ICSE Class 9 Biology Syllabus 2026-27

Introduction

The ICSE Class 9 Biology syllabus for the academic session 2026-27 introduces students to the study of living organisms across four major themes: diversity, cell biology, plant physiology, and human biology. Designed as a preparatory year for the ICSE stream, the Class 9 Biology curriculum builds foundational knowledge and scientific thinking skills that are directly assessed in the ICSE Class 11 and Class 12 board examinations. Both theory and practical work are central to the ICSE Biology syllabus.

This page provides a comprehensive overview of the ICSE Class 9 Biology syllabus 2026-27, including the exam pattern, unit-wise topic breakdown, practical syllabus, chapter overview table, marking scheme, recommended books, preparation strategies, and frequently asked questions.

Quick Facts: ICSE Class 9 Biology 2026-27

Note: Class 9 in ISC-affiliated schools is a preparatory year. CISCE board examinations for Biology begin from Class 11. All Class 9 assessments are school-conducted, following the CISCE-prescribed curriculum and examination pattern.

Exam Pattern: ICSE Class 9 Biology 2026-27

Class 9 Biology assessments are school-conducted and follow the ICSE examination format to prepare students for board-level questions from Class 11 onwards. The theory paper tests knowledge, comprehension, application, and analysis across all units.

Detailed Unit-wise and Topic-wise Syllabus

Unit 1: Diversity of Life

This unit introduces students to the enormous variety of living organisms and the scientific systems used to classify them. Understanding biodiversity and classification provides the framework for all further biological study.

Classification of Living Organisms

•       Need for classification and the five-kingdom classification system

•       Kingdom Monera: bacteria (structure, types, economic importance)

•       Kingdom Protista: protozoans and algae (examples and characteristics)

•       Kingdom Fungi: general characters, types, economic importance (beneficial and harmful)

•       Kingdom Plantae: overview of major plant groups including Thallophyta, Bryophyta, Pteridophyta, Gymnosperms, and Angiosperms

•       Kingdom Animalia: overview from Porifera to Chordata, with characteristics of each phylum

•       Binomial nomenclature and taxonomic hierarchy: Kingdom, Phylum, Class, Order, Family, Genus, Species

Unit 2: The Cell: The Unit of Life

Cell biology is the cornerstone of biological understanding. This unit covers the structure and function of the cell and its organelles, and the key differences between plant and animal cells.

Cell Structure and Function

•       Cell theory: historical development and significance

•       Prokaryotic and eukaryotic cells: key structural differences

•       Plant cell vs. animal cell: structural comparison

•       Cell organelles and their functions: cell wall, cell membrane, nucleus, mitochondria, chloroplast, endoplasmic reticulum (rough and smooth), ribosomes, Golgi apparatus, lysosomes, vacuoles, centrosome

•       Cell membrane: fluid mosaic model, selective permeability

•       Osmosis, diffusion, and active transport

Cell Division

•       Significance of cell division: growth, repair, and reproduction

•       Mitosis: stages (prophase, metaphase, anaphase, telophase) and significance

•       Meiosis: overview, stages, and significance in sexual reproduction

•       Comparison of mitosis and meiosis

Unit 3: Plant Physiology

This unit covers the vital physiological processes that take place in plants, from nutrition and respiration to growth and reproduction. Understanding plant physiology is central to understanding ecosystems and food production.

Nutrition in Plants

•       Autotrophic nutrition: photosynthesis (light and dark reactions, role of chlorophyll)

•       Factors affecting photosynthesis: light intensity, CO2 concentration, temperature, water

•       Mineral nutrition: macro-nutrients and micro-nutrients, role of nitrogen, phosphorus, potassium

•       Heterotrophic nutrition in plants: insectivorous plants (Pitcher plant, Venus flytrap)

Respiration in Plants

•       Aerobic and anaerobic respiration in plants

•       Glycolysis, Krebs cycle, and electron transport chain: overview

•       Significance of cellular respiration and the release of ATP

Plant Transport

•       Water and mineral absorption by roots: root hair structure, osmosis, and active uptake

•       Transport of water and minerals: structure of xylem, ascent of sap, transpiration pull

•       Transpiration: types (stomatal, cuticular, lenticular), factors affecting transpiration, significance

•       Translocation of food: structure of phloem, pressure flow hypothesis

Growth and Development in Plants

•       Plant growth regulators: auxins, gibberellins, cytokinins, abscisic acid, ethylene and their roles

•       Tropisms: phototropism, geotropism, hydrotropism, thigmotropism

•       Seed germination: conditions required, types of germination (epigeal and hypogeal)

Unit 4: Human Biology

Human biology is the most detailed unit of the Class 9 syllabus. Students study the structure and function of all major human body systems, developing an integrated understanding of how the human body works.

