NEET Biology Environmental Issue And Environmental Pollution Question Bank

done Self Evaluation Test - Environmental Issues Total Questions - 80

• question_answer1)
  Bhopal gas accident occurred in which year and due to which gas?
  A)
  1986/Methyl isocynate done clear
  B)
  1984/Methyl isocynate done clear
  C)
  1985/CO done clear
  D)
  1985/Ethyl isocynate done clear
  View Solution play_arrow

• question_answer2)
  Photochemical smog does not include:
  A)
  PAN                                          done clear
  B)
  \[N{{O}_{x}}\] done clear
  C)
  CO                                           done clear
  D)
  \[{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer3)
  DDT causes egg shell thinning in birds because it inhibits:
  A)
  calmodulin                                 done clear
  B)
  calcium ATPase done clear
  C)
  magnesium ATPase                     done clear
  D)
  carbonic anhydrase done clear
  View Solution play_arrow

• question_answer4)
  The accompanying graph follows the progress of an algal bloom and two associated environmental factors over the course of a year in the North Atlantic Ocean.              Which line in the table given the correct identity of W, X and Y?
  A)

  Relative number of algae	Relative light intensity	Relative concentration of nutrate
  W	Y	X

    done clear
  B)

  X

  W

  Y

    done clear
  C)

  W

  X

  Y

    done clear
  D)

  X

  Y

  W

    done clear
  View Solution play_arrow

• question_answer5)
  Ozone layer in stratosphere is effected by:
  A)
  Excess \[C{{O}_{2}}\]               done clear
  B)
  Excess CO done clear
  C)
  Chloro-fluoro-carbon                   done clear
  D)
  Low rainfall done clear
  View Solution play_arrow

• question_answer6)
  Why is the concentration of ozone less over the north and south poles?
  A)
  CFCs accumulate only in area where the air is cold done clear
  B)
  CFC use is highest in these areas done clear
  C)
  CFCs stick to frozen water vapour and are able to act catalysts done clear
  D)
  UV rays are stronger in the atmosphere done clear
  View Solution play_arrow

• question_answer7)
  The percentage of air pollution caused due to smoke is:
  A)
  10-15%       done clear
  B)
  15-20% done clear
  C)
  20-25%                                     done clear
  D)
  2-5% done clear
  View Solution play_arrow

• question_answer8)
  Increase in productivity most likely cause loss of species because:
  A)
  those species that increase in productivity outcompete other species. done clear
  B)
  the causes of increased productivity in one species do not necessarily have the same effect in all species. done clear
  C)
  there are inadequate resources available for productivity increases in all species. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer9)
  The maximum biological magnification of DDT through food web is seen in:
  A)
  Algae                                        done clear
  B)
  Bacteria done clear
  C)
  Higher plants                              done clear
  D)
  Man done clear
  View Solution play_arrow

• question_answer10)
  In "case \[C{{O}_{2}}\] of earth's atmosphere disappears, the temperature of earth's surface would:
  A)
  Increase done clear
  B)
  Decrease done clear
  C)
  Depend on oxygen concentration done clear
  D)
  Remain the same done clear
  View Solution play_arrow

• question_answer11)
  The below diagram shows electrostatic precipitator. Identify 1, 2 and 3.      
  A)
  1 - Discharge corona, 2 - Negatively charged wire, 3 - Collection plate grounded done clear
  B)
  1 - Discharge corona, 2 - Positively charged wire, 3 - Collection plate grounded done clear
  C)
  1 - Discharge corona, 2 - Negatively charged wire, 3 - Collection plate burnt done clear
  D)
  1 - Uncharge corona, 2 - Positively charged wire, 3 - Collection plate never grounded done clear
  View Solution play_arrow

• question_answer12)
  The diagram below shows the effect of polluting a river with untreated whey. What does graph X represent?
  A)
  Bacterial count done clear
  B)
  Number of fish done clear
  C)
  Mass of curds done clear
  D)
  Concentration of rennet done clear
  View Solution play_arrow

• question_answer13)
  Pollution of \[S{{O}_{2}}\] destroys:
  A)
  Fungi                                         done clear
  B)
  Lichen done clear
  C)
  Algae                                        done clear
  D)
  Fishes done clear
  View Solution play_arrow

