9 ECOSYSTEM (UHS)

9 ECOSYSTEM (UHS)

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Question 1 of 28

1. Question
Q.1 Which one of the following is depleting and causing thinning of ozone?
- A) Chlorine
- B) Bromine
- C) Chlorofluorocarbon
- D) Carbon
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Question 2 of 28

2. Question
Q.2 The typical environment of a particular organism population community is called
- A) Niche
- B) Ecosystem
- C) Habitat
- D) Biosphere
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Question 3 of 28

3. Question
Q.3 Excessive enrichment of water with nutrients by human activity by which large amount of living
organic matter grows is called
- A) Archeotrophication
- B) Eutrophication
- C) Enrichment
- D) Low Trophication
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Question 4 of 28

4. Question
Q.4 In an ecosystem, mycorrhizae is an example of
- A) Symbiosis
- B) Predation
- C) Commensalism
- D) Parasitism
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Question 5 of 28

5. Question
Q.5 Successive stages of eating and being eaten by which recycling of materials and flow of energy
takes place is called
- A) Food Chain
- B) Food Web
- C) Trophic Level
- D) Food Link
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Question 6 of 28

6. Question
Q.6 What is the niche of an organism in an ecosystem?
- A) Role played by many organisms in an ecosystem
- B) Role played by a dead organism in an ecosystem
- C) Role played by community of microorganisms in their ecosystem
- D) Role played by an organism in its ecosystem.
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Question 7 of 28

7. Question
Q.7 The distinct levels or links of food chain are called
- A) Trophic level
- B) Food web
- C) Energy pyramid
- D) Food chain
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Question 8 of 28

8. Question
Q.8 A relationship between two or more organisms of different species in which all partners get
benefit is called
- A) Symbiosis
- B) Parasitism
- C) Commensalism
- D) Predation
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Question 9 of 28

9. Question
Q.9 Bacteria and fungi are examples of
- A) Producers
- B) Decomposers
- C) Consumers
- D) Denvers
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Question 10 of 28

10. Question
Q.10 The cause of acid rain is
- A) Oxides of carbon
- B) Oxides of nitrogen and Sulphur
- C) Oxides of Sulphur
- D) Oxides of nitrogen
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Question 11 of 28

11. Question
Q.11 In an ecosystem mycorrhizae are an example of:
- A) Predation
- B) Symbiosis
- C) Mutualism
- D) Parasitism
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Question 12 of 28

12. Question
Q.12 As a result of destruction of ozone layer there is significant increase in:
- A) Ultra-violet radiations
- B) Greenhouse gases
- C) Nitrogen oxide
- D) Sulphur oxide
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Question 13 of 28

13. Question
Q.13 Higher rate of a biological activity in a nutrient rich pond water is called:
- A) Water pollution
- B) Air pollution
- C) Eutrophication
- D) Industrial effects
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Question 14 of 28

14. Question
Q.14 Living part of ecosystem is:
- A) lithosphere
- B) Hydrosphere
- C) Community
- D) Biosphere
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Question 15 of 28

15. Question
Q.15 A living association between two living organisms of different species which is beneficial to both
the partners is called:
- A) Commensalism
- B) Parasitism
- C) Mutualism
- D) Predation
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Question 16 of 28

16. Question
Q.16 Individual successions are known as
- A) Primary successions
- B) Secondary successions
- C) Seres
- C) Seres
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Question 17 of 28

17. Question
Q.17 Which one of the following is the ultimate distributional unit within which a species is restrained
by the limitations of its physical structure and physiology?
- A) Niche
- B) Biome
- C) Ecosystem
- D) Habitat
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Question 18 of 28

18. Question
Q.18 All herbivores belong to which trophic level in the food chain?
- A) T1
- B) T2
- B) T2
- B) T2
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Question 19 of 28

19. Question
Q.20 The relationship in which one organism gets benefit and the other is not affected is called
- A) Mutualism
- B) Commensalism
- C) Predation
- D) Parasitism
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Question 20 of 28

20. Question
Q.21 Ozone is a layer of atmosphere extending from ___________ km above earth and absorbs
ultraviolent radiations.
- A) 10-50
- B) 50-60
- C) 5-30
- D) 10-80
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Question 21 of 28

21. Question
Q.22 Light rays from the sun are absorbed by CO2 and re-radiate as ________ radiations.
- A) Ultraviolent
- B) Indigo
- C) Infra-Red
- D) Green
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Question 22 of 28

22. Question
Q.23 The gases which are produced by burning of fossils fuels and are responsible for acid rain are:
- A) CFCs
- B) CO2 and CO
- C) HCl and Oxides of Nitrogen
- D) SO2 and Oxides of Nitrogen
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Question 23 of 28

23. Question
Q.24 During successions, the first organisms that develop on bare rock are:
- A) Lichens
- B) Shrubs
- C) Moss
- D) Herbs
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Question 24 of 28

24. Question
Q.26 The organisms of third trophic level are:
- A) Primary consumer
- B) Primary producer
- C) Tertiary consumer
- D) Secondary consumer
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Question 25 of 28

25. Question
Q.27 The ultimate source of energy in an ecosystem is:
- A) Photosynthesis
- B) Sun
- C) Plants
- D) Water
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Question 26 of 28

26. Question
Q.28 All the food chains and food webs begin with:
- A) Detritus
- B) Herbivores
- C) Green plants
- D) Omnivores
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Question 27 of 28

27. Question
Q.29 The change from bare rock or open area is rapid, especially in the initial stages and follows a
series of recognizable and hence predictable stages. This process is called:
- A) Pioneers
- B) Xerosere
- C) Succession
- D) Secondary succession
Correct

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Question 28 of 28

28. Question
Q.30 The decline in the thickness of ozone layer is caused by:
- A) Increasing level of nitrogen oxide
- B) Decreasing level of O2
- C) Decreasing level of CFCs
- D) Increasing level of CFCs
Correct

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