Biosphere Multiple Choice Questions
1. Biosphere is defined as
(A) Part of the earth water and atmosphere which inhabits living organism
(B) Part of the soil where animals and plants are found
(C) Atmosphere in which life exists
(D) None of the above
Answer: A
2. Biosphere consists of
(A) Lithosphere
(B) Atmosphere
(C) Hydrosphere
(D) All the above
Answer: D
3. Component of biosphere related with soil is
(A) Lithosphere
(B) Hydrosphere
(C) Atmosphere
(D) None of the above
Answer: A
4. Phenomenon of rain, dew, snow i.e., different forms of water coming to earth under force of gravity is called
(A) Geotropism
(B) Climatic factors
(C) Precipitation
(D) Calcification
Answer: C
5. Process of evapo-transpiration and precipitation is called
(A) Carbon cycle
(B) Nitrogen cycle
(C) Hydrological cycle
(D) All the above
Answer: C
6. Agents which make free atmospheric nitrogen available to plants are
(A) Lightening
(B) Free living nitrogen fixing bacteria
(C) Symbiotic nitrogen fixing bacteria
(D) All the above
Answer: D
7. Maintenance of soil fertility without addition of nutrition is due to
(A) Floods
(B) Crop residue
(C) Favourable temperature
(D) Microbial activity
Answer: D
8. A logical sequence of carbon cycle is
(A) Producer – Consumer – Decomposer
(B) Decomposer – Producer – Decomposer
(C) Consumer – Producer – Consumer
(D) Producer – Decomposer – Consumer
Answer: A
9. Rise of atmospheric temperature because of high concentration of carbon dioxide is known as
(A) Green house effect
(B) Biomagnification
(C) Pollution
(D) Ecotone
Answer: A
10. Source of energy in the biosphere is
(A) Producer
(B) Decomposer
(C) Sunlight
(D) Heat of earth
Answer: C
11. Earth is an
(A) Open system
(B) Closed system
(C) Both open and closed system
(D) Neither A nor B
Answer: C
12. Biogeochemical cycles are also known as
(A) Sedimentary cycles
(B) Gaseous cycles
(C) Material cycling
(D) Cycles of water
Answer: C
13. In one year one hectare of forest shall
(A) Consume 10 tonnes of CO2 and evolve 10 tonnes of O2
(B) Consume 20 tonnes of CO2 and evolve 10 tonnes of O2
(C) Consume 30 tonnes of CO2 and evolve 30 tonnes of O2
(D) Consume 30 tonnes of CO2 and evolve 10 tonnes of O2
Answer: D
14. Amount of carbon fixed annually through photosynthesis is
(A) 4.6 x 1010 kg
(B) 7 x 1013 kg
(C) 7 x 1020 kg
(D) 4.6 x 1021 kg
Answer: B
15. Climate of the world is threatened by
(A) Increasing concentration of atmospheric oxygen
(B) Decreasing amount of atmospheric oxygen
(C) Increasing amount of atmospheric carbon dioxide
(D) Decreasing amount of atmospheric carbon dioxide
Answer: C
16. Green House gases are
(A) Absorbers of long-wave radiations from earth
(B) Transparent to both solar radiations and long-wave radiations from earth
(C) Absorbers of solar radiations for warming the atmosphere of earth
(D) Transparent to emissions from earth for passage into outer space
Answer: A
17. Nonbiological nitrogen fixation is
(A) Electrochemical and photochemical
(B) Rhizobial
(C) Cyanobacterail
(D) None od the above
Answer: A
18. Pseudomonas is an important component of nitrogen cycle. It
(A) Fixes elemental nitrogen
(B) Produces elemental nitrogen
(C) Transfers nitrogen
(D) Changes ammonium nitrogen to nitrate state
Answer: B
19. Water cycle is made up of two overlapping cycles
(A) Ground water atmospheric cycles
(B) Surface water and atmospheric cycles
(C) Global and local cycles
(D) Oceanic and fresh water cycles
Answer: C
20. Sedimentary cycle having a small gaseous component is found in
(A) Phosphorus
(B) Nitrogen
(C) Carbon
(D) Sulphur
Answer: D
21. Earth is protected from ultra-violet radiations by means of
(A) Ozone layer
(B) Nitrogen
(C) Oxygen
(D) Carbon dioxide
Answer: A
22. Ozone layer occurs in
(A) Ionosphere
(B) Stratosphere
(C) Thermosphere
(D) Troposphere
Answer: B
23. Ecosystems obtain nitrogen from outside through the process of