• question_answer14)
  Which organisms in a food chain consisting of algae, copepods (small crustaceans), small fish, large fish, and ospreys (fish-eating birds of prey) would have the highest concentrations of DDT in their tissues?
  A)
  Algae                                        done clear
  B)
  Copepods done clear
  C)
  Small fish                                  done clear
  D)
  Ospreys done clear
  View Solution play_arrow

• question_answer15)
  Major aerosol pollutant in jet emission is:
  A)
  Sulphur dioxide done clear
  B)
                     Carbon monoxide done clear
  C)
  Methane                                    done clear
  D)
  Fluorocarbon done clear
  View Solution play_arrow

• question_answer16)
  Pollution indicator plants:
  A)
  are resistant to pollution done clear
  B)
  can purify the atmosphere done clear
  C)
  are very sensitive to pollutants done clear
  D)
  can indicate onset of rains done clear
  View Solution play_arrow

• question_answer17)
  Noise pollution is created if noise is in excess to:
  A)
  70-75 dB        done clear
  B)
                     50-60 dB done clear
  C)
  80-99 dB     done clear
  D)
                     40-65 dB done clear
  View Solution play_arrow

• question_answer18)
  Match column-I with column-II and select the correct option.         

  	Column-I		Column-II
  A.	Environment (Protection) Act	I.	1987
  B.	Air (Prevention and Control of Pollution) Act	II.	1986
  C.	Water (Prevention and control of Pollution) Act	III.	1980
  D.	Concept of Joint Forest Management of Govt. of India	IV.	1974

  A)
  A-IV;     B-III;   C-II;    D-I done clear
  B)
  A-II;      B-I;     C-IV;   D-III done clear
  C)
  A-I;       B-II;    C-III;    D-IV done clear
  D)
  A-I;       B-III;   C-II;     D-IV done clear
  View Solution play_arrow

• question_answer19)
  Maintenance of forests in areas with increasing carbon dioxide levels is critical because:
  A)
  forests can serve as carbon dioxide sinks by increasing photosynthesis. done clear
  B)
  the use of carbon dioxide by trees reduces carbon dioxide in the atmosphere. done clear
  C)
  forests are needed to reduce global warming. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer20)
  Effect of pollution is first marked on:
  A)
  Micro-organisms done clear
  B)
  Green vegetation of an area done clear
  C)
  Food crop done clear
  D)
  Mammals done clear
  View Solution play_arrow

• question_answer21)
  The Montreal Protocol refers to:
  A)
  persistent organic pollutants done clear
  B)
  global warming and climate change done clear
  C)
  substances that deplete the ozone layer done clear
  D)
  biosafety of genetically modified organisms done clear
  View Solution play_arrow

• question_answer22)
  Which of the following phenomenon is represented by the given figure?
  A)
  Green-house effect                      done clear
  B)
  El Nino effect done clear
  C)
  Ozone hole                                 done clear
  D)
  Eutrophication done clear
  View Solution play_arrow

• question_answer23)
  Which is a non-degradable pollutant?
  A)
  Smoke done clear
  B)
                     Polythene done clear
  C)
  Copper scraps done clear
  D)
                     Iron scraps done clear
  View Solution play_arrow

• question_answer24)
  Which of the following is not used for disinfection of drinking water?
  A)
  Chlorine                                     done clear
  B)
  Ozone done clear
  C)
  Chloramine    done clear
  D)
                     Phenyl done clear
  View Solution play_arrow

• question_answer25)
  Which of the following is not a major contributor to the current global increase in methane level?
  A)
  Activity of aerobic bacteria in rice paddies. done clear
  B)
  Burning of tropical biomass. done clear
  C)
  Flatulence of herbivorous ruminants. done clear
  D)
  Decomposition of waste in landfill dumps. done clear
  View Solution play_arrow

• question_answer26)
  Which of the following statement (s) is/are correct about noise pollution?
  A)
  It is an undesired high level of sound. done clear
  B)
  It is measured in dB. done clear
  C)
  It can cause damage to heart, increase blood cholesterol and even raise blood pressure etc. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer27)
  'EcoSan' toilets, being used in Kerala and Srilanka are hygienic and cost effective solution to human waste disposal. Mark the correct statement regarding EcoSan.
  A)
  Recycled human waste from this can be used as a natural fertilizer. done clear
  B)
  They are called composting toilets. done clear
  C)
  They do not depend on water for the disposal of excreta. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer28)
  Identify correct statement and choose the option.
  A)
  The major contribution in greenhouse gases is of\[C{{H}_{4}}\]. done clear
  B)
  Global warming is because of ozone depletion. done clear
  C)
  When organic waste enters into a water body its BOD increases. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer29)
  Consider the following statements. Choose the correct option.           

