NCERT Books Class 11 Biotechnology: Chapter by Chapter

If you are looking for the NCERT Books Class 11 Biotechnology textbook, it is a single official volume — Biotechnology — with 12 chapters across 316 printed pages, and every chapter’s PDF is linked on this page.

The PDF is only the starting point. Below the download table sits a per-chapter index built from the book itself: each chapter’s numbered section headings, its verified numbered figures indexed from the textbook, its exercise questions, and the pages where they sit.

You can see where the diagrams, the question load and the longest chapters are before you download a thing.

NCERT Books Class 11 Biotechnology: Official Chapter-wise PDFs

All 12 files below are NCERT’s own official PDFs, hosted on ncert.nic.in, and free to download. The first chapter’s official PDF at https://ncert.nic.in/textbook/pdf/kebt101.pdf opens An Introduction to Biotechnology (pp. 1-22); chapters 2-12 follow the identical kebt1xx.pdf naming pattern shown in the table.

The Book by the Numbers: 12 Chapters, 316 Pages

The quick figures a student asks first, counted from the book itself:

• 12 chapters
• 316 printed pages
• 12 verified official PDFs linked below
• 155 named sections indexed
• 174 verified numbered figures indexed from the textbook
• 133 exercise questions

Grouped by what they teach, the chapters fall into three parts. The book is written to be read in that order — the foundation builds the vocabulary, the genetics block applies it, and the applied chapters assume both.

Two patterns are worth knowing before you begin. Chapter 3 and Chapter 12 together carry 48 of the book’s 133 exercise questions, so the practice load concentrates in those two chapters.

Chapters 9-11 form a compact bioinformatics block — 46 pages and 8 figures, the shortest stretch in the book. The book prints no activities in any of its 12 chapters, so the 174 indexed figures are the main visual material a self-studying student gets.

What’s Inside Each Chapter

The columns count what the index found: a section is one of NCERT’s own numbered headings, a figure is a numbered figure indexed from the book, a question is an end-of-chapter exercise, and an activity is a hands-on practical printed in the chapter — all 12 chapters show 0. The pages column gives each chapter’s span in the official PDF.

Chapter 1: An Introduction to Biotechnology (pp. 1-22)

Biotechnology means using living cells and biological molecules to generate useful products — and the idea is far older than the word. The chapter opens by tracing that story from the beginnings of crop cultivation, then hands over to the modern applications that define the field today.

1. Historical Perspectives (p. 4)
2. Applications of Modern Biotechnology (p. 8)
3. Biotechnology in India: Academic Prospects and Industrial Scenario (p. 16)

With 3 figures and 5 questions across 22 pages, this is the fastest chapter in the book to finish and a good warm-up read.

Chapter 2: G.N. Ramachandran (1922–2001) (pp. 23-49)

Despite the biography-style title, this is the cell-biology chapter. The cell is the basic unit of life, broadly prokaryotic or eukaryotic, and the chapter opens with the fluid mosaic model of the plasma membrane (NCERT, p. 27), then works through the organelles — cell wall, endomembrane system, mitochondria, plastids, ribosomes, and finally the nucleus and chromosome.

1. Plasma Membrane (p. 26)
2. Cell Wall (p. 29)
3. Endomembrane System (p. 31)
4. Mitochondria (p. 36)
5. Plastids (p. 37)
6. Ribosomes (p. 38)
7. Microbodies (p. 39)
8. Cytoskeleton (p. 40)
9. Cilia and Flagella (p. 41)
10. Centrosome and Centrioles (p. 42)
11. Nucleus (p. 43)
12. Chromosome (p. 45)

Despite the chapter’s name, this is really the cell-structure chapter: 21 named sections from the plasma membrane to the chromosome, 16 figures, and 13 questions testing the organelles.

