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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, The Living World, opens Class 11 Biology by asking a deceptively simple question — what does it mean to be "alive"? It then moves into the practical side of biology: how scientists give every organism a single, universally accepted scientific name (binomial nomenclature), and how millions of species are o...
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Chapter 2: Biological Classification – Free PDF Download
Chapter 2, Biological Classification, moves beyond Aristotle's and Linnaeus's two-kingdom system to explain R.H. Whittaker's five-kingdom classification (Monera, Protista, Fungi, Plantae, Animalia), the criteria used to build it (cell structure, body organisation, mode of nutrition, reproduction, and phylogenetic re...
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Chapter 3: Plant Kingdom – Free PDF Download
Chapter 3, Plant Kingdom, takes the broad five-kingdom framework from Chapter 2 and zooms into Plantae, walking through algae, bryophytes, pteridophytes, gymnosperms and angiosperms in order of increasing structural complexity. Along the way it explains how reproductive strategies changed as plants moved from water ...
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Chapter 4: Animal Kingdom – Free PDF Download
Chapter 4, Animal Kingdom, is one of the longest and most important chapters in Class 11 Biology because it classifies the entire animal world – from simple sponges to complex mammals – using fundamental features such as body symmetry, coelom, segmentation, and notochord. The NCERT exercise for this chapter has 15 q...
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Chapter 5: Morphology of Flowering Plants – Free PDF Download
Chapter 5 of Class 11 Biology, Morphology of Flowering Plants, deals with the external structure of the root, stem, leaf, inflorescence, flower, fruit and seed in angiosperms, and introduces the precise scientific vocabulary used to describe a flower — aestivation, placentation, symmetry, and the position of floral ...
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Chapter 6: Anatomy of Flowering Plants – Free PDF Download
Chapter 6, Anatomy of Flowering Plants, takes students inside the plant body to study its tissues and tissue systems in detail. It builds on the tissue basics from earlier classes and explains meristematic and permanent tissues, the epidermal, ground and vascular tissue systems, and how these are organised different...
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Chapter 7: Structural Organisation in Animals – Free PDF Download
Class 11 Biology Chapter 7, Structural Organisation in Animals, explains how cells, tissues, organs and organ systems combine to divide labour inside a multicellular animal body, and then uses the frog (Rana tigrina) as a case study to illustrate this organisation at the level of a whole vertebrate. In the current (...
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Chapter 8: Cell - The Unit of Life – Free PDF Download
Chapter 8, "Cell – The Unit of Life", introduces the cell as the fundamental structural and functional unit of all living organisms, tracing the development of cell theory and contrasting the simple organisation of prokaryotic cells with the compartmentalised, organelle-rich structure of eukaryotic cells. It covers ...
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Chapter 9: Biomolecules – Free PDF Download
Chapter 9, Biomolecules, takes a chemical view of the living cell, explaining how carbon compounds such as amino acids, sugars, fatty acids and nucleotides combine to form the four major biomacromolecules of life: proteins, polysaccharides, nucleic acids and lipids. It also builds up the four levels of protein struc...
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Chapter 10: Cell Cycle and Cell Division – Free PDF Download
Chapter 10, Cell Cycle and Cell Division, explains how a cell grows, copies its genetic material and splits into daughter cells through an orderly sequence of events called the cell cycle. It covers interphase (the G1, S and G2 sub-phases), the four stages of mitosis — prophase, metaphase, anaphase and telophase — a...
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Chapter 11: Photosynthesis in Higher Plants – Free PDF Download
Chapter 11, Photosynthesis in Higher Plants, explains how green plants trap light energy and convert it into chemical energy stored in carbohydrates. It covers the photosynthetic pigments, the light reaction (the Z scheme and cyclic/non-cyclic photophosphorylation), the Calvin cycle (C3 pathway), the Hatch-Slack or ...
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Chapter 12: Respiration in Plants – Free PDF Download
Chapter 12, Respiration in Plants, explains how plant cells break down glucose through glycolysis, fermentation, and aerobic respiration (the Krebs' cycle and electron transport system) to release energy trapped as ATP. It also covers the respiratory balance sheet, why the respiratory pathway is called amphibolic, a...
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Chapter 13: Plant Growth and Development – Free PDF Download
Chapter 13, Plant Growth and Development, explains how a plant builds its body — from an irreversible increase in cell size and number (growth), through the maturation of cells into specialised tissues (differentiation), to the complete sequence of events from seed germination to senescence (development). It also co...
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Chapter 14: Breathing and Exchange of Gases – Free PDF Download
Chapter 14, Breathing and Exchange of Gases, explains how humans take in oxygen and remove carbon dioxide through the respiratory system, covering the mechanism of breathing (based on Boyle's law and pressure gradients), respiratory volumes and capacities, the transport of O2 and CO2 in blood, and the neural regulat...
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Chapter 15: Body Fluids and Circulation – Free PDF Download
Class 11 Biology Chapter 15, Body Fluids and Circulation, explains how blood and lymph keep every cell of the body supplied with oxygen and nutrients while removing waste, and how the four-chambered human heart drives this transport through a cardiac cycle of systole and diastole. The chapter builds up from blood co...
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Chapter 16: Excretory Products and their Elimination – Free PDF Download
Chapter 16, Excretory Products and their Elimination, explains how animals remove nitrogenous wastes such as ammonia, urea and uric acid from their bodies, and takes a detailed look at the human excretory system - the kidneys, ureters, urinary bladder and urethra. It covers nephron structure, the three steps of urin...
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Chapter 17: Locomotion and Movement – Free PDF Download
Class 11 Biology Chapter 17, Locomotion and Movement, explains how movement is a defining feature of living organisms and covers the amoeboid, ciliary and muscular types of movement seen in the human body. The chapter goes on to explore the structure of the sarcomere and the sliding filament mechanism of muscle cont...
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Chapter 18: Neural Control and Coordination – Free PDF Download
Chapter 18, Neural Control and Coordination, explains how the human nervous system detects, processes and responds to stimuli. It covers the structure of a neuron, the generation and conduction of the nerve impulse (resting potential, action potential, saltatory conduction), transmission across a synapse, the organi...
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Chapter 19: Chemical Coordination and Integration – Free PDF Download
Chapter 19, Chemical Coordination and Integration, is the last chapter of the NCERT Class 11 Biology textbook. It explains how the human endocrine system works alongside the nervous system to coordinate body functions, covering the major endocrine glands (hypothalamus, pituitary, pineal, thyroid, parathyroid, thymus...
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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.