Bsc biotechnology environmental science 70 objective questions

By Dr Nishi Kant
Biotechnology Department
Health and Allied Science
70 OBJECTIVE QUESTIONS OF ENVIRONMENTAL SCIENCE 1ST SEM BSC
BIOTECHNOLOGY
1. The atmosphere is divided into following four layers:
a) Mesophere
b) Stratosphere
c) Thermosphere
d) Troposhere
The correct sequence of these layers stating from the surface of earth upwards is
a) II IV I III
b) IV II I III
c) IV II III I
d) II IV III I
2. Earth’s environment is mainly influenced by two forms of solar energy.
a) Light and Heat
b) X- Rays and ƴ-rays
c) Low and high frequency radio waves
d) Infra red and ultraviolet rays
3. Sulphur dioxide is a
a) Yellow-brown gas that contributes to photochemical smog
b) Colourless and odourless gas that binds to haemoglobin in blood
c) Colorless and odourless gas that damages the lungs
d) Gas with a rotten egg odor that is highly toxic and corrosive
4. Nitrogen oxides (NOx) are
a) Yellow brown gases that contribute to photochemical smog
b) Colorless and odoeless gasses that bind to haemoglobin in blood
c) Colorless and odrless gasses that damage the lungs
d) Gasses with a rotten egg odor that are highly toxic and corrosive
5. Carbon monoxide (CO) is a
a) Yellow brown gas that contributes to photochemical smog
b) Colorless and odourless gas that binds to haemoglobin in blood
c) Colorless and odourless gas that damage the lungs
d) Gasses with a rotten egg odor that are highly toxic and corrosive
6. Ozone (O3) is a
a) Yellow brown gas that contributes to photochemical smog
b) Colorless and odourless gas that binds to haemoglobin in blood
c) Colorless and odourless gas that damage the lungs
d) Reactive gas produced in part by photochemical reaction of sunlight with various air
pollutants
7. Greenhouse gases include
a) Methane
b) Nitrous oxide
c) Ozone
d) All of these

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8. Common heavy metals that pollute soil and water include
a) Cadmium
b) Lead
c) Mercury
d) All of these
9. The main causes of eutrophication of lakes is the enrichment of lake water with
a) Carbonaceous organic matter
b) Nutrients
c) Chlorides
d) Water hyacinth
10. What does BOD stands for
a) Bacterial Oxygen Dependency
b) Biodegradable Organic Damage
c) Biological Oxygen Depletion
d) Biochemical Oxygen Demand
11. Which of the following is not associated with eutrophication?
a) Algal blooms
b) Increased concentration of toxins
c) Increased nutrients concentrations
d) Reduced dissolved oxygen
12. You are a scientist monitoring disease potential of wastewater treated at a sewage treatment plant.
You are most concerned with the concentration of which of the following:
a) Oxygen demanding waste(BOD)
b) Heavy metals
c) Radioactive materials
d) Faecalcoliform bacteria.
13. Non renewable resurces include
a) Coal
b) Oil
c) Natural gases
d) All of these
14. Biogas predominantly contains
a) CH4
b) NH3
c) SO2
d) ethane

By Dr Nishi Kant
15. The three R’s of integrated waste management are
a) Recreate,reinvest and realign
b) Reduce,reuse, and recycle
c) Reabsorb, reduce,and restructure
d) React, reach,and readdress
16. All of the following are renewable energy sources EXCEPT
a) Nuclear fission
b) Wind
c) Solar
d) hydroelectric
17. Photovoltaic systems utilize solar energy by
a) Heating water with solar radiation
b) Mirrors focus sunlight on a central collector unit
c) Generating electricity directly from sunlight
d) E. Electrolyzing water into its components hydrogen and oxygen
18. In some ways natural gas is considered a better fossil fuel than oil. This is primarily because
a) Gas is found at shallower depths than oil
b) Gas is easier and more versatile to transport
c) Gas is a renewable resource
d) Burning natural gas is cleaner than burning oil
19. Which of the following is NOT a greenhouse gas?
a) Methane
b) CFCS
c) Water vapour
d) Ozone
20. Composting is a ...... process in which organic materials is decomposed by......organisms
a) Chemical; aerobic
b) Biochemical; coliform
c) Geological; anaerobic
d) Biochemical;areobic
21. The most significant effect of improper disposal of hazardous waster is
a) Pollution of air
b) Pollution of land
c) Pollution of groundwater
d) Breeding of pests
22. Atmospheric carbon is assimilated by
a) Primary producers

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b) Decomposers
c) Herbivores
d) consumers
23. Nitrification of the soil is naturally done by
a) Farmers
b) Earthworms
c) Bacteria
d) Ants
24. The process of converting atmospheric nitrogen into ammonium by microorganisms is called
a) Nitrification
b) Nitrogen fixation
c) Metabolism
d) Fertilization
25. Bacteria that are commonly associated with root nodules are
a) Rhizobium
b) Bacillus
c) Pseudomonas
d) None of these
26. Mycorrhiza is a soil fungi that is associated with
a) Roots of trees
b) Leaves
c) Seeds
d) None of these
27. The world’s most productive ecosystems are
a) Deserts
b) Mountains
c) Coral reefs
d) rainforests
28. Which of the following is an abiotic component or the ecosystem?
a) Bacteria
b) Plants
c) Humans
d) Fungi

