Biology Tech Class 9 English Medium PDF Download – Punjab Board (PCTB)

Biology Tech for Class 9 English Medium is published by the Punjab Curriculum and Textbook Board (PCTB) and is based on the Revised National Curriculum of Pakistan 2023. It is the official biology textbook for 9th class students enrolled in the Tech (vocational/technical) stream.

For Tech stream students, this book covers biology in a shorter, more focused format than the regular pre-medical course. It is built for board exam preparation, with each chapter’s summary and short-answer questions here helping students revise the core concepts quickly in English.

Book Overview

Class	9th Class / Matric Part 1
Subject	Biology Tech
Medium	English
Stream	Tech (Vocational / Technical)
Board	Punjab Curriculum and Textbook Board (PCTB)
Edition	2025-26 (National Curriculum of Pakistan 2023)
Total Chapters	9 (+ Glossary)
Format	PDF (Free Download)

Chapter List

Chapter 1: The Science of Biology

This chapter defines Biology as the science of life and introduces its three major fields — Zoology, Botany, and Microbiology — along with sub-fields like Cytology, Genetics, Ecology, and Pathology. It also explains the steps of the scientific method and the difference between a hypothesis, a theory, and a law, using the study of malaria as a real example of the scientific method in action.

Important Questions:

• What are the three major fields of Biology? Zoology (study of animals), Botany (study of plants), and Microbiology (study of microorganisms).
• What does Cytology study? Cells — the building blocks of life — including their structures, organelles, and mechanisms of division.
• What is the difference between a theory and a law in science? A theory explains why something happens based on tested evidence, while a law describes what happens, usually as a mathematical or observational statement, without explaining the cause.
• Why is malaria used as an example in this chapter? To demonstrate how the scientific method — observation, hypothesis, experiment, and conclusion — is applied to solve a real biological problem.

Chapter 2: Biodiversity

This chapter explains biodiversity as the variety of organisms in an area and its role in ecosystem stability, climate regulation, and economic benefits like agriculture and pharmaceuticals. It covers classification and the seven taxonomic ranks devised by Carl Linnaeus in 1735 — kingdom, phylum, class, order, family, genus, and species — plus the domain rank added in 1977, and the binomial nomenclature system used to name organisms.

Important Questions:

• Who devised the system of taxonomic ranks, and when? Swedish botanist Carl Linnaeus, in 1735.
• What are the three domains into which all organisms are classified? Archaea, Bacteria, and Eukarya.
• What are the four kingdoms within Domain Eukarya? Animalia, Plantae, Fungi, and Protista.
• Why does biodiversity matter for climate regulation? Plants and algae absorb carbon dioxide, helping keep the climate balanced.

Chapter 3: The Cell

This chapter describes the cell as the basic unit of life, tracing its discovery to Robert Hooke in 1665 and the nucleus to Robert Brown in 1831. It explains the structure of the cell wall (middle lamella, primary and secondary walls) and the fluid-mosaic model of the cell membrane, comparing the structures of prokaryotic and eukaryotic, plant and animal cells.

Important Questions:

• Who discovered the cell, and how? Robert Hooke, in 1665, by examining a thin slice of cork under a simple microscope.
• Who discovered the nucleus, and when? Robert Brown, in 1831, while studying plant cells under a microscope.
• What are the three layers of a plant cell wall? Middle lamella, primary wall, and secondary wall.
• What does the fluid-mosaic model describe? The structure of the cell membrane, where protein molecules float within a fluid lipid bilayer.

Chapter 4: Cell Cycle

This chapter explains the three sub-phases of interphase (G1, S, G2) and the G0 phase where some cells like neurons permanently stop dividing. It then covers why mitosis matters in practice — driving growth, replacing dying cells like red blood cells, enabling regeneration in animals such as sea stars, and even powering asexual reproduction through budding in Hydra.

Important Questions:

• What happens during the S phase of interphase? The DNA of each chromosome is replicated, so each chromosome ends up with two sister chromatids.
• Which body cells are constantly replaced through mitosis? Red blood cells and the cells lining the intestine and skin, which die regularly and are replaced by identical new copies.
• How does Hydra use mitosis to reproduce asexually? Mitosis forms a mass of cells called a bud on its surface, which keeps dividing until it grows into a new individual.
• Which animal is given as an example of regeneration through mitosis? The sea star, which can regrow body parts using new cells formed by mitosis.

Chapter 5: Tissues, Organs, and Organ Systems

This chapter traces the levels of biological organization from atom to molecule, organelle, cell, tissue, organ, organ system, and finally organism. It uses the leaf as an example of a plant organ — explaining its epidermal and mesophyll tissues — and the stomach as an example of an animal organ made of multiple tissue types working together.

