19247.Eutrophication causes decrease in
Dissolved hydrogen
Dissolved salts
Dissolved oxygen
All of these
19248.Addition of phosphates and nitrates/fertilizers into water leads to
Increased algal growth
Nutrient enrichment (eutrophication)
Reduced algal growth
Increased growth of decomposers
19249.Ozone depletion in the stratosphere will cause
Increased incidence of skin cancer
Forest tires
Global warming
none of these
19250.Measuring Biochemical Oxygen Demand (BOD) is a method used for
Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale
Working out the efficiency of R.B.Cs. about their capacity to carry oxygen
Estimating the amount of organic matter in sewage water
Working out the efficiency of oil driven automobile engines
19251.Minamata disease is due to pollution of
Industrial waste mercury into fishing water
Oil spill in water
Organic waste into drinking water
Arsenic into the atmosphere
19253.Most harmful environmental pollutants are
Natural nutrients in excess
Human organic wastes
Nonbiodegradable chemicals
Waste animal feed
19254.The atmosphere of big metropolitan cities is polluted most by
Automobile exhausts
Radio-active fall out
Household waste
Pesticides residue
19257.Attack of asthma in certain persons may be due to
Exposure to cold temperature
Inhalation of some air borne pollen
Eating of some seasonal vegetables
Low concentration of CO2 due to increased rate of photosynthesis
19258.Non-Ionizing radiations with specific biological effects are
Gamma rays
Beta-rays
UV radiations
X-rays
19260.A chemical harmful released by Chlorofluorocarbon to ozone is
Nitrogen Peroxide
Fluorine
Chlorine
Sulphur dioxide
19262.Peeling of Ozone umbrella, which protects us from UV rays, is caused by
CFCs
CO2
PAN
Coal burning
19263.Fish die in water polluted by sewage due to
Pathogens
Reduction in O2
Clogging of gills by silt
Foul smell
19264.Ozone layer of upper atmosphere is being destroyed by
Chlorofluorocarbon
Photochemical oxidants
Sulphur dioxide
Smog
19266.Acid rain is caused by increase in the atmospheric concentration of
Ozone and dust
SO2 and NO2
SO3 and CO
CO2 and CO