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Ecosystem

Board » Bihar Board » Class 12th » English Medium » Science » Biology » L-14 : Ecosystem

Objective Questions (MCQs)

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ID- 10830
BSEB, 2019 (C)

1. Which among the following is an example of xerophytic adoption?

  • (A) Moss
  • (B) Zinnia
  • (C) Rose
  • (D) Opuntia
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ID- 10831
BSEB, 2015, 2019 (C), 2021 (A)

2. Which one of the following is insectivorous plant?

  • (A) Drosera
  • (B) Nepenthes
  • (C) Both 'A' and 'B'
  • (D) Hydrilla
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EXPLANATION:

Orobanche, Balanophora and Rafflesia are obligate total root parasite. Drosera is sundew plant and is an insectivorous plant. The captured insect is digested by proteolytic secretions from the leaf.

Therefore, option A is correct.

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ID- 10832
BSEB, 2015

3. Regulation of spermatogenesis is done by:

  • (A) oestrogen
  • (B) L.H.
  • (C) androgen
  • (D) none of these
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ID- 10833
BSEB, 2013, 2021 (A)

4. Secondary productivity is related to:

  • (A) Producers
  • (B) Herbivores
  • (C) Carnivores
  • (D) None of these
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ID- 10834
BSEB, 2012

5. Which of the following factor is important in the formation of new species?

  • (A) Competition
  • (B) Mutation
  • (C) Isolation
  • (D) Continous variation
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ID- 10835
BSEB, 2011

6. Green plants in an ecosystem are:

  • (A) Producers
  • (B) Consumers
  • (C) Decomposers
  • (D) None of these
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ID- 10836

7. Frog feeding on herbivorous insect is:

  • (A) Primary consumer
  • (B) Secondary consumer
  • (C) Tertiary consumer
  • (D) Top carnivore
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ID- 10837

8. Controlling factor in ecosystem is:

  • (A) Soil moisture
  • (B) Food
  • (C) Predation
  • (D) Temperature
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ID- 10838

9. The term biocoenosis was coined by:

  • (A) Darwin
  • (B) Haeckel
  • (C) Odum
  • (D) Mobius
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ID- 10839

10. Decomposers are:

  • (A) Animalia and Monera
  • (B) Protista and Animalia
  • (C) Fungi and Plantae
  • (D) Bacteria and Fungi
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ID- 10840

11. In a biotic community primary consumers are:

  • (A) Carnivores
  • (B) Detrivores
  • (C) Herbivores
  • (D) Omnivores
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ID- 10841
BSEB, 2013

12. Who introduced term Ecosystem?

  • (A) A.G. Tansley
  • (B) Reiter
  • (C) Odum
  • (D) Aristle
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ID- 10842

13. Soil developed from sedimented rock:

  • (A) force Science
  • (B) Edaphology
  • (C) Pedogenesis
  • (D) All of these
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ID- 10843

14. Xerophyte Contains:

  • (A) Deep roots
  • (B) Sunken stomata
  • (C) Thick cuticle
  • (D) All of these
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ID- 10844

15. During food chain the maximum energy is stored in:

  • (A) Producers
  • (B) Decomposers
  • (C) Herbivoures
  • (D) Carnivoures
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ID- 10845

16. The average efficiency of energy transfer from herbivore to carnivore level is:

  • (A) 5%
  • (B) 10%
  • (C) 20%
  • (D) 30%
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ID- 10846

17. Ecological pyramids were first devised by:

  • (A) Charles Elton
  • (B) R. Hesse
  • (C) R. A. Lindemann
  • (D) Justus von Liebig
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ID- 10847

18. In the phosphorus cycle, weathering makes phosphate available first to:

  • (A) Producers
  • (B) Decomposers
  • (C) Consumers
  • (D) None of these
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ID- 10848
BSEB, 2020 (A)

19. Which type of the following pyramid are never inverted?

  • (A) Pyramid of energy
  • (B) Pyramid of biomass
  • (C) Pyramid of number
  • (D) Pyramid of dry biomass
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ID- 10849

20. Biosphere means:

  • (A) Atmosphere
  • (B) Lithosphere and ionosphere
  • (C) Atmosphere, lithosphere and hydrosphere
  • (D) Hydrosphere, lithosphere and ionosphere
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ID- 10850

21. The largest ecosystem is:

  • (A) Forest ecosystem
  • (B) Marine ecosystem
  • (C) Pond ecosystem
  • (D) Grassland ecosystem
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ID- 10851

22. Ecology deals with:

  • (A) The earths and plants
  • (B) The relationship between organisms and their environment
  • (C) Economical growth of poor people
  • (D) The life under sea
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ID- 10852

23. Which one of the following is most productive ecosystem?

  • (A) Temperate forest
  • (B) Grassland
  • (C) Desert
  • (D) Tropical rain forest
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ID- 10853

24. 'Calcifuges' are the plants growing in:

  • (A) low calcium
  • (B) high calcium
  • (C) moderate calcium
  • (D) none of these
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ID- 10854
BSEB, 2019 (A), 2019 (C)

25. Water holding capacity is one of the qualities of:

  • (A) Soil
  • (B) Plants
  • (C) Water
  • (D) Animals
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ID- 10855

26. .......... is the rate of production of organic matter by consumers.

