Forum

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.

Our Environment

Why is improper disposal of waste a curse to environment?

Our Environment

Disposable plastic plates should not be used because
(a) they are made of materials with light weight
(b) they are made of toxic materials
(c) they are made of biodegradable materials
(d) they are made of non-biodegradable materials

Our Environment

If a grass hopper is eaten by a frog, then the energy transfer will be from
(a) producer to decomposer
(b) producer to primary consumer
(c) primary consumer to secondary consumer
(d) secondary consumer to primary consumer