Biological Oxygen Demand (BOD) is a measure of
(a) industrial wastes poured into water bodies
(b) extent to which water is polluted with organic compounds
(c) amount of carbon monoxide inseparably
(d) amount of oxygen needed by green plants during night.
Drinking of mineral water with very low level of pesticides (about 0.02 ppm) for long periods may :-
(a) produce immunity against mosquito
(b) cause leukemia (blood cancer) in most people
(c) cause cancer of the intestine
(d) lead to accumulation of pesticide residues in body fat
Photochemical smog formed in congested metropolitan cities mainly consists of
(a) ozone, peroxyacetyl nitrate and NOx
(b) smoke, peroxyacetyl nitrate and SO2
(c) hydrocarbons, SO2 and CO2
(d) hydrocarbons, ozone and SOx.
In almost all Indian metropolitan citiies like Delhi, the major atmospheric pollutant(s) is/are:
(a) suspended particular matter (SPM)
(b) oxides of suplhur
(c) carbon dioxide and carbon monoxide
(d) oxides of nitrogen.
Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine air borne particles which lead to
(a) photochemical smog
(b) dry acid deposition
(c) industrial smog
(d) wet acid deposition
A lake with an inflow of domestic sewage rich in organic waste may result in
(a) drying of the lake very soon due to algal bloom
(b) an increased production of fish due to lot of nutreients
(c) death of fish due to lack of oxygen
(d) increased population of aquatic food web organisms.
Minamata disease was caused due to the consumption of
(a) sea food containing lot of cadmium
(b) fish contaminated with mercury
(c) oysters with lot of pesticide
(d) sea food contaminated with selenium.
Formation of non-functional methaemoglobin causes blue-baby syndrome. This is due to
(a) excess of arsenic concentration in drinking water
(b) excess of nitrates in drinking water
(c) deficiency of iron in food
(d) increased methane content in the atmosphere
Which one of the following statement pertaining to pollutants is correct?
(a) DDT is a non-biodegradable pollutant.
(b) Excess fluoride in drinking water causes osteoporosis.
(c) Excess cadmium in drinking water causes black foot disease.
(d) Methylmercury in water may cause "Itai Itai" disease.
Pollution from animal excreta and organic waste from kitchen can be most profitably minimized
(a) storing them in underground storage tanks
(b) using them for producing biogas
(d) using them directly as biofertilizers