A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this
(1) lost of urea and phosphate fertiliser 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 were two of above the main causes of fish mortality in the lake?
2, 3
3, 4
1,3
1,3
Steps taken by the Government of India to control air pollution include
compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel
Compulsory PUC (pollution Under control) certification of petrol driven vehicles, which tests for carbon monoxide and hydrocarbons
permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles
permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles
Which one of the following is not used in organic farming?
Glomus
Earthworm
Oscillatoria
Oscillatoria
Modern detergents contain enzyme preparations of
acidophiles
alkaliphiles
thermoacidophiles
thermoacidophiles
dB is a standard abbreviation used for the quantitative expression of
the density of bacteria in a medium
a particular pollutant
the dominant Bacillus in a culture
the dominant Bacillus in a culture
Global agreement on specific control strategies to reduce the release of ozone depleting substance was adopted by
Rio de Janerio Conference
The Montreal protocol
The koyoto protocol
The koyoto protocol
The two gases making highest relative contribution to the green house gases are
CO2 and CH4
CH4 and NO2
CFCs and N2O
CFCs and N2O
Montreal protocol aims at
reduction of ozone depleting substances
biodiversity conservation
control of water pollution
control of water pollution
