OUR ENVIRONMENT 10

PRACTICE PAPER 

SUB : BIOLOGY (2020)

CLASS X                                      OUR ENVIRONMENT                                                   
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I.Very short answer type questions: 

1. Why should biodegradable and non-biodegradable waste be discarded in two separate dustbins ?
2. Why is improper disposal of waste a curse to the environment?
3. What are the advantages of cloth bags over plastic bags during shopping?
4. Mention one negative effect of our affluent lifestyle on the environment.
5. Write the common food chain of a pond ecosystem.
6. Which chemical is used in a fire extinguisher? How it is harmful?
7. Why are crop fields known as an artificial ecosystem?
8. State a way to prevent the accumulation of harmful chemicals in our bodies.
9. List two non-biodegradable waste generated daily in the kitchen which can be recycled.
10. Consider a food chain consists of Wheat, Rat, Snakes, and Peacock. What will happen if all the snakes are killed?
11. Choose one consumer each that belongs to the second and third trophic levels from the organisms. Eagle, Frog, Tiger, Rabbit, Fox
12. Pesticides added to a field are seen in an increased amount in the crop and in the bird that feeds on them. What is this phenomenon called?
13. What happens during the first step of ozone formation in the atmosphere?
14. List two main components of our environment. Why are green plants called producers?
15. Define ecosystem. Name the chemical compound which depletes the Ozone Layer.
16. Name the organisms belonging to 4th trophic levels in the food chain comprising of snakes, insects, frogs, plants, and hawks.
17. Name the two abiotic components of the ecosystem.
18. Mention the role of microorganisms like bacteria and fungi.
19. In the following food, chain grass provides 4000 J of energy to the grasshopper. How much energy will be available to Snakes and frog?  
20. State any two possible consequences of the elimination of decomposers from the earth.
21. Write any four examples of abiotic factors.
22. If autotrophs occupy the first trophic level are called producers then what are herbivores called?
23. What are biotic factors?
24. What is the full form of UNEP and CFCs?

II. Short answer type questions : 

1. In some states of our country, there is a ban on the use of Polythene bags for shopping. Why? List three advantages of using jute or cloth bags over Polythene bags.
2. Differentiate between food chain and food web.
3. Differentiate between household wastes and industrial waste.
4. In a food chain comprising Tiger, Plants, and Goat, which will transfer the maximum amount of energy and receive a minimum amount of energy.
5. What is the by-product of fertilizer industries? How do they affect the environment?
6. Why is the Government of India imposing a ban on the use of Polythene bags? Suggests an alternative to these bags and explain how this man is likely to improve the environment.
7. Explain some harmful effects of agricultural practices on the environment.
8. List two environment-friendly practice or habits which need to be followed by every member of the family community. Explain how this practice will support a safe environment mission.
9. Traditional use of forest areas is not useful in maintaining biodiversity. Do you agree with this statement? Explain with the help of an example.
10. What are the top carnivores? Give two examples.
11. Write any four effects of ozone depletion on our health.
12. In the food chain, grass → deer → lion operating in a forest, what will happen if (i) all the lions and (ii) deers are removed?
13. Why are only four or five trophic levels present in each food chain?
14. Industrialization is one of the main causes of depletion of the environment. List any four reasons in favour of this statement.
15. Why do enzymes which breakdown carbohydrates in food do not break down coal?
16. Discuss the feeding pattern in a food web.
17. What is ozone? How does it protect the organisms on earth?
18. Observe the food chain. A plant (1000 kj), Goat, Lion. How much energy does the Lion get in the above food chain?
19. What is the ecosystem? List two main components.
20. Phytoplankton ➝Small fish ➝ Large fish ➝ man. DDt has entered the food chain and caused serious damage to human health. Provide a solution to this problem. 
21. Give any two examples of each:
    (a) Organisms occupying the first trophic level.
    (b) Carnivores.
    (c) Biodegradable waste of humans.
    (d) Ecosystems.
    (e) Abiotic factors of an ecosystem.
22. It is said there is a need to put a blanket ban on the products containing aerosols. What are aerosols? Why is there a demand to put a ban on them?
23. Consider a food chain of the following fish, crab, and plankton shark. Arrange the above chain in the proper order of the trophic level. Mention the role of decomposers in our ecosystem.
24. Mention any three significances of a food chain.