  • (A) Primary productivity
  • (B) Secondary productivity
  • (C) Net primary productivity
  • (D) Gross primary productivity
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ID- 10856

27. The annual net primary productivity of the whole biosphere is approximately:

  • (A) 150 billion tons
  • (B) 160 billion tons
  • (C) 170 billion tons
  • (D) 180 billion tons
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ID- 10857

28. The rate of formation of new organic matter by rabbit in a grassland, is called:

  • (A) net productivity
  • (B) secondary productivity
  • (C) net primary productivity
  • (D) gross primary productivity
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ID- 10858

29. Which one of the following exhibits least productivity?

  • (A) Salty marshes
  • (B) Grasslands
  • (C) Open oceans
  • (D) Coral reefs
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ID- 10859

30. During the process of decomposition:

  • (A) CO2 is consumed and O2 is released
  • (B) O2 is consumed and CO2 is released
  • (C) CO2 is consumed and H2O is released
  • (D) none of these
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ID- 10860

31. Rate of decomposition depends upon:

  • (A) chemical composition of detritus
  • (B) temperature
  • (C) soil moisture and soil pH
  • (D) all of these
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ID- 11006

32. Select the incorrect foof chain:

  • (A) Grass → Grasshopper → Frog → Snake → Eagle
  • (B) Phytoplanktons →Zooplanktons → Small fish → Large fish
  • (C) Diatoms → Zooplanktons → Small fish
  • (D) Grass → Frog → Vulture
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ID- 11007

33. Organisms which are associated which first as well as third trophic level are:

  • (A) macrophytes
  • (B) phytoplanktons
  • (C) chemoautotrophs
  • (D) insectivorous plants
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ID- 11008

34. In lithosere, foliose lichens make the conditions favourable for the growth of

  • (A) crustose lichens
  • (B) mosses
  • (C) annual grasses
  • (D) perennial grasses
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ID- 11009

35. Correct sequence of stages of succession on a bare rock is:

  • (A) Lichens→Mosses→Grasses→Shrubs→Trees
  • (B) Trees→Shrubs→Lichens→Mosses→Grasses
  • (C) Mosses→Shrubs→Trees→Lichens→Grasses
  • (D) Mosses→Lichens→Grasses→Shrubs→Trees
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ID- 11010

36. The second stage of hydrosere is occupied by plant like

  • (A) Azolla
  • (B) Typha
  • (C) Carex
  • (D) Vallisneria
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ID- 11011

37. About 70% of total global carbon is found in:

  • (A) oceans
  • (B) forests
  • (C) grasslands
  • (D) agroecosystems
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ID- 11012

38. Source of maximum sulphur is:

  • (A) oceans
  • (B) land
  • (C) rocks
  • (D) lakes
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ID- 11013

39. Which of the following is not a producer?

  • (A) Spirogyra
  • (B) Agaricus
  • (C) Volvox
  • (D) Nostoc
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ID- 11014
BSEB, 2011, 2021 (A)

40. Which of the following is the correct food chain?

  • (A) Grass, Wheat & Mango
  • (B) Goat, Cow and Grass
  • (C) Grass, Goat and Lion
  • (D) Grass, Fish and Goat
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ID- 11015

41. Climax community is in a stage of:

  • (A) non-equilibrium
  • (B) equilibrium
  • (C) disorder
  • (D) constant change
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ID- 11016

42. The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:

  • (A) Pelagic zone
  • (B) Benthic zone
  • (C) Lentic zone
  • (D) Littoral zone
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ID- 11017

43. Edaphic factor refers to

  • (A) water
  • (B) soil
  • (C) relative humidity
  • (D) attitude
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ID- 11018
BSEB, 2016 (C)

44. The main source of energy in ecosystem:

  • (A) Green plants
  • (B) Sun
  • (C) Wind
  • (D) All of the above
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ID- 11019
BSEB, 2017 (A), 2019 (C), 2021 (A)

45. Flow of energy in food chain of an Ecosystem is:

  • (A) Unidirectional
  • (B) Bidirectional
  • (C) Multidirectional
  • (D) None
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ID- 11020
BSEB, 2017 (C), 2017 (C)

46. Tiger is a consumer of:

  • (A) Primary
  • (B) Secondary
  • (C) Tirtiary
  • (D) None of these
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