(A) Industrial fixation
(B) Electrochemical and photochemical fixation
(C) Biological fixation
(D) All the above
Answer: D
24. Earth is an open system for
(A) Minerals
(B) Energy
(C) Gases
(D) Water
Answer: B
25. Lithosphere is reservoir of
(A) Carbon
(B) Oxygen
(C) Phosphorous
(D) Nitrogen
Answer: C
26. Amount of nitrogen fixed by nitrogen fixing organisms is
(A) 70%
(B) 30%
(C) 50%
(D) 90%
Answer: A
27. Carbon is found in lithosphere as
(A) Carbohydrate
(B) Carbonic acid
(C) Carbon
(D) Carbonate
Answer: D
28. Which has a sedimentary cycle
(A) Nitrogen
(B) Carbon
(C) Water
(D) Sulphur
Answer: D
29. Maximum control of hydrological cycle is exerted by
(A) Epiphytes
(B) Forests
(C) Plankton
(D) Grassland
Answer: B
30. Ecological cycle directly driven by sunlight is
(A) Carbon
(B) Phosphorus
(C) Hydrologic
(D) Nitrogen
Answer: C
31. Biosphere is
(A) Area occupied by living beings
(B) Plants of the world
(C) Plants of a particular area
(D) Special plants
Answer: A
32. Source of carbon to plants is
(A) Carbon dioxide of carbonate rocks
(B) Fossil fuels
(C) Atmospheric carbon dioxide
(D) All the above
Answer: C
33. Biogeochemical cycle refers to cycling of
(A) Sediments
(B) Nutrient in the ecosystem
(C) Water
(D) Gases between plants and animals
Answer: B
34. Gas being produced by paddy fields and involved in global warming is
(A) Chlorine
(B) Methane
(C) CO2
(D) H2S
Answer: B
35. Green house effect is warming due to
(A) Infra-red rays reaching earth
(B) Moisture layer in atmosphere
(C) Increase in temperature due to increase in carbon dioxide concentration of atmosphere
(D) Ozone layer of atmosphere
Answer: C
36. Green house effect is related to
(A) Increased growth of green algae
(B) Global warming
(C) Cultivation of vegetables in houses
(D) Development of terrace gardens
Answer: B
37. Green house gases include
(A) CO2, CFC, CH4 and NO2
(B) CO2, O2, N2, NO2 and NH3
(C) CH4, N2, CO2 and NH3
(D) CFC, CO2, NH3 and N2
Answer: A
38. The circulation or cycling of elements in an ecosystem is known as
(A) Geological cycling
(B) Geo-chemical cycling
(C) Bio-geochemical cycling
(D) Chemical cycling
Answer: C
39. The sphere of living matter found on the surface of earth comprises
(A) Lithosphere
(B) Hydrosphere
(C) Atmosphere
(D) Biosphere
Answer: D
40. The term biosphere is used for a zone containing living beings
(A) In lithosphere, hydrosphere and atmosphere
(B) In lithosphere and hydrosphere
(C) In hydrosphere
(D) On lithosphere
Answer: A
41. Biosphere is made of
(A) Living beings and their remains
(B) Living beings + Lithosphere + Hydrosphere + Atmosphere
(C) Living beings + Lithosphere
(D) Living organisms+ Lithosphere + Hydrosphere
Answer: B
42. Which is not a green house gas
(A) Chlorofluorocarbon
(B) Methane
(C) Carbon dioxide
(D) Hydrogen
Answer: D
43. Concentration of green house gases is increasing due to
(A) Deforestation
(B) Increased use of refrigerators
(C) Increased combustion of coal and petroleum
(D) All the above
Answer: D
44. Which gas contributes more to green house effect
(A) CFC
(B) Freon
(C) CO2
(D) CH4
Answer: C
45. Which gas of the atmospheric holds up ultraviolet rays
(A) O2
(B) O3
(C) N2
(D) CO2
Answer: B
46. Checking of re-radiating heat by atmospheric dust, O3, CO2, and water vapour is
(A) Ozone layer effect
(B) Solar effect
(C) Radioactive effect
(D) Green house effect
Answer: D
47. Liberation of H2S/foul smell in water of tanks, ponds, etc. is due to
(A) Anaerobiosis
(B) Aerobiosis
(C) Psammophytes
(D) Biological magnification
Answer: A
48. CO2 and O2 balance in atmosphere is due to
(A) Photosynthesis
(B) Respiration
(C) Leaf anatomy
(D) Photorespiration
Answer: A
49. Biosphere is
(A) A protected area
(B) Ecosystem
(C) In which individuals interact
(D) Earth crust
Answer: D
50. Fertiliser obtained from Sea Birds along the coast of Chile and Peru is
(A) Guano
(B) Bone meal
(C) Dung
(D) Urea
Answer: A