15


Q 1. In an ecosystem, Morchella, a fungus, converts
Organic compounds to inorganic compounds
Cyclic compounds to chain compounds
Inorganic compounds to organic compounds
Cyclic compounds to inorganic compounds
Q 2. Ozone layer of atmosphere protects us from which of the following harmful radiations?
Ultraviolet rays
Infrared rays
Magnetic rays
Ultraviolet and Infrared rays
Q 3. A-2 represents the trophic level 2, A-3 represents the trophic level 3, A-4 represents the trophic level 4 and A-1 represent the trophic level 1 in a food chain. Which trophic level will have the maximum energy available?
A-1
A-4
A-3
A-2
Q 4. Which of the following is an artificial ecosystem?
Ponds
Garden
Lakes
Forests
Q 5. What percentage of the total solar energy from sunlight falling on the leaves of a mango tree will be absorbed?
1%
10%
20%
30%
Q 6. Which of the following organisms return the nutrients to the soil?
Producers
Primary Consumers
Tertiary Consumers
Decomposers
Q 7. The use of which of the following substances must be avoided to prevent environmental pollution?
Medical syringes
Jute bags
Plastic tea cups
Nylon clothes
Q 8. Match the following: Column I Column II Producer Herbivores Small carnivores Large carnivores Third trophic level Second trophic level First trophic level Fourth trophic level
1-C; 2-B; 3-A; 4-D
1-B; 2-A; 3-C; 4-D
1-D; 2-A; 3-B; 4-C
1-C; 2-B; 3-D; 4-A
Q 9. The Sahara Desert was formed because of an uncontrolled human activity. It was
Excessive deforestation
Excessive killing of large carnivores
Excessive killing of producers
Excessive killing of omnivores
Q 10. Which of the following non- biodegradable waste can be recycled? Plastic Nuclear Waste Satellite Waste Rubber
Plastic, Nuclear waste and Satellite waste
Plastic and Satellite waste
Nuclear waste and Satellite waste
Plastic and Rubber
Q 11. Which agency is looking after the steps to reduce ozone depletion?
UNO
UNESCO
UNEP
WNO
Q 12. Which of the following is the best method for the disposal of hospital waste?
Composting
Incineration
Landfill
Burning waste
Q 13. The toxic chemical which is accumulating in humans through the food chain is
Gibberellin
Auxin
Dichlorodiphenyltrichloroethane
Chlorofluorocarbon
Q 14. From the following food chain, which organism can occupy the first or second trophic level? Grass → Goat → Human
Grass
Goat
Human
None of these
Q 15. Which of the following will get minimum energy in a food chain?
Herbivore
Producer
Carnivore
Large Carnivore
Q 16. If an apple tree has 5000 J of the total energy available, then how much energy will be available to its next trophic level?
500J
50J
5J
0.5J
Q 17. Which of the following pair is the one which shows abiotic: biotic component combination?
Microorganism: Plant
Microorganism: Human being
Soil: Temperature
Temperature: Microorganism
Q 18. What is the full form of UNEP?
United Nations Educational Programme
United National Environment Programme
United Nations Environmental Programme
United Nations Environment Programme
Q 19. In your city, separate dustbin for biodegradable and non-biodegradable waste has been placed. Can you tell the colour of these dustbins?
Green; Blue
Blue; Green
Red; Yellow
Yellow; Red
Q 20. In the food chain Grass → Goat → Human being, Human being receives 2 J of energy. What is the total amount of solar energy received by grass?
2000 J
200000 J
20000 J
200 J
Q 21. The layer of the atmosphere that contains the ozone blanket is
Mesosphere
Troposphere
Stratosphere
Thermosphere
Q 22. Food chains generally consist of only three or four steps because:
Only four trophic levels can be formed.
All organisms are covered in these steps
Very little usable energy is left after the fourth step
The food chain will break down
Q 23. Which of the following will occupy the first trophic level in a food chain in an ocean ecosystem?
Zooplankton
Phytoplankton
Corals
Sponges
Q 24. How much energy is available for the organisms of next trophic level?
90%
1%
75%
10%
Q 25. Which of the following are not the characteristics of bio-degradable substance?
Persists in the environment for a long time.
They will be broken down by the action of bacteria.
They do not harm the members of the ecosystem.
They change their form and structure over time
Q 26. Montreal Protocol was designed to prevent
Eutrophication
Ozone depletion
Biomagnification
Formation of smog
Q 27. What is primarily responsible for ozone depletion?
UV radiation
CFCs
Sun
CO
Q 28. Which trophic level has the greatest number of individuals?
  • 4th trophic level
  • 1st trophic level
  • 2nd trophic level
  • 3rd trophic level
Q 29. Which of the following disease is caused by ultraviolet radiations of the sun?
Eye defects
Skin cancer
Lung disease
Eye defects and skin cancer
Q 30. Which of the following is not the characteristic of a food chain?
Energy flow is multidirectional.
Biomagnification of harmful chemicals
3 to 4 trophic levels present
Green plants are the producers
Q 31. The flow of materials in an ecosystem is
Unidirectional
Cyclic
Bidirectional
Constant
Q 32. Which of the following bacteria act as decomposers in the ecosystem?
Azotobacter
Nitrosomonas
Cyanobacteria
Putrefying bacteria
Q 33. 200J of the Sun’s energy falls on a rose plant kept in a window? How much of the total Sun’s energy will the rose plant absorb?
20
2
0.2
0.02
Q 34. The flow of energy in an ecosystem is
Bidirectional
Unidirectional
Cyclic
Constant
Q 35. Which one of the following is not a consumer?
Shrimp
Squid
Octopus
Diatom
Q 36. In a food chain comprising grass, snake, rat, eagle and grasshopper, which organism will be at the third trophic level?
Rat
Snake
Eagle
Grasshopper
Q 37. What is the basis of grouping organisms into producers, consumer, and decomposers?
The manner in which they obtain sustenance from the environment.
Physiological Characters
Geographical distribution
Energy efficiency
Q 38. Which of the following statements is correct?
Green plants may not necessarily occupy the first trophic level in a forest ecosystem.
Green plants prepare their food by utilising inorganic substances.
Green plants absorb 10% of the total solar energy.
Green plants transfer 1% of the total available energy to the next trophic level.
Q 39. Which of the following is not the characteristic of bio-degradable substance?
They persist in environment for long time
They will be broken down by the action of bacteria
They do not harm the members of ecosystem
They change their form and structure over time.
Q 40. Why will we not get any energy if we try to eat coal?
Because coal is not edible
Coal cannot be digested
We do not have the enzymes which are needed for the breakdown of coal
Coal is a fuel and hence cannot be eaten

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