Important Questions:

• What is a tissue? A group of similar cells that work together to perform one or more specific functions.
• List the levels of organization from simplest to most complex. Atom, molecule, organelle, cell, tissue, organ, organ system, organism.
• What is the function of stomata in the leaf’s epidermal tissue? They control gas exchange and the loss of water vapour.
• Give one example of an organ system in animals and one in plants. Circulatory system in animals; root system in plants.

Chapter 6: Enzymes

This chapter defines metabolism and its two sub-sets, catabolism (breaking down molecules, like cellular respiration) and anabolism (building molecules, like photosynthesis). It explains enzymes as protein catalysts with specific active sites, describes cofactors like prosthetic groups and coenzymes, and covers real-world uses of enzymes in the food, paper, detergent, and fermentation industries.

Important Questions:

• What is the difference between catabolism and anabolism? Catabolism breaks down complex molecules and releases energy; anabolism builds complex molecules and consumes energy.
• Why are enzymes described as highly specific? Each enzyme’s globular structure forms an active site that binds to only one particular type of substrate.
• What is a cofactor? A non-protein molecule, such as a metal ion or vitamin, that many enzymes need to become fully active.
• Give one industrial use of enzymes. Protease enzymes are used in biological detergents to remove protein stains from clothes.

Chapter 7: Bioenergetics

This chapter introduces ATP as the cell’s energy currency, made of adenine, ribose, and three phosphate groups, releasing about 7.3 kcal per mole when a phosphate bond breaks. It explains photosynthesis — the conversion of carbon dioxide and water into glucose using light energy — through its light and dark reactions, and covers cellular respiration as the process that releases energy from food.

Important Questions:

• What are the three subunits of an ATP molecule? Adenine, ribose (a five-carbon sugar), and three phosphate groups.
• Who proposed that ATP is the main energy-transfer molecule in the cell? Fritz Lipmann, in 1941.
• Where do the light reactions of photosynthesis take place? On the thylakoid membranes of chloroplasts.
• What is the general word equation for photosynthesis? Carbon dioxide + water + light energy → glucose + oxygen + water.

Chapter 8: Plant Physiology

This chapter explains how roots absorb water and salts through root hairs using both active transport (for salts) and osmosis (for water), before the water moves through the cortex, endodermis, pericycle, and into the xylem. It also covers transpiration — water loss through stomata — the mechanism of water and food transport, and how plants make osmotic adjustments.

Important Questions:

• What are root hairs, and what is their function? Tiny hair-like extensions of epidermal cells that absorb water and salts from the soil due to their large surface area.
• How do salts move into root hairs, compared to water? Salts move in by active transport (using energy), while water moves in by osmosis (passive transport).
• What is transpiration? The loss of water in the form of vapour from the plant surface, mainly through stomata in leaves.
• Which tissue transports water and salts in plants, and which transports food? Xylem transports water and salts; phloem transports food.

Chapter 9: Reproduction in Plants

This chapter distinguishes vegetative propagation (natural asexual reproduction using stems, suckers, or leaves) from artificial propagation (human-assisted methods like cuttings and grafting). It covers stem types used in natural propagation — stolons, tubers, rhizomes, bulbs, and corms — with real examples like strawberry, potato, and ginger, and introduces sexual reproduction in plants.

Important Questions:

• What is vegetative propagation? A method of asexual reproduction where a new plant grows from a vegetative part (root, stem, or leaf) of the parent plant.
• Give an example of a plant that reproduces by tubers. Potato, which uses its underground fleshy stem with “eyes” (buds) to grow new plants.
• What is a sucker, and give an example? A new shoot that emerges from the base or roots of a parent plant, such as in banana plants.
• Name two methods of artificial vegetative propagation. Stem cuttings and grafting.

The book also includes a Glossary explaining key biology terms used across all nine chapters.

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Download Biology Tech Class 9 English Medium PDF

Click the button below to download the official PCTB Biology Tech English Medium book for free.

2025-26 Edition (PCTB – National Curriculum 2023)

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Who Should Read This

This book is for 9th class Tech stream students studying Biology in English medium under Punjab Board. It is a shorter and more focused version of the regular Biology course, designed specifically for vocational and technical education students preparing for their board exams.

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Applicable Boards

PCTB publishes this Biology Tech textbook for the Tech stream, and it is used across every Punjab Board affiliated school offering that stream — Lahore, Gujranwala, Faisalabad, Multan, Sargodha, Rawalpindi, Sahiwal, and DG Khan among them.

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