  (i) By the end of twentieth century, the forest cover in India was reduced to 19.4 percent.

  (ii) National Forest Policy was implemented in the year 1988.

  (iii) The average annual production of dry grass or hay in India is about 250 million tons.

  (iv) About 10% of the world's population lives in arid or semi arid regions.

  A)
  (i) and (ii) are true done clear
  B)
  (i), (iii) and (iv) are false done clear
  C)
  (i), (ii), and (iii) are true done clear
  D)
  (iii) is false done clear
  View Solution play_arrow

• question_answer30)
  Frequent occurrence of water blooms in a lakeindicates:
  A)
  Nutrient deficiency. done clear
  B)
  Oxygen deficiency. done clear
  C)
  Excessive nutrient availability. done clear
  D)
  Absence of herbivores in the lake. done clear
  View Solution play_arrow

• question_answer31)
  In cities like Mumbai and Kolkata the major air pollutants are:
  A)
  Ozone done clear
  B)
  CO and oxides of sulphur done clear
  C)
  Hydrocarbons and hot air done clear
  D)
  Algal spores and marsh gas done clear
  View Solution play_arrow

• question_answer32)
  Thermal pollution of water bodies is due to:
  A)
  Discharge of heat (hot water) from power plants. done clear
  B)
  Discharge of chemicals from industries. done clear
  C)
  Discharge of waste from mining. done clear
  D)
  Discharge of agricultural runoff. done clear
  View Solution play_arrow

• question_answer33)
  Gaseous pollutants can be controlled by:
  A)
  Arresters done clear
  B)
  Electrostatic precipitators done clear
  C)
  Pyrolysis done clear
  D)
  Adsorption done clear
  View Solution play_arrow

• question_answer34)
  Which pollutant is absent in automobile exhausts?
  A)
  \[S{{O}_{2}}\]                          done clear
  B)
  Fly ash done clear
  C)
  Hydrocarbon gases                      done clear
  D)
  Nitrogen oxides done clear
  View Solution play_arrow

• question_answer35)
  It is said, the Taj Mahal may be destroyed due to:
  A)
  food in Yamuna river. done clear
  B)
  decomposition of marble as a result of high temperature. done clear
  C)
  air pollutants released from oil refinery of Mathura. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer36)
  Mark the statement that describes the eco- friendly disposal of municipal solid- waste.
  A)
  It should be burnt to completion. . done clear
  B)
  It should be dumped in open waste land. done clear
  C)
  It should be dumped in sanitary landfills. done clear
  D)
  It should be sorted out into bio-degradable, non- biodegradable and recyclable wastes and treated separately. done clear
  View Solution play_arrow

• question_answer37)
  Match Column-1 with Column- II and select the correct answer using the codes given below.

  	Column-I		Column-II
  A.	Nitrous oxide	I.	Secondary pollutant
  B.	Chlorofluorocarbon	II.	Combustion of fossil fuels,
  C.	Methane	III.	Denitrification
  D.	Ozone(\[{{O}_{3}}\])	IV.	Refrigerators
  E.	Carbon dioxide	V.	Cattle, rice field, toilets.

  A)
  A-III;    B- IV;    C- V;    D- I;    E-II done clear
  B)
  A-V;     B- I;      C- III;   D-IV;   E- II done clear
  C)
  A-IV;    B-V;      C-I;      D-II;    E-III done clear
  D)
  A-1;     B-III;      C-IV;   D-V;    E-II done clear
  View Solution play_arrow

• question_answer38)
  Which of the following does not cause pollution?
  A)
  Thermal power project done clear
  B)
  Steel power plant done clear
  C)
  Automobiles done clear
  D)
  Hydroelectric project done clear
  View Solution play_arrow

• question_answer39)
  The enrichment of water by nutrients is:
  A)
  Mineralization done clear
  B)
                     Biomagnification done clear
  C)
  Eutrophication done clear
  D)
                     All of these done clear
  View Solution play_arrow

• question_answer40)
  Non-point source of water pollution is:
  A)
  Sewage outlet' done clear
  B)
  Effluents from a factory done clear
  C)
  Agricultural runoff done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer41)
  Photochemical smog always contains:
  A)
  Aluminum ions done clear
  B)
                     Methane done clear
  C)
  Ozone                                       done clear
  D)
  Phosphorus done clear
  View Solution play_arrow

• question_answer42)
  Match column-I with column-II and select the correct option.      

