Q7 of 38 Page 109

Explain the role of decomposers in the environment?

Decomposers plays an important role in environment as they are responsible for decomposing the dead remnants of dead plants and animals and helps in clearing the dead remains from environment. Since the dead plants are decomposed by decomposers, so they can be used as raw material and can channelize back to the nature results in maintaining the cycle in ecosystem.


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5

Differentiate between biodegradable and non-biodegradable substances. Cite examples.

 6

Suggest one word for each of the following statements/ definitions

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


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


(c) The physical factors like temperature, rainfall, wind and soil of an ecosystem


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

 8

Select the mis-matched pair in the following and correct it.

A. Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain


B. Ecosystem — Biotic components of environment


C. Aquarium — A man-made ecosystem


D. Parasites — Organisms which obtain food from other living organisms

 9

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