Everyone is familiar with one’s own surrounding. It plays an important role in the survival of all organisms. The sum of physical and biological factors along with their chemical interactions that affect an organism is called environment. The living organisms always try to maintain a balance among them selves and with biotic and abiotic factors. All components of biosphere interact in an organized manner with the organisms. This interaction assures an organism to survive that may result in gradual evolution of the organisms in the biosphere. The physical factors refer to abiotic factors (land, air, water sun light etc) and biological factors to biotic factors (flora and fauna). The place where an organisms lives is called habitat. An organism can’t completely defy the balance to suit one’s need. It would in some way or the other affect the balance in such a way that the survival of the organism affecting the damage would be at stake.

You have understood the relationships between organisms and their food in earlier classes with the help of food chains and food webs. Food chains are interconnected and when we try to observe these connections among a number of food chains then it becomes a food web. As you know a food chain shows who eats what in a particular habitat. The arrows between two organisms in the chain always point from the food to the feeder.

If we want to show a food chain consisting of grass, snake, rabbit and hawk then connect the given