Which of the following processes is involved in the water cycle?
Evaporation, hibernation and dehydration
Evaporation, condensation and precipitation
Paddling, swimming and drinking
Bathing, sunning and drinking
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
The largest reservoir of carbon is the
soil
atmosphere
ocean
sedimentary rocks
Which of the following element's oxides contribute to acid rains?
silicon
sodium
oxygen
carbon
The way in which carbon is used and reused through the ecosystem is called
energy recycling
the energy pyramid
the biotic / abiotic cycle
the carbon cycle
Low visibility during cold weather is due to
formation of fossil fuel
unburnt carbon particles or hydrocarbons suspended in air
lack of adequate power supply
none of these
What minerals are found in the run off from agricultural land and untreated sewage effluents that are responsible for eutrophication of water bodies?
phosphorous and carbon
nitrogen and phosphorus
potassium nad arsenic
iron and manganese
Which of the following pollutants is not present in the vehicular exhaust emissions?
Lead
Ammonia
Carbon monoxide
Particulate matter
Over the last 100 years global sea level has risen by about
20-25cm
10-12.5cm
25-50cm
15-30cm
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?
It moves along with oxygen into the cells
It comes out with the CO2 during exhalation
It is absorbed only by the nasal cells
Nitrogen concentration is already more in the cells so it is not at all absorbed.
