An increase in carbondioxide content in the atmosphere would not cause
more heat to be retained by the environment
increase in photosynthesis in plants
global warming
abundance of desert plants
The nitrogen molecules present in air can be converted into nitrates and nitrites by
a biological process of nitrogen fixing bacteria present in soil
a biological process of carbon fixing factor present in soil
any of the industries manufacturing nitrogenous compounds
the plants used as cereal crops in field
Water harvesting is
collection of river water
collection of rainwater in storage tanks or in the soil to recharge ground water
harvesting of water from tube wells
all of the above
All of earth's water, land and atmosphere, within which life exists is known as
a population
a community
a biome
the biosphere
The process of converting atmospheric nitrogen into nitrate is called
Nitrogen fixation
Nitrogenation
Nitrification
Denitrification
Which of the following gases is a CFC that is used in the refrigerators?
Carbon dioxide
Freon
Methane
Ammonia
Over the last 100 years global sea level has risen by about
20-25cm
10-12.5cm
25-50cm
15-30cm
The process of nitrogen-fixation by bacteria does not take place in the presence of
molecular form of hydrogen
elemental form of oxygen
water
elemental form of nitrogen
Water that moves over the surfce of the ground into lakes ad rivers is called
ground water
a water table
run - off
the water cycle
The process in which water vapour changes to a liquid is called
condensation
evaporation
transpiration
precipitation
