Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste water into natural surface water is:
< 3.0 ppm
< 10 ppm
< 100 ppm
< 30ppm
A high density of elephant population in an area can result in:
Mutualism
Intraspecific competition
Interspecific competition
Predation on one another
Which one of the following pair is mismatched?
Biomass burning - Release of CO2
Fossil fuel burning - Release of CO2
Nuclear power - Radioactive wastes
Solar energy - Green house effect
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of:
Xerophytes
Mesophytes
Epiphytes
Hydrophytes
There is no life on moon due to absence of
O2
water
light
temperature
Photochemical smog pollution does not contain:
Ozone
Nitrogen dioxide
Carbon dioxide
PAN (Peroxy Acyl Nitrate )
Which one of the following is the correct percentage of the two (out of the total of 4 ) green - house gases that contribute to the total global warming ?
CFCs- 14%, CH4- 20%
CO2- 40% , CFCs- 30%
N2O- 6% , CO2- 86 %
CH4- 20% , N2O-18%
What is the intensity of sound in normal conversation ?
10-20dB
30-60dB
70-90dB
120-150dB
Which of the following ecosystem types has the highest annual net primary productivity ?
Tropical rain forest
Tropical deciduous forest
Temperate evergreen forest
Temperate deciduous forest
Praying mantis is a good example of:
Mullerian mimicry
Warning colouration
Social insects
Camouflage
