Which of the following is major radioactive indoor air pollutant in home air conditioner?
Cs
U
Sr
Rn
D.
Rn
Radon is a colourless gas. It is a primary source of indoor air pollution, along with decay products that can attach to dust and airborne particles, producing alpha and beta radiation that damages DNA and causes lung cancer.
Smog is due to
Air pollution derived from smoke and vehicles
More moisture in environment
Increase in CO2
Low temperature of earth surface
Earth is active planet and have phenomenon like volcano, earthquake and continental drift. The major source for continental drift is:
Moon gravity
Earth gravity
Radioactivity in core of earth
Energy from sun
Which of the following is not a direct consequence of greenhouse effect?
Increase in sea level
Rainfall
Tsunami
Global warming
If the atmospheric concentration of carbon dioxide is doubled and there are favourable conditions of water, nutrients, light and temperature, what would happen to water requirement of plants?
It decrease initially for short time and then return to original value
It increases
It decreases
It increases initally for short time and then return to orginal value.
The graph represents the depth profile of temperature in the open ocean; in which region this is likely to be prevalent?
Topical region
Equatorial region
Polar region
Sub-tropical region
High Biological Oxygen demand in water body indicates
Chemical pollution
Organic pollutant
High photoautotroph
Pressure of heterotrophs
Popular use of which of the following fertilizers increase the acidity of soil?
Potassium nitrate
Ammonium sulphate
Urea
Superphoshate of lime
A much greater proportion of energy fixed by autotrophs is transferred to the herbivore level in the open ocean ecosystem than in forest ecosystem because
Aquatic autotrophs are small
Aquatic herbivores are more efficient feeders
Terrestrial autotrophs are less efficient feeders
Terrestrial autotrophs have more indigestible tissues
