Q9 of 38 Page 109

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

A pond or lake is not required to be cleaned because they have their own natural system to clean them but aquarium is a man-made ecosystem and consists of a very small area or space. Moreover, the abiotic components are supplied by human and are not naturally. So. For survival of living bodies in the aquarium, it is necessary that it should be cleaned regularly.


More from this chapter

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7

Explain the role of decomposers in the environment?

 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

 1

Indicate the flow of energy in an ecosystem. Why is it unidirectional? Justify.

 2

What are decomposers? What will be the consequence of their absence in an ecosystem?