomy, and the nomenclature and classification systems used to organize life. These Class 11 Biology Chapter 1 solutions are also useful as quick revision notes before exams. Key defining features i...
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Chapter 2: Biological Classification – Free PDF Download
Chapter 2 of Class 11 Biology is Biological Classification. It explains the five kingdom classification system devised by R.H. Whittaker and the distinguishing features of each kingdom. These Class 11 Biology Chapter 2 solutions are also useful as quick revision notes before exams. Proposed by R.H. Whittaker (1969),...
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Chapter 3: Plant Kingdom – Free PDF Download
Chapter 3 of Class 11 Biology is Plant Kingdom. It covers the classification of plants within Kingdom Plantae, from algae to angiosperms, based on plant body organization, reproduction, and presence/absence of vascular tissue and seeds. These Class 11 Biology Chapter 3 solutions are also useful as quick revision not...
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Chapter 4: Animal Kingdom – Free PDF Download
Chapter 4 of Class 11 Biology is Animal Kingdom. It classifies the animal kingdom into phyla based on levels of organization, symmetry, body cavity (coelom), and other fundamental features. These Class 11 Biology Chapter 4 solutions are also useful as quick revision notes before exams. Animals are classified using: ...
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Chapter 5: Morphology of Flowering Plants – Free PDF Download
Chapter 5 of Class 11 Biology is Morphology of Flowering Plants. It covers the external structure and modifications of the root, stem, leaf, inflorescence, flower, fruit, and seed. These Class 11 Biology Chapter 5 solutions are also useful as quick revision notes before exams. Usually underground, develops from the ...
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Chapter 6: Anatomy of Flowering Plants – Free PDF Download
Chapter 6 of Class 11 Biology is Anatomy of Flowering Plants. It covers the internal structure of plant organs, tissue systems, and the difference between monocot and dicot anatomy. These Class 11 Biology Chapter 6 solutions are also useful as quick revision notes before exams. Meristematic tissue (actively dividing...
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Chapter 7: Structural Organisation in Animals – Free PDF Download
Chapter 7 of Class 11 Biology is Structural Organisation in Animals. It covers animal tissues and uses the earthworm as a representative example of organ-system level organization. These Class 11 Biology Chapter 7 solutions are also useful as quick revision notes before exams. Four basic types: epithelial tissue (co...
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Chapter 8: Cell - The Unit of Life – Free PDF Download
Chapter 8 of Class 11 Biology is Cell: The Unit of Life. It establishes cell theory and covers the structure and function of prokaryotic and eukaryotic cells and their organelles. These Class 11 Biology Chapter 8 solutions are also useful as quick revision notes before exams. Proposed by Schleiden and Schwann (all o...
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Chapter 9: Biomolecules – Free PDF Download
Chapter 9 of Class 11 Biology is Biomolecules. It covers the major chemical constituents of living cells: carbohydrates, proteins, lipids, nucleic acids, and enzymes. These Class 11 Biology Chapter 9 solutions are also useful as quick revision notes before exams. Composed of C, H, O (general formula (CH₂O)n). Classi...
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Chapter 10: Cell Cycle and Cell Division – Free PDF Download
Chapter 10 of Class 11 Biology is Cell Cycle and Cell Division. It covers the phases of the cell cycle, mitosis, and meiosis, and their significance in growth, repair, and reproduction. These Class 11 Biology Chapter 10 solutions are also useful as quick revision notes before exams. The sequence of events by which a...
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Chapter 11: Photosynthesis in Higher Plants – Free PDF Download
Chapter 11 of Class 11 Biology is Photosynthesis in Higher Plants. It covers the light and dark reactions of photosynthesis, photosynthetic pigments, and factors affecting the rate of photosynthesis. These Class 11 Biology Chapter 11 solutions are also useful as quick revision notes before exams. The process by whic...
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Chapter 12: Respiration in Plants – Free PDF Download
Chapter 12 of Class 11 Biology is Respiration in Plants. It covers cellular respiration -- glycolysis, fermentation, the Krebs cycle, and the electron transport chain -- and the energy yield from glucose breakdown. These Class 11 Biology Chapter 12 solutions are also useful as quick revision notes before exams. Occu...
