Class 11 Biology Chapter 1 Notes: The Living World – Short & Easy
Class 11 Biology Chapter 1: The Living World – Short Notes 1. What is the Living World? The living world includes all living organisms present on Earth such as plants, animals, microorganisms, fungi, and humans. Living organisms show common characteristics like growth, metabolism, reproduction, and response to stimuli. 2. Characteristics of Living Organisms Living organisms can be identified by the following features: Growth – Increase in size and mass due to cell division. Reproduction – Ability to produce new individuals of the same species. Metabolism – Sum total of all chemical reactions occurring in the body. Respiration – Process of releasing energy from food. Response to Stimuli – Ability to respond to environmental changes. 3. Diversity in the Living World There is a huge variety of living organisms on Earth. They differ in size, shape, habitat, nutrition, and life span. To study them easily, scientists classify organisms into groups. 4. Need for Classification Classificat...