Our environment Worksheet-5

Our environment Worksheet-5

1. What is meant by the term 'Environment'?

2. Name any two non-biodegradable wastes.

3. Name any two biodegradable substances.

4. Which of the following are biodegradable?

(a) Wool, glass, silver foil, leather.

(b) Leather shoe, Earthen pot, Silver spoon, Jute bag.

(c) Tomato leaves, Aluminium wire, Synthetic fibre, Wool.

5. Which of the following belonging to a food chain is likely to have maximum concentration of harmful chemicals in its body?

(a) Kingfisher, Zooplankton, Fish, Phytoplankton

(b) Peacock, Frog, Snake, Grasshopper.

(c) Frog, Hawk, Grasshopper, Snake.

(d) Small fish, Zooplankton, Birds, Phytoplankton.

6. Which two of the following belong to the same trophic level?

(a) Grasshopper, Frog, Grass, Lizard.

(b) Goat, Grass, Crow, Squirrel.

7. Rearrange the following according to their ascending trophic levels in a food chain:

Hawk, Grass, Snake, Rabbit.

8. If a harmful chemical enters a food chain comprising fishes, phytoplanktons and birds, which of the organisms is likely to have minimum concentration of the harmful chemicals in its body?

9. In the following food chain 20 J of energy was available to the hawks. How much would have been present in the plants?

Plants → Rats → Snakes → Hawks

10. In a food chain comprising lion, grass and deer, which will

(i) transfer the maximum amount of energy?

(ii) receive minimum amount of energy?

11. If a harmful chemical enters a food chain comprising snakes, peacock, mice and plants. Which of these organisms is likely to have the maximum concentration of this chemical in its body?

12. Rearrange the following according to their trophic levels in a food chain:

Fish, Zooplankton, Seal, Phytoplankton

13. Give the technical terms for the graphical representation of the trophic structures in a food chain.

14. Name any two carnivores.

15. Name any two omnivores.

16. Name the group of chemical compounds which adversely affects the ozone layer.

17. Which of the following materials are non-biodegradable?

(a) Paper, leather, nylon, eggshell, glass.

(b) Tea leaves, glass, glucose, cotton cloth, silver foil.

(c) Glass, glucose, leather, silver foil, nylon cloth.

18. Which two of the following materials are biodegradable?

(a) Glass, glucose, leather, silver foil, nylon cloth.

(b) Detergents, coconuts, leather, polythene, glass.

19. Which two of the following are non- biodegradable?

(a) Detergent, coconut, leather, cotton fabric, glass.

(b) Eggshell, butter, detergents, leather, silver foil.

20. Consider the food chain : Grass → Goat → Tiger

If tiger has 30 J of energy available in this food chain, how much energy was originally available in grass?

Answer:

1. Environment is the sum total of all external conditions and influences that affect the life and development of an organism, i.e., the environment includes all the physical or abiotic and biological or biotic factors.

    

2. DDT and polythene bags.

3. Cloth and paper.

4. (a) Wool, leather

(b) Leather shoe, Earthen pot and Jute bag

(c) Tomato leaves, Wool.

5. (a) Kingfisher, (b) Peacock, (c) Hawk, (d) Birds.

6. (a) Frog and Lizard, (b) Goat and squirrel.

7. Grass → Rabbit → Snake → Hawk.

8. Phytoplanktons.

9. Plants      →      Rats   →   Snake    →      Hawks.

20,000 J      2000 J         200 J           20 J (Given)

As per 10% law of flow of energy, plants would have 20,000 J of energy.

10. (i) Grass, (ii) Lion.

11. Peacock

12. Phytoplankton → Zooplankton → Fish → Seal.

13. Trophic levels.

14. Tiger and Leopard.

15. Cockroach and crow.

16. CFC (Chlorofluorocarbon).

17. (a) Nylon and glass

(b) Glass and silver foil

(c) Glass, silver foil, nylon cloth.

18. (a) Glucose and Leather (b) Coconut and leather.

19. (a) Detergent and glass.

(b) Detergents and silver foil.

20. 300 J.