Biology Text Book 9th Class English Medium

Biology is the science of life. The word "Biology" comes from two Greek words i.e., "bios" (life) and "logos" (study). It explores the structures, functions, and interactions of living organisms. Understanding Biology helps us to address issues related to health, food, and the environment. Biology offers a fascinating journey of discovery from the microscopic world of bacteria to the vast ecosystems of our planet.

Class09th Class
GroupBio Group
SubjectBiology
MediumEnglish Medium
Curriculum AuthorityPunjab Education, Curriculum, Training and Assessment Authority (PECTAA)
Academic Year2026–27

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Chapters

Chapter 1 – THE SCIENCE OF BIOLOGY

Fundamental concepts of biological study, scientific methods, and interdisciplinary career fields.

  • Biology and its Branches
  • Relation of Biology with Other Sciences
  • Careers in Biology
  • Quranic Instructions to Reveal the Study of Life
  • Science as a Collaborative Field
  • Scientific Method
  • Theory and Law/Principle
  • Malaria -An Example of Biological Method

Chapter 2 – BIODIVERSITY

Classification system, taxonomy, domains, and naming conventions for living organisms.

  • Biodiversity
  • Classification
  • Taxonomic Ranks
  • History of Classification
  • Domains of Living Organisms
  • Classification of Domain Eukarya
  • Status of Virus in Classification
  • Binomial Nomenclature

Chapter 3 – THE CELL

Cellular structure, organelle specialization, and structural differences in organisms.

  • Cell
  • Structure of Cell
  • Structural Advantages of Plant and Animal Cells
  • Cell Specialization
  • Stem Cells

Chapter 4 – CELL CYCLE

Cell division processes including nuclear division, mitosis, and meiosis mechanisms.

  • Cell Cycle
  • Mitosis
  • Meiosis
  • Comparison between Meiosis and Mitosis

Chapter 5 – TISSUES, ORGANS, AND ORGAN SYSTEMS

Biological organization levels, organ systems, and internal homeostasis mechanisms.

  • Levels of Organization
  • Organs and Organ Systems in Plants
  • Organs and Organ Systems in Humans
  • Homeostasis

Chapter 6 – BIOMOLECULES

Structure, properties, and biological roles of essential organic macromolecules.

  • Biomolecules
  • Carbohydrates
  • Proteins
  • Lipids
  • Nucleic Acids
  • The Working of DNA and RNA

Chapter 7 – ENZYMES

Metabolic processes, catalytic actions of enzymes, and factors influencing enzyme activity.

  • Metabolism
  • Enzymes
  • Mechanism of Enzyme Action
  • Factors that Affect the Activity of Enzymes
  • Enzyme Inhibition

Chapter 8 – BIOENERGETICS

Energy transformations, photosynthesis mechanisms, cellular respiration, and ATP utilization.

  • ATP: The Cell's Energy Currency
  • Photosynthesis
  • Cellular Respiration

Chapter 9 – PLANT PHYSIOLOGY

Plant nutrition, transpiration, transport systems, gaseous exchange, and excretion.

  • Nutrition in Plants
  • Transport in Plants
  • Transpiration
  • Transport of Water and Salts in Plants
  • Translocation of Food in Plants
  • Gaseous Exchange in Plants
  • Mechanisms for Excretion in Plants
  • Osmotic Adjustments in Plants

Chapter 10 – REPRODUCTION IN PLANTS

Asexual propagation methods and mechanisms of sexual reproduction in plant species.

  • Types of Asexual Reproduction
  • Artificial Propagation
  • Sexual Reproduction in Plants

Chapter 11 – BIOSTATISTICS

Application of statistical tools, central tendency measures, and data analysis in biology.

  • Introduction to Biostatistics
  • Mean, Median, and Mode
  • Bar Chart

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