CBSE Notes Of Life Processes Class 10 Pdf PDF – NCERT 2026 -27

These comprehensive notes of life processes class 10 pdf provide chapter-wise explanations aligned with the CBSE syllabus 2026-27, helping students master essential biological concepts for board examination success.

Life Processes is one of the most significant chapters in CBSE Class 10 Science, forming the foundation of biology concepts that students will encounter in higher classes. This chapter explains how living organisms maintain themselves through various physiological activities that distinguish them from non-living matter. Understanding these processes is crucial not only for scoring well in board examinations but also for building a strong conceptual base for competitive examinations like NEET and KVPY.

The notes of life processes class 10 pdf available on NCERTBooks.net cover all essential topics as prescribed by NCERT and CBSE guidelines. Whether you are preparing for your first unit test or final board examination, these notes provide structured content that simplifies complex biological mechanisms into easy-to-understand explanations. For additional chapter resources, you can also access the complete CBSE Life Processes Class 10 Pdf for detailed textbook content.

Understanding Life Processes: Complete Chapter Overview

Life processes refer to the basic functions performed by living organisms to maintain their existence. According to NCERT Class 10 Science Chapter 6, the maintenance functions of living organisms must continue even when they are not actively engaged in activities like movement or growth. These life processes include nutrition, respiration, circulation, and excretion—each playing a vital role in sustaining life.

The chapter begins by explaining what constitutes life and how we identify living organisms. While visible movements like walking or breathing indicate life in animals, plants show much subtler signs. The molecular movements within cells, breakdown of food molecules, and repair of damaged tissues are all life processes occurring continuously within every living organism.

Students often confuse life processes with life activities. While activities like walking, talking, or playing are voluntary actions, life processes are involuntary and continuous. Your heart beats, lungs breathe, and kidneys filter blood even while you sleep. The notes of life processes class 10 pdf clearly differentiate between these concepts with relevant examples from both plant and animal kingdoms.

Nutrition: Autotrophic and Heterotrophic Modes Explained

Nutrition is the process of taking in food and utilising it to obtain energy for growth, repair, and maintenance of body functions. The CBSE Class 10 syllabus 2026-27 emphasises understanding both autotrophic nutrition (self-feeding) and heterotrophic nutrition (dependent feeding) with detailed examples.

Autotrophic organisms, primarily green plants and certain bacteria, synthesise their own food using simple inorganic substances. This process, called photosynthesis, occurs in chloroplasts where chlorophyll captures sunlight energy. The equation students must memorise is:

Heterotrophic nutrition is further classified into holozoic (ingestion of solid food), saprophytic (absorption of dead organic matter), and parasitic (obtaining nutrients from living hosts) nutrition. Students preparing with notes of life processes class 10 pdf should focus on understanding human digestive system as the primary example of holozoic nutrition.

The human digestive system consists of the alimentary canal and associated digestive glands. Food undergoes mechanical digestion (chewing, churning) and chemical digestion (enzymatic breakdown) as it passes through different organs. Key enzymes and their functions are summarised in the tables below, which are crucial for examination preparation.

Understanding enzyme specificity is essential—each enzyme acts on specific substrates under optimal pH conditions. Salivary amylase works in slightly alkaline conditions of the mouth, while pepsin requires highly acidic environment of the stomach. This concept frequently appears in reasoning-based questions where students must explain why protein digestion cannot occur in the mouth.

Respiration: Understanding Aerobic and Anaerobic Pathways

Respiration is the process of breaking down glucose molecules to release energy stored in chemical bonds. The notes of life processes class 10 pdf explain both cellular respiration (occurring in mitochondria) and breathing (exchange of gases in lungs) as interconnected processes essential for energy production.

Aerobic respiration occurs in presence of oxygen and is the primary energy-producing pathway in most organisms. The complete breakdown of one glucose molecule yields 38 ATP molecules, making it significantly more efficient than anaerobic alternatives. The equation representing aerobic respiration is:

Anaerobic respiration becomes important when oxygen supply is insufficient. In human muscles during vigorous exercise, glucose breaks down to lactic acid, causing muscle fatigue and cramps. In yeast cells, anaerobic respiration produces ethanol and carbon dioxide—a process commercially utilised in bread making and alcohol production.

The human respiratory system facilitates gas exchange between blood and atmosphere. Air enters through nostrils, passes through pharynx, larynx, and trachea before reaching bronchi and finally the alveoli—tiny air sacs where actual exchange occurs. The large surface area of alveoli (approximately 100 square metres when combined) ensures efficient diffusion of oxygen and carbon dioxide. Students exploring related concepts may find ICSE Class 12 Biology Concept Notes helpful for advanced understanding.

Transportation in Plants and Animals: Circulatory System Notes

Transportation refers to the movement of materials within the organism’s body. In complex multicellular organisms, specialised systems have evolved to transport nutrients, gases, hormones, and waste products efficiently. The notes of life processes class 10 pdf cover both plant transport systems (xylem and phloem) and the human circulatory system in detail.

In plants, water and dissolved minerals move upward through xylem tissue by transpiration pull and root pressure. The process called ascent of sap depends on cohesion-adhesion forces and transpiration from leaf surfaces creating negative pressure that pulls water upward. Phloem tissue transports synthesised food (mainly sucrose) from leaves to other plant parts through translocation.

The human circulatory system consists of the heart, blood vessels, and blood. The human heart is a four-chambered muscular organ that pumps blood continuously throughout life. Understanding the pathway of blood through heart chambers is essential for examination success. Students often struggle to build foundational biology knowledge, so reviewing CBSE Class 9 – Chapter-wise Summary can strengthen prerequisite concepts.

Blood circulation in humans follows a double circulation pattern—blood passes through the heart twice in one complete circuit. Pulmonary circulation carries deoxygenated blood from right ventricle to lungs for oxygenation, while systemic circulation delivers oxygenated blood from left ventricle to all body tissues. This separation ensures efficient oxygen delivery to tissues.

Blood components include plasma (liquid matrix), red blood cells (oxygen transport), white blood cells (immunity), and platelets (clotting). Each component has specific functions that students must understand for both objective and subjective questions. The notes of life processes class 10 pdf provide comparative tables summarising these differences clearly.

Excretion: Human Excretory System and Nephron Structure

Excretion is the biological process of removing metabolic waste products from the body. While carbon dioxide (from respiration) is excreted through lungs, nitrogenous wastes like urea are removed through the excretory system. The notes of life processes class 10 pdf explain the structure and function of human kidneys as the primary excretory organs.

Each kidney contains approximately one million functional units called nephrons. The nephron structure includes Bowman’s capsule, glomerulus, proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct. Understanding how each part contributes to urine formation is essential for scoring well in CBSE examinations.

Plants also excrete waste products, though their mechanisms differ from animals. Excess water is removed through transpiration, carbon dioxide exits through stomata, and many waste products are stored in vacuoles, bark, or fallen leaves. Some plants deposit wastes as resins and gums, which have commercial applications.

Artificial kidney or dialysis machine is an important application