Our Environment

Our Environment

Very Short answer type Questions 1. Name any two man-made ecosystems. Answer : Agricultural/crop fields, aquaria,...

SHORT ANSWER TYPE QUESTIONS (SAQ)

1. State with reason any two possible consequences of elimination of decomposers from the earth. Answer : Consequ...

2. What does a trophic level represent in a food chain? State the position of autotrophs and herbivores in a food chain....

3. Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem. Answer : Ecosystem is wh...

4. What is meant by biological magnification? Answer : Biological magnification or biomagnification refers to the...

5. Give an example to illustrate that indiscriminate use of pesticides may result in the degradation of the environment....

6. Answer the following questions about transfer of materials in the ecosystem. (i) Mention two ways by which energy is...

7. What is a food web? Give few characteristics of a food web? Give an example of a food web? Answer : A food web i...

8. What are trophic levels? Give an example of food chain and state the different trophic levels in it? Answer : Th...

9. Give some characteristics of a food chain? Answer : Some characteristics of food chain are : i. A food chain goe...

10. What are the characteristics of energy transfer in biosphere? Answer : The characteristics of energy transfer i...

11. What is meant by the term ‘Biomass? Answer : Biomass is the total amount of living or organic matter in an ec...

12. Bacteria and fungi are called decomposers. Why? Answer : Bacteria and fungi are called decomposers because the...

13. What is biological magnification? Will the levels of this magnification be different at different levels of the ecos...

14. "The maximum concentration of harmful chemicals accumulates in human beings." State the phenomenon involved and just...

15. Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the...

16. What are decomposers? What will be the consequence of their absence in an ecosystem? Answer : Decomposers are t...

17. What is ozone and how does it affect any ecosystem? Answer : Ozone is a molecule made up of three oxygen atoms....

18. Show the reactions of formation of ozone from oxygen in the atmosphere? Name the pollutant and its role in depletion...

19. You have been selected to talk on "Ozone layer and its protection" in the school assembly on Environment Day". (i)...

20. Write the essential functions performed by ozone at the higher levels of the Earth's atmosphere? How is it produced?...

21. Briefly describe different methods of wastes disposal? Answer : The various methods of waste disposal are: 1. L...

22. What are the advantages of paper bags over plastic bags during shopping? Answer : The advantages of paper bags...

23. Give any two examples of each: (i) Organisms occupying the first trophic level. (ii) Carnivores. (iii) Biodegradable...

Answer : (i) Grass, green plants (ii) Tiger, Eagle (iii) Waste from the kitchen such as fruit and vegetable peels,...

24. Suggest any four activities in daily life which are ecofriendly? Answer : The four activities in daily life w...

25. Give any two ways in which biodegradable substances would affect the environment. Answer : The two ways in whic...

26. Why do producers always occupy the first trophic level in every food chain? (Foreign 2016) Answer : Producers a...

27. We often use the word environment. What does it mean? Answer : Environment can be defined as the physical or...

28. The following organisms form a food chain. Which of these will have the highest concentration of non-biodegradable c...

29. What are the problems caused by the non biodegradable wastes that we generate? Answer : The problems caused b...

30. If all the waste we generate is biodegradable, will this have no impact on the environment? Answer : If all th...

LONG ANSWER TYPE QUESTIONS (LAQ)

1. “Industrialisation has adversely deteriorated the environment.” Give four reasons in support of this statement....

2. What is meant by food chain? “The number of trophic levels in a food chain is limited.” Give reason to justify this s...

3. A team of Indian researchers went to Antarctica to study the ozone layer. They confirmed the presence of largest ozon...

4. Name the wastes which are generated in your house daily. What measures would you take for their disposal? Answer...

5. What is an ecosystem? What are the components of an ecosystem? Also discuss the types of ecosystem? Draw a block diag...

6. Answer the following : (i) What is meant by non-biodegradable waste? Identify non-biodegradable wastes from the foll...

7. Answer the following questions : (i) If Sita is consuming curd/yogurt for lunch, which trophic level in a food chain...

8. You have been selected to talk on “Ozone layer and its protection” in the school assembly on ‘Environment Day’. (a) W...

9. After the examinations Rakesh with his friends went on a picnic to a nearby park. All friends carried cooked food pac...

10. (a) Write two harmful effects of using plastic bags on the environment. Suggest alternatives to the usage of plastic...

11. Explain energy relationships with trophic levels? Answer : Each level of the food chain where food or energy is...

12. We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make the residen...

13. (a) What is an ecosystem? (b) List any two natural ecosystems. (c) We do not clean ponds or lakes but an aquarium ne...

NCERT SOLUTION

Page 212 Q1. What are trophic levels? Give an example of a food chain and state the different trophic levels i...

Page 214 Q1. Why are some substances biodegradable and some non-biodegradable? Substances that br...

Page 216 Q1. What is ozone and how does it affect any ecosystem? Ozone (O3) is a gas made of thre...

Pages 216-217 Q1. Which of the following groups contain only biodegradable items? (a) Grass, flow...