Nutrition and Digestion

•       Components of a balanced diet: carbohydrates, proteins, fats, vitamins, minerals, water, roughage

•       Human digestive system: organs and their functions (mouth, oesophagus, stomach, small intestine, large intestine, liver, pancreas)

•       Digestive enzymes: amylase, pepsin, lipase, trypsin and their substrates and products

•       Absorption of nutrients in the small intestine: role of villi and microvilli

Respiration in Humans

•       Human respiratory system: nose, trachea, bronchi, bronchioles, alveoli, lungs, diaphragm

•       Mechanism of breathing: inspiration and expiration

•       Exchange of gases in the alveoli: role of partial pressure, diffusion

•       Transport of oxygen and carbon dioxide in blood

•       Regulation of breathing: role of medulla oblongata

Circulation

•       Human circulatory system: heart (structure and function), blood vessels (arteries, veins, capillaries)

•       Cardiac cycle: systole and diastole, heart sounds, heart rate

•       Blood: composition (plasma, RBCs, WBCs, platelets) and functions

•       Blood groups: ABO system and Rh factor

•       Lymphatic system: lymph, lymph nodes, and their functions

Excretion

•       Human excretory system: kidneys (structure: cortex, medulla, pelvis), ureters, urinary bladder, urethra

•       Nephron: structure and function; process of urine formation (filtration, reabsorption, secretion)

•       Osmoregulation: role of ADH in water reabsorption

•       Other organs of excretion: skin (sweat), lungs (CO2 and water vapour), liver (bile pigments)

The Nervous System

•       Organisation of the nervous system: CNS (brain and spinal cord) and PNS (somatic and autonomic)

•       Neuron: structure (dendrites, cell body, axon, myelin sheath, synapse) and function

•       Transmission of nerve impulse: resting potential, action potential, synaptic transmission

•       Reflex arc and reflex action

•       Human brain: cerebrum, cerebellum, medulla oblongata and their functions

The Endocrine System

•       Endocrine glands and their hormones: pituitary, thyroid, parathyroid, adrenal, pancreas, gonads

•       Functions of major hormones: GH, TSH, FSH, LH, ADH, adrenaline, insulin, glucagon, testosterone, oestrogen

•       Differences between nervous and endocrine coordination

Unit Overview and Marks Weightage Table

Practical Work Syllabus

Practical work is a compulsory component of ICSE Class 9 Biology. Students must conduct experiments, make biological drawings, study specimens and slides, and maintain a well-organised practical record book.

Marking Scheme: ICSE Class 9 Biology

Preparation Tips for ICSE Class 9 Biology

ICSE Biology rewards students who combine careful reading, accurate diagram work, and regular revision of factual content. Class 9 covers a substantial range of topics across all four units, making a structured and disciplined study approach essential.

•       Draw diagrams consistently: Biology at the ICSE level carries significant marks for labelled diagrams. Practise drawing and labelling diagrams of cells, organelles, organ systems, the nephron, the neuron, and the heart until they are neat and accurate.

•       Use tables to revise comparisons: Many Biology questions ask students to compare two concepts (e.g., mitosis vs. meiosis, arteries vs. veins, aerobic vs. anaerobic respiration). Create comparison tables for all such topic pairs.

•       Understand processes, not just names: For topics like photosynthesis, digestion, and urine formation, understand the step-by-step process rather than just memorising names. Process-based questions carry high marks in ICSE papers.

•       Revise classification with examples: For Unit 1, create a flowchart of the five-kingdom classification with at least two examples per group and their distinguishing features.

•       Take practical work seriously: Practical observations, accurate slide preparation, and well-drawn biological diagrams are assessed in the practical examination. Regular lab sessions build the skills needed for full practical marks.

•       Create a hormones and functions table: For the endocrine system, maintain a table listing each gland, the hormone it produces, its target organ, and its function. This condenses a large topic into a highly reviable format.

Frequently Asked Questions (FAQs)

What are the four main units of ICSE Class 9 Biology?

The ICSE Class 9 Biology syllabus is organised into four units: Unit 1 (Diversity of Life), Unit 2 (The Cell: The Unit of Life), Unit 3 (Plant Physiology), and Unit 4 (Human Biology). Human Biology is the largest and most detailed unit, covering multiple organ systems.

How many marks does practical work carry in ICSE Class 9 Biology?

Practical work carries 20 marks and project work carries 10 marks in the 100-mark assessment for ICSE Class 9 Biology. Together, the practical and project components account for 30 marks, making them a critical part of the overall assessment.

Is diagram drawing important in ICSE Biology?

Yes, diagram drawing is extremely important in ICSE Biology. Labelled diagrams are awarded separate marks in the theory examination and are compulsory in the practical examination. Students should regularly practise drawing and labelling the key diagrams prescribed in the syllabus.

Which is the most important unit in ICSE Class 9 Biology?

Unit 4 (Human Biology) carries the highest marks of approximately 26 marks in the 70-mark theory paper and is also the most detailed unit. However, all four units are important as questions appear from every unit in the examination. Cell biology and plant physiology are also heavily tested.

Which textbook is recommended for ICSE Class 9 Biology?

Selina Publishers' Concise Biology for Class 9 is the most widely used and recommended textbook in ISC-affiliated schools. It is written in strict alignment with the CISCE syllabus and includes detailed diagrams, exercises, and practical guidance.