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29. A biome is characterized by
a) Vegetation
b) Habitats
c) Biological communities
d) All of these
30. Species coexit in the form of
a) Biological communities
b) Populations
c) Societies
d) colonies
31. A species may be classified as rare or common based on
a) Geographical range
b) Habitat choice
c) Population size
d) All of these
32. Changes in population size are brought about by
a) Births
b) Deaths
c) Migrations
d) All of these
33. Terrestrial ecosystems that functions without trees
a) Deserts
b) Scrublands
c) Grasslands
d) All of these
34. People have and have had in the past, great influence on the biological diversity in their
surroundings environment as a result of
a) Hunting
b) Habitat destruction
c) Introduction of non native species
d) All of these
35. Desserts occur naturally where
a) There is low temperature and low rainfall throughout the year
b) There is too little water for substantial plant growth
c) Overgrazing removes water holding vegetation
d) Sand supply exceeds the ability of wind to transport it away
36. An ecosystem

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a) Introduces life to the environment
b) Is the smallest system that includes and sustains life
c) Is a set of interacting species that occur at the same place
d) Is a equivalent to an ecological community
37. The simplest ecosystem needs.... to function properly
a) One species that produces its own food also decomposes it plus water air
b) Air and water
c) One species that produces its own food and a second that decomposes the waste of the first one
plus water and air
d) Nutrients and water
38. The most basic processes in an ecosystem are
a) Photosynthesis and respiration
b) Transport and storage of food
c) Tropic chains and storage of food
d) Flow of energy and cycling of chemical elements
39. Energy , chemical elements, and other compounds are transferred from creature to creature along
a) Symbiotic links
b) Food chains
c) Biogeochemical cycles
d) Trophic levels
40. Autotrophs are the first trophic levels get their food chains from
a) Organic chemicals
b) Inorganic chemicals and sunlight
c) Sunlight air and water
d) Chemosynthesis
41. The maximum population that can be sustained indefinitely by the environment is called
a) Inflection point
b) Carrying capacity
c) Logistic capacity
d) Demographic transition
42. A species that is native to a particular location and not native elsewhere is called a(n)
a) Exotic species
b) Endemic species
c) Cosmopolitan species

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d) Ubiquitous species
43. Biomass is the amount of organic matter and might be typically measured in units of mass per
unit area. The change in biomass is called.......
a) Net production
b) Deforestation
c) Productivity
d) Organic flux
44. If net production is subtracted from gross production, the difference is due to
a) Biomass
b) Energy lost from earth system
c) Energy gained by the earth system
d) Respiration
45. The amount of organic matter is called
a) Biomes
b) Biomass
c) Primary productivity
d) Organic mass compound
46. World wetlands day is observed on
a) February 2
b) June 5
c) April 22
d) March 8
47. Kyoto is located in
a) Korea
b) Japan
c) USA
d) Brazil
48. Air Act was enacted in
a) 1981
b) 1974
c) 1992
d) 1985
49. Biological Diversity Act was enacted in
a) 1992
b) 1995
c) 2002
d) 1983

By Dr Nishi Kant
50. World Environmental Day observed on
a) February 2
b) June 5
c) April 22
d) March 8
51. The depth in soils and rocks which contains moisture is called
a) Zone of aeration
b) Zone of saturation
c) Water table
d) None of these
52. Planting of trees where it was cut before is termed as
a) Reforestation
b) Afforestaion
c) Deforestation
d) None of these
53. Conservation of species at their original habitat is called as
a) Ex situ conservation
b) In situ conservation
c) All of these
d) none of these
54. The most toxic air pollutant for human beings is
a) CO
b) SO2
c) CFC
d) All of These
55. The primary pollutant caused by incomplete combustion of organic matter is
a) Ozone
b) Carbon monoxide
c) Sulphur dioxide
d) None of these
56. Effect of increasing CO2 in air is
a) Heating
b) Cooling
c) Increasing pollution
d) None of these
57. The process of corrosion is enhanced by
a) Air and moisture

By Dr Nishi Kant
b) Electrolytes in water
c) Metallic impurities and gasses like CO2 and SO2
d) All of the above
58. Pollutants is
a) Undesirable foreign matter
b) Desirable foreign matter
c) Required foreign matter
d) Useful foreign matter
59. Smog is mixture of fog and
a) Gasses
b) Smoke
c) Pollutants
d) oxides
60. From the following identify the metal which cannot pollute environment
a) As
b) Pb
c) Pt
d) hg
61. Groundwater is usually free from
a) Suspended impurities
b) Dissolved impurities
c) Both i and ii
d) None of the above
62. Acid precipitation results from human modification of
a) The nitrogen and phosphorous cycle
b) The nitrogen and sulphur cycle
c) The carbon and slfur cycle
d) The carbon and nitrogen cycle
63. Increase in concentration of toxins from one trophic levels to another trophic level is called
a) Biomagnifications
b) Bioaccumulation
c) Ecological toxication
d) All of the above
64. Carnivorous plants are found in
a) Nitrogen deficient soil
b) O2 deficient soil
c) CO2 Deficient Soil

By Dr Nishi Kant
d) All of the above
65. The main reason for extinction of species is
a) Hunting
b) Destruction of habitat
c) Pollution
d) None of these
66. Which pollutant does leave any residue
a) Organic matter
b) Ionic radiation
c) Insect hormone
d) DDT
67. Chlorofluorocarbons are not recommended to be used in refrigerators because they
a) Increase temperature
b) Deplete ozone layer
c) Affect environment
d) Affects human body
68. Which pollutant does leave any residue
a) Organic matter
b) Ionic radiation
c) Insect hormone
d) DDT
69. Development activities on the hydrosphere cause
a) Air pollution
b) Soil pollution
c) Water pollution
d) Soil erosion
70.A group of living organisms of the same kind living in the same place and at
the same time refers to a
a) Community
b) Species
c) Population
d) Consumers

By Dr Nishi Kant

By Dr Nishi Kant
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Bsc biotechnology environmental science 70 objective questions

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