Acid rain are produced by:
excess NO2 and SO2 from burning fossil fuels
excess production of NH3 by industry and coal gas
excess release of carbon monoxide by incomplete combustion
excess formation of CO2 by coinbustion and animal respiration
A.
excess NO2 and SO2 from burning fossil fuels
The SO2 and NO2 produced from industries thermal plants and motor vehicles combines with waterin the air and form H2SO4 and HNO3 respectively. These cause acid rain.
A student wants to study metaphasic behaviour of chromosomes in a living cell. The technique most suitable is :
phase contrast microscope
x-ray microscope
cell fractionation
scanning electron microscope
In the life scale of mosquito, comma shaped stage is:
larval stage
pupal stage
imago stage
none of these
Removal of top fertile soil by wind or water is :
Siltation
Soil erosion
Weathering of soil
Leaching
Two or more species occupying same or ovarlapping areas are :
sympatric
sibling
sub species
allopatric