Biomagnification is the increasing concentration of a substance such as a toxic chemical in the tissues of organisms at successively higher levels in a food chain.
Electrostatic precipitator can remove over 99% particulate matter present in the exhaust from a thermal power plant.
Catalytic converters are fitted into automobiles for reducing emission of poisonous gases.
The same diesel engine cannot be used in CNG buses.
CNG burns more efficiently than diesel, is cheaper, and cannot be adulterated.
The thickness of the ozone in a column of air from the ground to the top of atmosphere is measured in term of Dobson unit (1 DU = 1ppb).
UV-B radiations damage DNA and mutations may occur.
In human eye, cornea absorbs UV-B radiations, and a high dose of UV-B causes inflammation of cornea called snow blindness, cataract, etc.
Montreal protocol was signed on 16 Sep 1987 aimed at stopping the production and import of ODS and reduce their concentration in the atmosphere.
In majority of aquatic plants, the flowers emerge above the level of water.
These may be pollinated by insects or wind e.g.: Water hyacinth and water lily.
It is recommended that nuclear wastes should be stored after pre-treatment in suitable containers, which should then be buried in rocks.
Eutrophication is a process where water bodies receive excess nutrients that stimulate excessive plant growth (algae, phytoplankton, and nuisance plants weeds).
Nitrates and phosphates are two essential nutrients that can cause eutrophication when they are present in large amounts.
If a lake is contaminated with polluted water that has high BOD, bacteria consume oxygen during decomposition of organic matter.
This leads to a decrease in the amount of dissolved oxygen (DO) in the water.
