Our environment Worksheet-10

Our environment Worksheet-10


  1. What is the physical environment of an ecosystem called?


  1. What is the functional unit of the environment, comprising the living and non-living components called?


  1. Which part of solar radiation is absorbed by ozone layer?


  1. Give an example of man-made ecosystem.


  1. Which organism can make organic compounds from inorganic substances using radiant energy of the sun?


  1. What is the advantage of a disposable paper cup over a plastic cup?


  1. What is biological magnification?


  1. Name one chemical compound which depletes ozone layer.


  1. Which of the following are non-biodegradable:

(a) Animal bones, silver foil, plastic mugs, leather belt.

(b) Glass bottle, paper, aluminium foil, DDT.

(c) Paper, aluminium, polythene bags, animal bones.


  1. Which of the following are biodegradable:

(a) Animal bones, iron nails, plastic mugs, leather belt.

(b) Aluminium wire, tea leaves, synthetic fibre, wool.

(c) Glass bottle, paper, aluminium foil, DDT.

(d) Leather belt, aluminium foil, animal bones, polythene bags.

(e) Paper, aluminium foil, polythene bags, animal bones.

(f) Aluminium foil, paper, all point pen refill, hay.


  1. What is the importance of the ozone layer?


  1. Which layer is found above ozone layer of the atmosphere? Mention one characteristic feature of this layer.


  1. Which of the following groups contains only biodegradable items?

(a) Grass, flowers and leather.     (b) Grass, wood and plastic.

(c) Fruit-peels, cake and lime-juice. (d) Cake, wood and grass.



  1. Abiotic environment.


  1. Ecosystem.


  1. Ultraviolet radiation.


  1. Aquarium.


  1. All green plants and certain blue-green algae.


  1. The use of disposal paper-cups aids in a step forward for hygienic reasons.


  1. Biological magnification refers to the process of increase in the concentration of a toxic chemical with increasing trophic level in a food chain.


  1. Chlorofluorocarbon.


  1. (a) Silver foil and plastic mugs.

(b) Glass bottle, DDT and aluminium foil,

(c) Aluminium and polythene bags.


  1. (a) Animal bones and leather belt.

(b) Tea leaves and wool.

(c) Paper.

(d) Leather belt and animal bones.

(e) Paper and animal bones.

(f) Paper and hay.


  1. Ozone layer absorbs the ultra-violet rays coming from the sun and protects the living things on earth from their harmful effects.


  1. Ionized layer. It reflects radio waves.


  1. Group :

(a) Grass, flowers and leather,

(c) Fruit-peels, cake and lime-juice

(d) Cake, wood and grass