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Our Environment


     Environment is defined as the surroundings in which the organism lives. The environment may be the physical environment, the chemical environment or the biological environment.

How Does Waste Affect the Environment?

     Accumulation of wastes due to its improper disposal is a major problem in our country. Population in India has been growing at a rapid rate.

Classification of Wastes

     The wastes include kitchen waste, papers, construction materials, old tyres, medical wastes, etc.

Components of the Ecosystem

     The environment in which the man and other organisms live is called the biosphere. The biosphere is made up of different regions that have different types of flora (plants) and fauna (animals).

Food Chain

     A food chain is a series of steps by which energy is obtained, used, and transformed by living things.

Trophic Levels

     Each link in a food chain is known as a trophic level. For example, in each food chain, plants always form the first trophic level.

Significance of Food Chains and Ecosystems

     The study of food chains helps in understanding some of the important aspects of the ecosystem in particular and environment in general.

Energy Flow in Biosphere

     All living beings require a constant supply of energy for the various functions they perform. The energy is obtained from the sun.

Impact of Man's Activities on Environment

     The addition of certain pollutants like the carbon dioxide gases increases the temperature of the earth. These gases remain close to the surface of earth, forming an insulating layer.

Waste Management

     Environmental problems like depletion of the ozone layer and waste disposal are issues that have to be dealt with serious concern.


     Environment is defined as the surroundings in which the organism lives. It has two components - abiotic and biotic.

Question and Answers

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Multiple Choice Questions


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