Q2 of 25 Page 293

Define ecosystem.

Ecosystem is a part of environment, where the biotic components are present and interacting with their physical surroundings. It is the structural and functional unit of environment.


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The most important compound which accounts for almost 80% for the total depletion of ozone layer is:

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What is an environment?

 2

Define food chain and food web.

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Give examples of solid waste.