What is meant by biodegradable waste materials? Give two examples of biodegradable wastes.

Give two differences between food chain and food web.

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

Which of the following materials are non-biodegradable?

Aluminum wire, Tea leaves, Synthetic fibre, wool

What is meant by non-biodegradable waste materials ? Give two examples of non-biodegradable wastes.