Chapter 3: Biomolecules (pp. 50-84)

Carbohydrates are built from carbon, hydrogen and oxygen and are distributed through both animal and plant tissues. The chapter sorts them into four major classes, starting from monosaccharides such as glucose, then climbs the molecular ladder — fatty acids and lipids, amino acids, protein structure, nucleic acids.

1. Carbohydrates (p. 50)
2. Fatty Acids and Lipids (p. 59)
3. Amino Acids (p. 63)
4. Protein Structure (p. 67)
5. Nucleic Acids (p. 75)

With 30 figures and 30 questions, this is both the most figure-rich chapter and the heaviest practice chapter in the book.

Chapter 4: Enzymes and Bioenergetics (pp. 85-102)

Enzymes are catalysts that speed up biochemical reactions in living systems. Each enzyme has an active site into which the substrate fits precisely — the lock and key hypothesis (NCERT, p. 88) — and temperature, pH and substrate concentration all change how fast the reaction proceeds. The chapter ends with bioenergetics and the laws of thermodynamics.

1. Enzymes: Classification and Mode of Action (p. 85)
2. Brief Introduction to Bioenergetics (p. 96)

In 18 pages it packs 13 figures and 11 questions, and the figures include the inhibition plots a student revising enzyme kinetics needs.

Chapter 5: Cellular Processes (pp. 103-144)

All cells respond to signals through specific receptors, which sit either on the cell surface or inside the cytoplasm or nucleus. A ligand is the chemical messenger that triggers them. From signalling the chapter moves through metabolic pathways, the cell cycle, programmed cell death, cell differentiation and cell migration.

1. Cell Signaling (p. 103)
2. Metabolic Pathways (p. 104)
3. Cell Cycle (p. 126)
4. Programmed Cell Death (apoptosis) (p. 135)
5. Cell Differentiation (p. 136)
6. Cell Migration (p. 139)

20 figures carry the pathway diagrams — glycolysis, the citric acid cycle, the electron transport chain, photosynthesis — and 11 questions close the chapter.

Chapter 6: Basic Principles of Inheritance (pp. 145-165)

Characteristics that run in families have a genetic basis — information inherited from parents, true for plants and animals alike. The chapter opens with Mendel’s work on the seven pairs of contrasting pea traits (NCERT, p. 148), then moves beyond Mendel to linkage, crossing over, recombination, sex-linked and extrachromosomal inheritance, polyploidy and reverse genetics.

1. Introduction to Inheritance (p. 147)
2. Linkage and Crossing over (p. 153)
3. Recombination (p. 156)
4. Sex-Linked Inheritance (p. 158)
5. Extrachromosomal Inheritance (p. 159)
6. Polyploidy (p. 160)
7. Reverse Genetics (p. 161)

It carries 14 figures — including the monohybrid and dihybrid cross diagrams — yet only 7 questions; here the figures matter more than the question count.

Chapter 7: Basic Processes (pp. 166-216)

The chapter opens in 1869, when Miescher first isolated DNA from pus-cell nuclei. Genetic material, it explains, can transfer between cells and alter their make-up — Griffith’s transforming principle (NCERT, p. 167), confirmed by the Hershey-Chase experiment (p. 169). From there it covers gene organisation, replication, expression, the genetic code, translation, mutation, DNA repair and the lac operon.

1. DNA as the Genetic Material (p. 166)
2. Prokaryotic and Eukaryotic Gene Organisation (p. 171)
3. DNA replication cluster (section 7.3) — the index holds this block under its subsections:
   • Messelson and Stahl experiment (p. 176)
   • Interpretation of results (p. 178)
   • The machinery of replication (p. 179)
   • Mechanism of DNA replication (p. 180)
4. Gene Expression (p. 184)
5. Genetic Code (p. 191)
6. Translation (p. 193)
7. Gene Mutation (p. 199)
8. DNA Repair (p. 205)
9. Regulation of Gene Expression (p. 208)

At 51 pages and 39 figures, this is the longest chapter in the book and the one with the most diagrams, yet it sets only 7 questions — a reading chapter, not a practice chapter.