  	Column-I		Column-II
  A.	Catalytic converter	I.	Particulate matter
  B.	Electrostatic	II.	Carbon monoxide and nitrogen oxides
  C.	Earmuffs	III.	High noise level
  D.	Land fills	IV.	Solid wastes

  A)
  A-I;     B-II;     C-III;   D-IV done clear
  B)
  A-II;    B-I;      C-III;   D-IV done clear
  C)
  A-IV;   B-III;    C-II;    D-I done clear
  D)
  A-III;   B-II;     C-IV;   D-I done clear
  View Solution play_arrow

• question_answer43)
  Lichens are important in the studies on atmosphere pollution because they:
  A)
  can grow in polluted atmosphere done clear
  B)
  can readily multiply in polluted atmosphere done clear
  C)
  efficiently purify the atmosphere done clear
  D)
  are very sensitive to pollutants like sulphur dioxide done clear
  View Solution play_arrow

• question_answer44)
  Carbon monoxide (CO) is harmful to man because:
  A)
  It forms carbolic acid. done clear
  B)
  It generates excess \[C{{O}_{2}}\] done clear
  C)
  It is carcinogenic. done clear
  D)
  It competes with\[{{O}_{2}}\]for haemoglobin. done clear
  View Solution play_arrow

• question_answer45)
  Identify the deleterious effect of deforestation.

  (i) CO, concentration increases.

  (ii) Habitat destruction leading to loss of biodiversity.

  (iii) Disturbance in hydrologic cycle.

  (iv) Desertification.

  Which of the statement given above are correct?

  A)
  (i), (ii) and (iii) done clear
  B)
                     (ii), (iii) and (iv) done clear
  C)
  (i), (iii) and (iv) done clear
  D)
                     (i), (ii), (iii) and (iv) done clear
  View Solution play_arrow

• question_answer46)
  The greatest air pollution disaster during recent years had been witnessed in:
  A)
  Kolkata                                      done clear
  B)
  Ahmedabad done clear
  C)
  Agra                                          done clear
  D)
  Bhopal done clear
  View Solution play_arrow

• question_answer47)
  Which of the following is/are correct regarding Montreal Protocol?

  (i) Persistent organic pollutants.

  (ii) Global warming and climate change.

  (iii) To control the emission of ozone depleting substances.

  (iv) Biosafety of genetically modified organisms.

  A)
  (i) and (iii)     done clear
  B)
                     (iii) only done clear
  C)
  (iii) and (iv)     done clear
  D)
                     (i) and (iii) done clear
  View Solution play_arrow

• question_answer48)
  The sea water gets polluted mainly due to:
  A)
  Industrial waste. done clear
  B)
                     Oil spills. done clear
  C)
  Death of marine fauna done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer49)
  The mine workers are most likely to suffer from:
  A)
  Beri-Beri     done clear
  B)
                     Osteomalacia       done clear
  C)
  Scurvy                                      done clear
  D)
  Xerophthalamia done clear
  View Solution play_arrow

• question_answer50)
  'Sonic booms'refer to:
  A)
  Shock waves   done clear
  B)
                     Noise of traffic done clear
  C)
  Noise of siren   done clear
  D)
                     Nitrates done clear
  View Solution play_arrow

• question_answer51)
  Which among the following is likely to have the highest levels of D.D.T. depositions in its body?
  A)
  Eel                                            done clear
  B)
  Crab done clear
  C)
  Seagull        done clear
  D)
  Phytoplankton done clear
  View Solution play_arrow

• question_answer52)
  Match column-I with column-II and select the correct answer using the codes given below.

  	Column-I		Column-II
  A.	Carbon Monoxide	I.	Qualitative Pollutant
  B.	DDT	II.	Freon
  C.	Chlorofluoro-methane	III.	Lung Cancer
  D.	Smoking	IV.	Quantitative Pollutant
  E.	Acid rain	V.	Nitrogen and Sulphur oxides

  A)
  A-II;     B-I;    C-IV;    D-V;    E-III done clear
  B)
  A-IV;   B-I;    C-II;      D-III;   E-V done clear
  C)
  A-III;    B-II;   C-IV;    D-I;     E-V done clear
  D)
  A-V;    B-III;   C-I;      D-II;    E-IV done clear
  View Solution play_arrow

• question_answer53)
  Which of the following statements about eutrophication are correct?

