Living organisms can never live in isolation.they live in a particular natural environment where they interact with certain living organisms and maintain a delicate balance to suit their life cycle.this kind of a balanced and life supporting environment is called an ecosystem.
the chain of supply of food from the basic producer to the consumer is called the food chain.
eg: sun----->trees and grasses----->deer and other consumers----->tiger.
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An ecosystem is a self-contained area composed pf all the different organism living in it,interacting with each other,as well as interacting with the physical conditions i.e.sunlight ,air,water,soil,climatic factors,etc prevailing in the area. eg-Green plant-Grasshopper-Frog-Snake-Eagle