III.Long answer type questions: 

1. What is meant by the food chain? The number of trophic levels in a food chain is limited. Give reasons to justify this statement.
2. We do not clean Ponds on lakes, but an aquarium needs to be cleaned regularly. Explain.
3. Our food grain such as wheat and rice, the vegetables and fruits and even meet are found to contain varying amounts of pesticide residue. State the reasons to explain how and why it happens?
4. What are decomposers? List two important roles they play in the environment. List two reasons to show that the existence of decomposers is essential in an ecosystem.
5. The maximum concentration of harmful chemicals accumulates in human beings. State the phenomenon involved and justify this statement.
6. Give any two ways in which biodegradable substances would affect the environment.
7. Give reasons: 
   (a) kulhads have been a band for serving tea or platform.
   (b) Decomposers are not included in any food chain.
8. Why produces are transducers energy?
9. Explain the role of UV radiation information of ozone with the help of a chemical reaction. Name the pollutant and write its role in the depletion of the Ozone layer.
10. What are biotic factors ? Give any two examples.
11. What are the problems caused by the non-biodegradable wastes that we generate?
12. What are consumers? Name the four categories into which the consumers are farther grouped.
13. Explain the phenomenon of Biological magnification. How does it affect organisms belonging to different trophic level particularly the territory consumer?
14. Damage to the Ozone layer is a cause for concern. Justify this statement. Suggest any two steps to limit this damage.
15. Why is only 10% of energy made available to the next trophic level when green plants are eaten by herbivores?
16. What is ozone? Show the reactions of the formation of ozone from oxygen in the atmosphere.
17. When did the amount of ozone in the atmosphere beings to draw sharply? Why did this happen? How was this problem taken care of by UNEP?
18. Explain why the use of plastic bags is banned in many places? What could be a more environment-friendly alternative?
19. What are tropic levels? Give an example of a food chain and state the different trophic levels in it.
20. Calculate the amount of energy is available to Lion in the following food chain if plants have 20000 joules of energy available from the sun.                 Plant ➝Dear➝Lion.
21. Why there is a progressive decline in the amount of energy at each trophic level?
22. On what basis are organisms grouped as producers consumers and decomposers. Write two problems that would arise if there were no decomposers in an ecosystem.
23. Define the following:
    (a) Food chain (b) Trophic level
    (c) Producers (d) Parasites 
    (e) Non-biodegradable substances.
24. Name the following:
    (a) Organisms feeding on animal and plant food.
    (b) Organisms breaking down the waste of living beings.
    (c) The organisms occupying the first trophic level of any food chain.
    (d) A complex network of much-interconnected food chains and feeding relationships.
    (c) The cumulative increases in the concentrations of the persistent substances in successively higher levels of the food chain.
25. It is said there is a need to put a blanket ban on the products containing aerosols. What are aerosols? Why is there a demand to put a ban on them?
26. Give any two examples of each:
    (a) Organisms occupying the first trophic level.
    (b) Carnivores.
    (c) Biodegradable waste of humans.
    (d) Ecosystems.
    (e)Abiotic factors of an ecosystem.
27. Consider a food chain of the following fish, crab, and plankton shark. Arrange the above chain in the proper order of the trophic level. Mention the role of decomposers in our ecosystem.
28. We often observe domestic waste decomposing in the by-lanes of residential colonies. Suggest ways to make people realize that improper disposal of waste is harmful to the environment.
29. Energy flow in a food chain is directional. Justify this statement.
30. Explain how the pesticides enter a food chain and subsequently get into our body.

Chapter 1 - Chemical Reactions and  Equations	Quick View	Questions with Solutions
Chapter 2 - Acid, Bases and Salt	Quick View	Questions with Solutions
Chapter 3 - Metal and Non-metals	Quick View	Questions with Solutions
Chapter 4 - Carbon and it's compound	Quick View	Questions with Solutions
Chapter 5 - Periodic Classification of Elements	Quick View	Questions with Solutions
Chapter 6 - Life Processes	Quick View	Questions with Solutions
Chapter 7 - Control and Co-ordination	Quick View	Questions with Solutions
Chapter 8 - How do Organisms Reproduce?	Quick View	Questions with Solutions
Chapter 9 -  Health and Heredity	Quick View
Chapter 10 -  Reflection and Refraction	Quick View	Questions with Solutions
Chapter 11 -  Human Eye Colourful World	Quick View	Questions with Solutions
Chapter 12 -  Electricity	Quick View	Questions with Solutions
Chapter 13 -  Magnetic Effect of Electric Current	Quick View	Questions with Solutions
Chapter 14 -  Sources of Energy	Quick View	Questions with Solutions
Chapter 15  - Our Environment	Quick View
Chapter 16 - Management of  Natural  Resources	Quick View