1.

What is an ecosystem ? List its two main components. We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.

Answer»

Ecosystem is the structural and functional unit of biosphere, comprising of all the interacting organisms in an area together with the non-living constituents of the environment.

Two main components of Ecosystem are :

(i) Biotic component

(ii) Abiotic component

An aquarium is an artificial and incomplete ecosystem compared to pond or lakes which are natural, self-sustaining and complete ecosystem where there is a perfect recycling of materials.

We need to clean of aquarium because of the :

(i) absence of natural decomposer.

(ii) stagnancy of water.



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