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Our Environment

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

Our Environment

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

Our Environment

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

Our Environment

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

Our Environment

Explain the role of  decomposers in the environment?

Our Environment

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

Our Environment

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

Our Environment

Why are crop fields known as artificial ecosystems?

Our Environment

What are the advantages of cloth bags over plastic bags during shopping?

Our Environment

Write the common food chain of a pond ecosystem.