  (i) It can be a naturally occurring process.

  (ii) It is commonly found in standing rather than running water.

  (iii) It can lead to oxygen depletion.

  (iv) It is commonly associated with high levels of phosphates and nitrates.

  A)
  (iii) and (iv)     done clear
  B)
                     (i), (ii) and (iii) done clear
  C)
  (ii), (iii) and (iv) done clear
  D)
                     All of the above done clear
  View Solution play_arrow

• question_answer54)
  Main air pollutant is:
  A)
  \[C{{O}_{2}}\]                         done clear
  B)
  CO done clear
  C)
  \[{{N}_{2}}\]                            done clear
  D)
  Sulphur done clear
  View Solution play_arrow

• question_answer55)
  The scrubber is used mainly to remove the following gases from the exhaust after spraying water/lime:           
  A)
  \[C{{O}_{2}}\]                         done clear
  B)
  \[S{{O}_{2}}\] done clear
  C)
  \[{{O}_{2}}\,\And \,{{N}_{2}}\]            done clear
  D)
  \[CO\,\And \,C{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer56)
  Which one of the following is a most efficient device to eliminate particulate matters from the industrial emissions?
  A)
  Cyclonic separators done clear
  B)
  Trajectory separators done clear
  C)
  Incineration done clear
  D)
  Electrostatic precipitator done clear
  View Solution play_arrow

• question_answer57)
  Soil fertility can be destroyed by:
  A)
  cutting down forests done clear
  B)
  acid rain done clear
  C)
  overgrazing and overirrigation done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer58)
  Secondary air pollutant is:
  A)
  PAN           done clear
  B)
  CO done clear
  C)
  SO,                                           done clear
  D)
  aerosols done clear
  View Solution play_arrow

• question_answer59)
  The most harmful effect of ionizing radiations precisely involves:
  A)
  Cell membranes done clear
  B)
  DNA done clear
  C)
  Mitochondria and ribosomes done clear
  D)
  Nucleus done clear
  View Solution play_arrow

• question_answer60)
  Among the following environmental pollutants, which one is concerned with biological amplification?            
  A)
  \[S{{O}_{2}}\]                          done clear
  B)
  \[{{O}_{3}}\,and\,C{{O}_{2}}\] done clear
  C)
  Hg and fungicides                       done clear
  D)
  \[N{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer61)
  The amount of freshwater of the earth frozen as polar or glacial ice is:
  A)
  0.5%                                         done clear
  B)
  0.02% done clear
  C)
  0.01%                                       done clear
  D)
  1.97% done clear
  View Solution play_arrow

• question_answer62)
  Which one has the least greenhouse effect?
  A)
  Carbon dioxide done clear
  B)
                     Nitrogen gas done clear
  C)
  Water vapours                            done clear
  D)
  Ozone done clear
  View Solution play_arrow

• question_answer63)
  If global warming continues, the organism which may face more severe threat is:
  A)
  Cow                                          done clear
  B)
  Dog done clear
  C)
  Snow leopard   done clear
  D)
                     Dolphin done clear
  View Solution play_arrow

• question_answer64)
  All organic substance found in the biosphere necessarily contain:
  A)
  Silica                                         done clear
  B)
  Carbon done clear
  C)
  Oxygen                                     done clear
  D)
  Nitrogen done clear
  View Solution play_arrow

• question_answer65)
  Which one of the following is an environment related disorder with the correct main cause?
  A)
  Black lung disease (pneumoconiosis) found mainly in workers in stone quarries and crushers. done clear
  B)
  Blue baby disease (methaemoglobinaemia) due to heavy use of nitrogenous fertilizers in the area. done clear
  C)
  Non-hodgkin's lymphoma found mainly in workers involved in manufacture of neem based pesticides. done clear
  D)
  Skin cancer mainly in people exposed to benzene and methane. done clear
  View Solution play_arrow

