The principal cereal crop of India/Asia is :
Sorghum
barley
wheat
rice
D.
rice
Rice is the principal cereal crop of India/ Asia.
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
In the life scale of mosquito, comma shaped stage is:
larval stage
pupal stage
imago stage
none of these
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
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