UPSC CIVIL SERVICES RESULT 2015-2016

ENVIRONMENTAL ISSUES- BIOLOGY–GENERAL SCIENCE NOTES FOR IAS

                                         ENVIRONMENTAL ISSUES

             BIOLOGY –GENERAL SCIENCE NOTES FOR IAS
ENVIRONMENTAL ISSUES-CLASS12 NCERT/CBSE CHAPTER 16

Pollution                                                                                                                            
Pollution is defined as any undesirable change in the physical, chemical and biological characteristics of air, water and soil that adversely affects the living organisms.
ENVIRONMENTAL ISSUES,CLASS12 NCERT/CBSE CHAPTER 16,GENERAL SCIENCE NOTES FOR IAS,IPS UPSC,NCERT,CBSE,WATER POLLUTION,POLLUTION
CLASSIFICATION OF WATER POLLUTANTS(CLICK ON IMAGE TO ENLARGE)

Pollutants                                                                                                                           
Pollutants are those substances/agents which bring about undesirable changes in the properties of air, water, soil, that affect the living organisms.












Noise                                                                                                                                  
Noise is undesirable high level of sounds.

Biological/Biochemical Oxygen Demand (BOD)                                                          
Biological oxygen demand is the measure of oxygen required by aerobic decomposers for the biochemical degradation of biodegradable organic wastes.

Non-Biodegradable Pollutants                                                                                        
These Pollutants/substances which cannot be broken into simpler and harmless substances by the action of decomposers/microbes are called non-biodegradable pollutants.

Biodegradable Pollutants                                                                                                 
Those pollutants /substances which can be broken into simpler and harmless substances by the action of decomposers/microbes, are called biodegradable Pollutant.

Eutrophication                                                                                                                   
 Eutrophication refers to the nutrient enrichment in the water bodies leading to lack of oxygen and deadening of life-supporting environment.

Algal Bloom                                                                                                                        
The excess /profuse proliferation of planktonic algae imparting distinct colours to the water is called algal bloom.

Biological Magnification                                                                                                 
Biological magnification is the phenomenon in which harmful chemicals/pollutants get accumulated in the tissues of organisms in increasing concentrations, as they travel along the food chain.

Electronic Wastes (e-wastes)                                                                                           
Irreparable computers and other electronic goods, are known as electronic wastes.

Green House Effect                                                                                                           
Green House Effect is a naturally occurring phenomenon, in which the shortwave radiations are absorbed and the long wave radiations are reflected by the earth and is responsible for heating of earth’s surface and atmosphere.

Global Warming                                                                                                              
The increase in the global mean temperature, is known as global warming.

Polar Vortex                                                                                                                     
Polar vortex refers to the natural circulation of wind that completely isolates the Antarctic air from the rest of the world.

Snow blindness                                                                                                                 
The inflammation of cornea caused by a high dose of UV-B is known as snow-blindness

Ozone-Hole                                                                                                                     
The decline in the thickness of spring time ozone layer , is called ozone hole.

Deforestation                                                                                                                   
Deforestation is the conversion of forested areas into non-forested ones.

Reforestation                                                                                                                     
Reforestation is the process of restoring a forest, that once existed, but was removed at some point of time in the past.





Print Friendly and PDF

No comments:

Civilservicesias.com Posting Guidelines

We offer users the ability to comment on news items and also engage in discussions in our message board
The following types of posts may be deleted:

1.Use of offensive racial / gender /religion-bashing terms or other hurtful speech.
2.Spam and links to spam.We may remove hyperlinks within comments.
3.Personal attacks on other posters.Comment on ideas, not people.