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
A.
CO2 and CH4
The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of earth's surface and atmosphere. Clouds and gases reflect about one-fourth of the incoming solar radiation and absorb some of it but almost half of incoming solar radiation falls on earth's surface heating it , while a small proportion is reflected back. Earth's surface reemits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (eg CO2, CH4 etc) absorb a major fraction of it. The molecules of these gases radiate heat energy and a major part of which again comes to earth's surface thus heating it up once again CO2 (60%) and CH4 (20%) are commonly known as greenhouse gases because t hey are responsible for the greenhouse effect, that ultimately leads to global warming.
Modern detergents contain enzyme preparations of
acidophiles
alkaliphiles
thermoacidophiles
thermoacidophiles
Montreal protocol aims at
reduction of ozone depleting substances
biodiversity conservation
control of water pollution
control of water pollution
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
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
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
Which one of the following is not used in organic farming?
Glomus
Earthworm
Oscillatoria
Oscillatoria