Chapter 8: Genetic Disorder (pp. 217-232)

Haploid cells carry one copy of each chromosome; diploid cells carry two. Any deviation — a chromosome absent or present in extra copies — counts as a chromosomal abnormality. The chapter works through structural and numerical abnormalities and their syndromes, then closes with polygenic disorders (hypertension, coronary heart disease, diabetes).

1. Chromosomal Abnormalities and Syndromes (p. 217)
2. Polygenic Disorders (hypertension, coronary heart disease, and diabetes) (p. 227)

The index captured only these two top-level headings (8.1 and 8.3); the ten figures between them cover sickle cell disease, achondroplasia and X-linked inheritance. It is the leanest chapter in the book — 4 named sections, 10 figures and 5 questions on 16 pages.

Chapter 9: Introduction to Bioinformatics (pp. 233-255)

Bioinformatics is an interdisciplinary field that uses computational and statistical techniques to store, retrieve and analyse biological information. The chapter starts with the basic mathematics and statistics behind biological systems, moves through the biological databases that organise molecular data, and ends with genome informatics and the role of artificial intelligence.

1. The Utility of Basic Mathematical and Statistical Concepts to Understand Biological Systems and Processes (p. 235)
2. Introduction (p. 239)
3. Biological Databases (p. 244)
4. Genome Informatics (p. 247)
5. Role of Artificial Intelligence (AI) in Future (p. 253)

Only 4 figures and 11 questions sit across its 23 pages — the content lives in databases and data formats rather than diagrams.

Chapter 10: Protein Informatics and Cheminformatics (pp. 256-269)

Protein informatics collects information about any protein using computational techniques; cheminformatics does the same for chemical compounds. In both halves the data moves from storage and management toward real ends — computational prediction of protein structure in one case, and the journey of a drug in the other.

1. Protein Informatics (p. 256)
2. Cheminformatics (p. 261)

It holds the leanest figure count in the book — 2 figures and 6 questions — because it runs on definitions and pipelines such as structure prediction and Lipinski’s rule of five rather than on diagrams.

Chapter 11: Programming and Systems Biology (pp. 270-278)

Biology now produces so much data that competent handling of complex datasets — and the hypotheses built from them — needs programming. Systems biology, the second half of the chapter, is the interdisciplinary study of complex biological interactions within biological systems.

1. Programming in Biology (p. 270)
2. Systems Biology (p. 272)
   • Introduction (p. 272)
   • Historical perspective (p. 272)
   • Theme behind the systems biology (p. 274)
   • Protocol for systems biology experiments (p. 274)
   • Model-analysis methods (p. 277)

The index repeats the 11.1 and 11.2 labels; the list above uses the second paginated pair. It is the shortest chapter at 9 pages, yet it sets 9 questions — the highest question density in the book.

Chapter 12: Tools and Techniques (pp. 279-316)

Simple light microscopy reveals what is too small for the naked eye, but the internal organisation of cells demands far more. This chapter is the book’s laboratory tour: microscopy (NCERT, p. 281), then centrifugation, electrophoresis, ELISA, chromatography, spectroscopy, DNA sequencing and flow cytometry.

1. Microscopy (p. 281)
2. Centrifugation (p. 286)
3. Electrophoresis (p. 287)
4. Enzyme-Linked Immunosorbent Assay (ELISA) (p. 291)
5. Chromatography (p. 294)
6. Spectroscopy (p. 297)
7. Mass Spectrometry (p. 301)
8. Fluorescence in Situ Hybridisation (FISH) (p. 301)
9. DNA Sequencing (p. 303)
10. Flow Cytometry (p. 311)

With 22 named sections — the most in the book — plus 21 figures and 18 questions across 38 pages, it is the second heaviest practice chapter and the natural reference for every technique named earlier.

