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Q 1. Products which can be broken down by action of bacteria or other saprophytes are
Non-biodegradable
Biodegradable
Both
None of these
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Q 2. Biotic and abiotic components together consist
Ecology
Ecosystem
Environment
None of these
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Q 3. Garden and crop fields are examples of
Natural ecosystem
Artificial ecosystem
Food web
Food chain
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Q 4. Each step or level of the food chain forms
trophic level
top level
bottom level
none of these
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Q 5. What shields the surface of the earth from ultraviolet(UV) radiation?
Ozone layer
Lithosphere
Water layer
Atmosphere
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Q 6. Ultraviolet radiation can cause
Diabeties
Blood cancer
Skin cancer
Cough and cold
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Q 7. Plants and Animals are
Biotic components
Abiotic components
Both (A) and (B)
None of these
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Q 8. Each step or level of the food chain forms a trophic level. The autotrophs comes at which trophic level
First
Second
Third
Fourth
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Q 9. Is their is some loss of energy in environment occurs when energy is transferred from autotrophs to heterotrophs.
Yes, 90% energy is lost
10% energy is lost
Energy is gained
None of these
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Q 10. With how many atoms of oxygen one molecule of ozone is formed
Two
Three
Four
Eight
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Q 11. Ozone shields the surface of earth from
Gamma radiations
Infrared Radiation
Ultra-violet radiations
Nuclear radiations
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Q 12. Detergent is the examples of substances that are
Biodegradable
Non-biodegradable
Ecofriendly
Both (A) & (B)
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Q 13. The substances which can be easily degraded by bacteria or other sparophytes are
Biodegradable
Non-ecofriendly
Non-biodegradable
None of these
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Q 14. Garden and crop-field are example of
Artificial ecosystem
Natural ecosystem
Aquatic ecosystem
None of these
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Q 15. Organisms which can prepare their own food are
Consumers
Producers
Parasites
None of these
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Q 16. By which process producers like plants and blue green algae produce their food
Photosynthesis
Digestion
Both (A) & (B)
None of these
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Q 17. Which of the following comes under consumers?
Herbivores
Carnivores
Parasite
All of these
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Q 18. The microorganisms that break down the complex organic substance into simple inorganic substance that go into the soil and are used up once more by plants are
Consumers
Producers
Decomposers
None of these
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Q 19. What percent can be taken as an average value for the amount of energy that reaches the next level of consumers.
30%
20%
10%
50%
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Q 20. Each organism is generally eaten by several other organism. So instead of a straight line food chain, the relationship can be shown as a series of branching lines called
World web
Consumers web
Food web
Decomposers web
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Q 21. Which of the following constitute a food-chain?
Grass, wheat and mango
Grass, deer and Lion
Goat, cow and elephant
Grass, fish and goat
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Q 22. The decrease of ozone in the atmosphere has been linked to synthetic chemical which is used as refrigerants and in fire extinguishers. This chemical is
Chlorofluorocarbons
Carbon monoxide
Carbon dioxide
None of these
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Q 23. In 1987, which programme succeeded in forging an agreement to freeze CFC production at 1986 level.
UNEP
UNGP
AEP
None of these
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Q 24. Which of the following are environment friendly practices?
Carrying cloth bags to put purchases in while shopping
Switching off unnecessary lights and fans
Walking to school instead of getting your mother to drop you on her scooter
All of the above
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Q 25. In food chain 
Percent of energies transfer will be respectively
1, 10, 10
90, 10, 10
1, 1, 1
1, 10, 0