A lake near a village suffered heavy mortality of fishes within a few days. Consider the
following reasons for this
(1) Lots of urea and phosphate fertilizer were used in the crops in the vicinity.
(2) The area was sprayed with DDT by an aircraft.
(3) The lake water turned green and stinky.
(4) Phytoplankton populations in the lake declined initially thereby greatly reducing
photosynthesis.
Which two of above were the main causes of fish mortality in the lake?
2, 3
3, 4
1, 3
1, 2
According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometres) of the air pollutants is responsible for greatest harm to human health?
2.5 or less
1.5 or less
1.0 or less
5.2 or 2.5
Which one of the following is being tried in India as a biofuel substitute for fossil fuels?
Jatropha
Azadirachta
Musa
Aegilops
Which one of the following is the correct percentage of the two (out of the total of 4) green-house gases that contribute to the total global warming?
CFCs 14%, CH4 20%
CO2 40%, CFCs 30%
N2O 6%, CO2 86%
CH4 20%, N2O 18%
Which one of the following statemetns is correct?
and potassium for plant nutrition in soil
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
Cyanobacteria such as Anabaena and Nostoc are important mobilizer of phosphates
At present it is not possible to grow maize without chemical fertilizers
Which one of the following is being utilized as a source of bio- diesel in the Indian
countryside?
Euphorbia
Beetroot
Sugarcane
Pongamia
In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S),
distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been
arranged in ascending order ?
SE < S < PE < DE
SE < PE < S < DE
PE < S < SE < DE
S< DE < PE < SE
In a coal fired power plant electrostatic precipitators are installed to control emission of:-
SO2
NOx
SPM
CO
Which one of the following is not a bioindicator of water pollution?
Sludge-worms
Blood-worms
Stone flies
Sewage fungus
The "blue baby' syndrome results from
excess of chloride
methaemoglobin
excess of dissolved oxygen
excess of TDS (Total Dissolved Solids)
Montreal protocol which calls for appropriate action to protect the ozone layer from
human activities was passed in the year:
1986
1987
1988
1985
Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial
and municipal waste water into natural surface water, is
< 3.0 ppm
< 10 ppm
< 100 ppm
< 30 ppm
Checking of re-radiating heat by atmospheric CO2 methane, ozone, dust is known as
green house effect
radioactive effect
ozone layer
solar effect.
Chronic exposure to arsenic causes ?
blue-baby syndrome
foot and mouth disease
dropsy
itai-itai disease
Green muffler is used against which type of pollution ?
Air
Water
Soil
Noise
Biochemical Oxygen Demand (BOD) is a measure of
industrial wastes poured into water bodies
extent to which water is polluted with organic compounds
amount of carbon monoxide inseparably
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 :-
produce immunity against mosquito
cause leukemia (blood cancer) in most people
cause cancer of the intestine
lead to accumulation of pesticide residues in body fat
Photochemical smog formed in congested metropolitan cities mainly consists of
ozone, peroxyacetyl nitrate and NOx
smoke, peroxyacetyl nitrate and SO2
hydrocarbons, SO2 and CO2
hydrocarbons, ozone and SOx.
In almost all Indian metropolitan citiies like Delhi, the major atmospheric pollutant(s)
is/are:
suspended particular matter (SPM)
oxides of suplhur
carbon dioxide and carbon monoxide
oxides of nitrogen.
A lake with an inflow of domestic sewage rich in organic waste may result in
drying of the lake very soon due to algal bloom
an increased production of fish due to lot of nutreients
death of fish due to lack of oxygen
increased population of aquatic food web organisms.
Minamata disease was caused due to the consumption of
sea food containing lot of cadmium
fish contaminated with mercury
oysters with lot of pesticide
sea food contaminated with selenium.
Formation of non-functional methaemoglobin causes blue-baby syndrome. This is due to
excess of nitrates in drinking water
deficiency of iron in food
increased methane content in the atmosphere
Which one of the following statement pertaining to pollutants is correct?
Excess fluoride in drinking water causes osteoporosis.
Excess cadmium in drinking water causes black foot disease.
Methylmercury in water may cause "Itai Itai" disease.
Pollution from animal excreta and organic waste from kitchen can be most profitably minimized
using them for producing biogas
vermiculture
using them directly as biofertilizers
Which one of the following is an enviroment related disorder with the correct main cause?
Blue baby disease (methaemoglobinaemia) due to heavy use of nitrogenous fertilizers in the area.
Skin cancer mainly in people exposed to benzene and methane.
Both a and b
The Montreal Protocol refers to
global warming and climate change
substances that deplete the ozone layer
biosafety of genetically modified organisms.
Ozone in stratosphere extends
() 20-25 km
() 15-30 km
() 25-40 km.
Rain is called acid-rain when its pH is below
6.5
6
5.6.
In vehicles, catalytic converters are used
to increase mileage of vehicles
to convert CO2 into carbonates
to increase the efficiency of lead mixed petrol
to convert CO to CO2.
Which of the following statements is correct ?
Histones are acidic in nature that forms core for DNA packaging
Lactobacillus is not present in dough used in idli formation.
Template with polarity 5' →3' has continuous DNA replication.
Please disable the adBlock and continue. Thank you.