Chapter Study Pages

For chapters of this book that have a dedicated study page on this site, it is linked here — one click from the PDF table to the chapter’s own teaching page.

How to Use This Book for Revision

1. Read Chapter 1 first as a warm-up — 22 pages and 5 questions, and it frames the whole subject in one sitting.
2. Study Chapter 2 for cell structure before any biochemistry; this is the anatomy the later chapters assume.
3. Pair Chapter 3 (Biomolecules) with Chapter 4 (Enzymes and Bioenergetics) — molecule types first, then the catalysts that act on them. Reading Chapter 3 before Chapter 4, and Chapter 4 before Chapter 5, matches the order in which the book builds molecules into metabolic pathways.
4. Chapter 5 (Cellular Processes) assumes both, and its metabolism figures reuse the same molecules.
5. Keep the genetics block in order: Chapter 6 on inheritance principles, then Chapter 7 on DNA, replication, expression and regulation, then Chapter 8 on disorders.
6. Treat Chapters 9-11 as one compact informatics unit — the three chapters together span fewer pages than Chapter 7 alone.
7. Use Chapter 12 as a reference shelf: whenever a technique is named in Chapters 5, 7, 9 or 10, look up its instrument here.

One honest warning: Chapter 7 is 51 pages of dense diagrams and must not be left for the night before. And textbook contents and the examinable syllabus are not always identical — check the current official syllabus.

Related Resources

This listing is maintained for the 2026-27 academic session using the NCERT textbook information available to us. NCERT remains the authority for confirming the latest edition.

If this page helped, the next stops are already on this site:

• NCERT books directory — every indexed textbook across classes, in one place.
• Class 11 hub — the other Class 11 subjects this site indexes.

Sources and Data Verification

• The figures and counts on this page come from the NCERT Class 11 Biotechnology textbook, official edition on ncert.nic.in — the edition this site indexes. Section titles, figure captions and page references are quoted or taken from that PDF.
• What this page covers: the 12 chapters of this textbook in its English edition. It does not cover the CBSE curriculum or syllabus, which is larger and includes subjects this directory does not index.
• This listing is maintained for the current academic session using the NCERT information available to us.
• Which authority settles what: NCERT for the textbook, its editions and its PDFs; CBSE for the curriculum, syllabus and examinations.

Reference: NCERT Class 11 Biotechnology textbook, official edition on ncert.nic.in. Figure captions and section titles quoted from the textbook; page references are to the official PDF.

Frequently Asked Questions

How many chapters are in the NCERT Class 11 Biotechnology book?

There are 12 chapters, spanning 316 printed pages from An Introduction to Biotechnology (pp. 1-22) to Tools and Techniques (pp. 279-316). The chapter-wise PDF table above lists all 12 with their page ranges.

Is the Class 11 Biotechnology PDF official and free?

Yes. The PDFs linked above are NCERT’s own files, hosted on ncert.nic.in, and they are free to download for all 12 chapters. Every link points to the official source; the site does not host copies of the files itself.

Which chapter covers Mendel’s laws and inheritance?

Mendel’s work and the principles of inheritance sit in Chapter 6, Basic Principles of Inheritance (pp. 145-165). It covers the monohybrid and dihybrid crosses, linkage and crossing over, recombination, and sex-linked and extrachromosomal inheritance.

Which chapter covers DNA replication, the genetic code and gene expression?

DNA replication, the genetic code, translation and gene expression sit in Chapter 7, Basic Processes (pp. 166-216). The same chapter establishes DNA as the genetic material and covers mutation, DNA repair and the lac operon.

Which chapter explains lab techniques like electrophoresis and DNA sequencing?

Chapter 12, Tools and Techniques (pp. 279-316), explains laboratory techniques including microscopy, centrifugation, electrophoresis, ELISA, chromatography, spectroscopy, DNA sequencing and flow cytometry. It has the largest section count in the book at 22 named sections.