Q38 of 163 Page 226

What will be the consequence of the absence of decomposers in the ecosystem?

If decomposers get absent from the ecosystem then the dead remains of plants and animals will not be decomposed, as a result the dead matter would pile up and the nutrients will not be returned back to the plants through soil.


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36

Write a common food chain of a pond ecosystem having four links.

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We do not clean ponds or lakes but an aquarium needs to be cleaned periodically. Why?

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Give two differences between food chain and food web.

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Write one or two words for each of the following statements/definitions:

(a) Each level of food chain where transfer of energy takes place


(b) The physical factors like temperature, rainfall, light, soil, air and water of an ecosystem


(c) Organisms which depend on the producers for food either directly or indirectly


(d) The physical and biological world where we live in


(e) Self-contained unit of living things and their non-living environment needing only sunlight for its functioning