NCERT Books

CBSE 1st Puc Biology Textbook Pdf PDF – NCERT 2026-27

1st Puc Biology Textbook Pdf CBSE NCERT – Free PDF Download 2026-27

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About 1st Puc Biology Textbook Pdf

1st puc biology textbook pdf provides comprehensive study materials covering essential biological concepts for first-year pre-university students. The latest edition textbook includes detailed chapters on Cell Biology, Biomolecules, Plant Physiology, Human Physiology, and Genetics. Students can download free PDF versions containing all fundamental topics like cell structure, photosynthesis, respiration, circulation, and reproduction.

Each chapter features clear diagrams, practical experiments, and solved examples aligned with NCERT and CBSE guidelines. The 2026-27 edition incorporates updated syllabus changes and examination patterns. Key chapters include "The Living World," "Biological Classification," "Plant Kingdom," "Animal Kingdom," and "Morphology of Flowering Plants." Students benefit from structured content presentation with chapter-wise exercises and previous year questions. The PDF format enables easy navigation through topics and bookmark important sections. Study tips include creating chapter summaries, practicing diagram labeling, and solving end-chapter questions regularly. Students should focus on understanding biological processes rather than memorizing facts. The free PDF download eliminates financial barriers, making quality education accessible to all students pursuing biology at the pre-university level.

Important Points to Remember – Class 1 Biology

  • Cell is the basic structural and functional unit of life, discovered by Robert Hooke in 1665 while observing cork cells under a microscope.
  • All living organisms are composed of cells – unicellular organisms have one cell while multicellular organisms have multiple cells working together.
  • Cell theory states: all living things are made of cells, cell is the basic unit of life, and all cells arise from pre-existing cells.
  • Prokaryotic cells lack a membrane-bound nucleus (bacteria, blue-green algae) while eukaryotic cells have a well-defined nucleus surrounded by nuclear membrane.
  • Cell membrane is selectively permeable and controls the entry and exit of substances using phospholipid bilayer structure.
  • Cytoplasm is the jelly-like substance between cell membrane and nucleus, containing various organelles and dissolved substances.
  • Nucleus controls all cellular activities and contains chromosomes made of DNA and proteins called chromatin material.
  • Mitochondria are called powerhouses of the cell as they produce ATP energy through cellular respiration processes.
  • Chloroplasts contain chlorophyll pigment and carry out photosynthesis in plant cells, converting light energy into chemical energy.
  • Ribosomes are protein factories of the cell, synthesizing proteins using information from DNA via mRNA.
  • Vacuoles store water and maintain turgor pressure in plant cells, while animal cells have small temporary vacuoles.
  • Cell wall provides structural support and protection to plant cells, fungi, and bacteria but is absent in animal cells.
  • Endoplasmic reticulum (ER) forms a network of membranes – rough ER has ribosomes while smooth ER lacks ribosomes.
  • Golgi apparatus modifies, packages, and transports proteins and lipids received from endoplasmic reticulum.
  • Lysosomes contain digestive enzymes and are called suicide bags as they digest worn-out organelles and foreign substances.

Quick Revision Notes – Class 1 Biology

  • Remember the chronological discovery of cell: Robert Hooke (1665) saw dead cork cells, Leeuwenhoek (1674) observed living cells, leading to cell theory by Schleiden and Schwann (1838-39).
  • Use the mnemonic "CPR" for cell theory: Cells make all living things, Pre-existing cells create new cells, Reproduction happens through cell division.
  • Distinguish prokaryotes vs eukaryotes: "Pro" means before nucleus (primitive), "Eu" means true nucleus (advanced) – this helps in 2-mark questions.
  • For cell membrane structure questions, focus on fluid mosaic model with phospholipid bilayer, cholesterol, and embedded proteins allowing selective permeability.
  • In diagram-based questions worth 5 marks, always label nucleus, cytoplasm, cell membrane, mitochondria, and one specific organelle like chloroplast or ribosome.
  • Mitochondria have double membrane with inner folds called cristae – remember this for ATP production and cellular respiration explanations.
  • Plant cell vs animal cell comparison is frequently asked – plant cells have cell wall, chloroplasts, and large vacuole which animal cells lack.
  • For photosynthesis questions, connect chloroplasts → chlorophyll → light energy → glucose production → oxygen release as byproduct.
  • Protein synthesis pathway: DNA → transcription in nucleus → mRNA → ribosomes → translation → protein formation – crucial for 3-mark answers.
  • Endoplasmic reticulum types: Rough ER (with ribosomes) for protein synthesis, Smooth ER (without ribosomes) for lipid synthesis and detoxification.
  • Golgi apparatus functions as "post office of cell" – receives from ER, modifies, packages, and ships to destinations within or outside cell.
  • Lysosome’s digestive function: contains hydrolytic enzymes, digests food particles, removes waste, breaks down worn organelles – hence called "suicide bags."
  • Vacuole differences: plant cells have one large central vacuole for water storage and maintaining turgor pressure, animal cells have multiple small vacuoles.
  • Cell division basics: mitosis produces identical diploid cells for growth, meiosis produces genetically different gametes for reproduction.
  • For practical exam preparation, practice drawing and labeling onion peel cells (plant) and cheek cells (animal) showing key structural differences.

Frequently Asked Questions


The official NCERT biology textbook for Class 11 can be downloaded free from the NCERT official website (ncert.nic.in) under the textbooks section. The PDF includes all chapters covering topics from cell biology to plant and animal physiology. Always use official sources to ensure you have the latest curriculum updates and accurate content for board exam preparation.


The NCERT Class 11 biology textbook contains 22 chapters organized into five units: Diversity in Living World, Structural Organization, Cell Structure and Function, Plant Physiology, and Human Physiology. Key chapters include The Living World, Cell Theory, Biomolecules, Photosynthesis, Respiration, Neural Control, and Chemical Coordination. Each chapter builds foundational concepts essential for Class 12 biology and competitive exams.


The NCERT biology textbook serves as the primary reference with all concepts, diagrams, and examples directly aligned with CBSE board exam patterns. It contains solved examples, chapter-end exercises, and summary points that form the basis for 80% of board exam questions. Regular study from this textbook ensures comprehensive coverage of the syllabus and builds strong conceptual foundation for higher secondary biology.


Focus on understanding biological processes through flowcharts and concept maps while reading each chapter sequentially. Practice drawing and labeling all diagrams as they carry significant marks in board exams, and solve all NCERT exercises for concept reinforcement. Make chapter-wise notes highlighting key terms, definitions, and important points for quick revision before examinations.


Yes, the NCERT biology textbook provides comprehensive coverage of the entire CBSE Class 11 syllabus and forms the foundation for board exam questions. However, supplement it with previous years’ question papers, sample papers, and additional practice exercises for better exam preparation. The textbook’s end-chapter questions and summary sections are particularly valuable for revision and understanding the exam question format.