Correct Marks 1
Incorrectly Marks 0
Q 1. By which process producers like plants and blue green algae produce their food
Photosynthesis
Digestion
Both (A) & (B)
None of these
Correct Marks 1
Incorrectly Marks 0
Q 2. 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
Correct Marks 1
Incorrectly Marks 0
Q 3. Which of the following constitute a food-chain?
Grass, wheat and mango
Grass, deer and Lion
Goat, cow and elephant
Grass, fish and goat
Correct Marks 1
Incorrectly Marks 0
Q 4. 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
Correct Marks 1
Incorrectly Marks 0
Q 5. 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
Correct Marks 1
Incorrectly Marks 0
Q 6. In food chain 
Percent of energies transfer will be respectively
1, 10, 10
90, 10, 10
1, 1, 1
1, 10, 0
Correct Marks 1
Incorrectly Marks 0
Q 7. The best source of energy is
Water
Soil
Plants
Ponds
Correct Marks 1
Incorrectly Marks 0
Q 8. Ozone depletion can lead to
Skin cancer
Eye cataract
Both A and B
Brain cancer
Correct Marks 1
Incorrectly Marks 0
Q 9. Each step or level of the food chain forms
trophic level
top level
bottom level
none of these
Correct Marks 1
Incorrectly Marks 0
Q 10. Plants and Animals are
Biotic components
Abiotic components
Both (A) and (B)
None of these
Correct Marks 1
Incorrectly Marks 0
Q 11. Each step or level of the food chain forms a trophic level. The autotrophs comes at which trophic level
First
Second
Third
Fourth
Correct Marks 1
Incorrectly Marks 0
Q 12. Which of the following comes under consumers?
Herbivores
Carnivores
Parasite
All of these
Correct Marks 1
Incorrectly Marks 0
Q 13. 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
Correct Marks 1
Incorrectly Marks 0
Q 14. In 1987, which programme succeeded in forging an agreement to freeze CFC production at 1986 level.
UNEP
UNGP
AEP
None of these
Correct Marks 1
Incorrectly Marks 0
Q 15. {tex}\mathrm{Assertion}{/tex}: Each ecosystem contain only biotic components.
{tex}\mathrm{Reason}{/tex}: The autotrophs synthesize food material while heterotrophs utilise and resynthesize it.
Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'
Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'
Assertion is true but Reason is false
Assertion is false but Reason is true
Correct Marks 1
Incorrectly Marks 0
Q 16. Sulphur dioxide affects
haemoglobin of blood
Arteries
Alveoli of lungs
Nerves
Correct Marks 1
Incorrectly Marks 0
Q 17. Which of the following is not a functional component of an ecosystem?
Communities
Decomposers
Sunlight
Energy flow
The flow of energy is not a functional component of an ecosystem.
Correct Marks 1
Incorrectly Marks 0
Q 18. Free services provided to humans by ecosystems include
control of atmospheric carbon dioxide concentration
prevention of soil erosion
filtering of pollutants from water and air
all of the above
Correct Marks 1
Incorrectly Marks 0
Q 19. Why do scientists think that human-induced global warming will be more harmful to plants and animals than were past, natural climate fluctuations?
because temperatures will change faster
because the temperature changes will be larger
because species now are less adaptable than species in the past
because ecosystems are now more complicated than they used to be
Correct Marks 1
Incorrectly Marks 0
Q 20. As energy is passed from one trophic level to another, the amount of usable energy
increases
decreases
remains the same
energy is not passed from one trophic level to another
Correct Marks 1
Incorrectly Marks 0
Q 21. Each step in a food chain is called a
trophic level
consumer level
food web
producer
Correct Marks 1
Incorrectly Marks 0
Q 22. CO2 absorbs some of the __________ that radiates from the surface of earth to space
ozone
heat
food web
producer
Correct Marks 1
Incorrectly Marks 0
Q 23. The biological process by which carbon is returned to its reservoir is
photosynthesis
de-nitrification
carbon fixation
cellular respiration
Correct Marks 1
Incorrectly Marks 0
Q 24. For corrosion of metals, there should be
Exposed surface of metal
Moisture
Air
All of the above
Correct Marks 1
Incorrectly Marks 0
Q 25. The last chain of food is
producers
decomposers
parasites
none of the above