CBSE Class 10 Science Notes Chapter 15: The surroundings include both living and nonliving things that exist together naturally. It involves a dynamic interaction of weather elements, living beings, and natural resources. All these factors directly affect human survival and economic activities. The document provides information about ecosystems, their components, trophic levels in a food chain, and the ozone layer. 2. The main components of an ecosystem are biotic factors like plants and animals, and abiotic factors like air, water, and land. Producers, consumers, and decomposers all interact within an ecosystem. 3. Get Notes , NCERT Questions, Extra Questions (with answers) of Chapter 15 Class 10 Science - Our Environment . We at Teachoo have solved the NCERT Back Questions, as well as the questions from inside the chapter and provided Revision Notes as well. Our Environment class 10 Notes Science chapter 15 in PDF format for free download. Latest chapter wise notes for CBSE board exams.