• question_answer66)
  Fishes die by sewage because:
  A)
  Of its bad smell. done clear
  B)
  It replaces food material of fishes. done clear
  C)
  It increases oxygen competition among fishes. done clear
  D)
  \[C{{O}_{2}}\] is mixed in large amount in water. done clear
  View Solution play_arrow

• question_answer67)
  Water pollution can be stopped best by:
  A)
  Treating effluents to remove injurious chemicals. done clear
  B)
  Rearing more fishes. done clear
  C)
  Cultivating useful water plants. done clear
  D)
  Spraying with DDT. done clear
  View Solution play_arrow

• question_answer68)
  Industrial waste containing non-biodegradable substance left in a pool of water and a person eating a fish of that water, showing signs of toxicity is a typical example of: JH Critical
  A)
  biological multiplication. done clear
  B)
  biological magnification. done clear
  C)
  accidental care of toxicity. done clear
  D)
  not fish but the person showing toxic effect. done clear
  View Solution play_arrow

• question_answer69)
  The automobile emission can be reduced by adding the following in the petrol:
  A)
  Calcium salts   done clear
  B)
                     Cobalt salts done clear
  C)
  Silicon oil                                   done clear
  D)
  Barium salts done clear
  View Solution play_arrow

• question_answer70)
  Heavy metals are detoxified in plants by:
  A)
  ABA                                         done clear
  B)
  Allelopathins done clear
  C)
  Phytochelatins done clear
  D)
                     Phytoalexins done clear
  View Solution play_arrow

• question_answer71)
  In B.O.D. test, oxygen plays an important role to:                         
  A)
  Destroy inorganic matter. done clear
  B)
  Destroy pollution. done clear
  C)
  Destroy waste organic matter. done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer72)
  Two lakes, A and B are identical in all aspects except that lake A has higher temperature. Which of the following is true?
  A)
  A has higher rate of oxygen dissolution done clear
  B)
  B has higher rate of oxygen dissolution done clear
  C)
  Oxygen dissolution of both is the same done clear
  D)
  Both have same BOD done clear
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• question_answer73)
  Blue baby syndrome is due to:
  A)
  Mercury in drinking water. done clear
  B)
  Excess of nitrates in drinking water. done clear
  C)
  Cd-poisoning. done clear
  D)
  As-poisoning. done clear
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• question_answer74)
  Which of the following strategy is incorrect approach to reduce global warming?
  A)
  Reducing the greenhouse gas emission by limiting the use of fossil fuels. done clear
  B)
  Increase the vegetation cover particularly the forest for photosynthetic utilization of\[C{{O}_{2}}\]. done clear
  C)
  Minimizing the use of nitrogen fertilizers in agriculture for reducing\[N{{O}_{2}}\]emission. done clear
  D)
  Increasing the use of air conditioners, refrigeration unit and production of plastic foams and propellants in aerosal spray cans. done clear
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• question_answer75)
  The antiknock agent added to unleaded petrol is:
  A)
  Tetraethyllead done clear
  B)
  Tetramethyllead done clear
  C)
  Dibromoethane done clear
  D)
  Methyltertiary butyl ether done clear
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• question_answer76)
  Deforestration has caused:
  A)
  more floods and decrease of temperature. done clear
  B)
  more drought and decrease of temperature. done clear
  C)
  shortage of food products. done clear
  D)
  soil erosion and loss of wildlife. done clear
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• question_answer77)
  Prolonged water logging in an agricultural fields is likely to create the problem of:
  A)
  poor aeration and low salinity done clear
  B)
  poor aeration and high salinity done clear
  C)
  poor aeration and high acidity done clear
  D)
  metal toxicity and proper aeration done clear
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• question_answer78)
  Secondary treatment of sewage is:
  A)
  biological degradation of organic material by microorganisms under controlled conditions. done clear
  B)
  chlorination to kill pathogenic microbes. done clear
  C)
  separation of heavy metals from sewage. done clear
  D)
  sedimentation of heavy particles. done clear
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• question_answer79)
  Agenda-21 was adopted in:
  A)
  Kyoto protocol    done clear
  B)
                     Earth summit done clear
  C)
  Helsinki declaration                     done clear
  D)
  Montreal protocol done clear
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• question_answer80)
  So-called greenhouse gases have been given this name because they:
  A)
  trap the heat radiated from Earth's surface. done clear
  B)
  are produced by plants. done clear
  C)
  are necessary for plant growth. done clear
  D)
  are similar to gases produced in a greenhouse done clear
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