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Chapter 13: Plant Growth and Development – Free PDF Download
Chapter 13 of Class 11 Biology is Plant Growth and Development. It covers the phases and characteristics of plant growth, and the roles of the five major plant growth hormones. These Class 11 Biology Chapter 13 solutions are also useful as quick revision notes before exams. Plant growth is indeterminate (continues t...
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Chapter 14: Breathing and Exchange of Gases – Free PDF Download
Chapter 14 of Class 11 Biology is Breathing and Exchange of Gases. It covers the human respiratory system, the mechanism of breathing, and gas exchange/transport in the body. These Class 11 Biology Chapter 14 solutions are also useful as quick revision notes before exams. Air passes through: nostrils → nasal cavity ...
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Chapter 15: Body Fluids and Circulation – Free PDF Download
Chapter 15 of Class 11 Biology is Body Fluids and Circulation. It covers the composition of blood and lymph, the human heart and cardiac cycle, and blood pressure regulation. These Class 11 Biology Chapter 15 solutions are also useful as quick revision notes before exams. Blood consists of plasma (fluid matrix, ~55%...
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Chapter 16: Excretory Products and their Elimination – Free PDF Download
Chapter 16 of Class 11 Biology is Excretory Products and their Elimination. It covers modes of nitrogenous waste excretion, the human excretory system, urine formation, and osmoregulation. These Class 11 Biology Chapter 16 solutions are also useful as quick revision notes before exams. Ammonotelism: excretion of amm...
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Chapter 17: Locomotion and Movement – Free PDF Download
Chapter 17 of Class 11 Biology is Locomotion and Movement. It covers the types of movement, the human skeletal and muscular systems, and the sliding filament mechanism of muscle contraction. These Class 11 Biology Chapter 17 solutions are also useful as quick revision notes before exams. Amoeboid (via pseudopodia, e...
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Chapter 18: Neural Control and Coordination – Free PDF Download
Chapter 18 of Class 11 Biology is Neural Control and Coordination. It covers the human nervous system, the structure and function of neurons, nerve impulse transmission, and the reflex arc. These Class 11 Biology Chapter 18 solutions are also useful as quick revision notes before exams. A neuron has three parts: cel...
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Chapter 19: Chemical Coordination and Integration – Free PDF Download
Chapter 19 of Class 11 Biology is Chemical Coordination and Integration, the final chapter of the syllabus. It covers the human endocrine system, hormones, and their regulatory mechanisms. These Class 11 Biology Chapter 19 solutions are also useful as quick revision notes before exams. Endocrine glands are ductless ...
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| Chapter | NCERT Solutions | Revision Notes | Extra Questions (HOTS) |
|---|---|---|---|
| Ch 1: The Living World – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 2: Biological Classification – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 3: Plant Kingdom – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 4: Animal Kingdom – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 5: Morphology of Flowering Plants – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 6: Anatomy of Flowering Plants – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 7: Structural Organisation in Animals – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 8: Cell - The Unit of Life – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 9: Biomolecules – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 10: Cell Cycle and Cell Division – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 11: Photosynthesis in Higher Plants – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 12: Respiration in Plants – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 13: Plant Growth and Development – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 14: Breathing and Exchange of Gases – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 15: Body Fluids and Circulation – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 16: Excretory Products and their Elimination – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 17: Locomotion and Movement – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 18: Neural Control and Coordination – Free PDF Download | Solutions | Revision Notes | Extra Questions |
| Ch 19: Chemical Coordination and Integration – Free PDF Download | Solutions | Revision Notes | Extra Questions |
Also see the Class 11 NCERT Books catalog for the official textbook PDF.
Frequently Asked Questions
Are these Class 11 Biology solutions updated for the 2026-27 syllabus?
Yes, every chapter listed above is checked against the current NCERT Biology textbook for the 2026-27 CBSE session.
Do you also have Extra Questions and Revision Notes for Class 11 Biology?
Yes — wherever published, Extra Questions and/or Revision Notes are linked next to the matching chapter above.
Are these Class 11 Biology NCERT Solutions available in Hindi medium?
Hindi-medium solutions for Class 11 Biology are being added progressively. In the meantime, this English-medium solution can be used alongside your Hindi-medium NCERT textbook, since the questions and chapter numbering are identical.