12th Zoology

Prevention and Effect of Ozone depletions

Prevention and Effect of Ozone depletions

Effect of Ozone depletions

If the ozone is depleted more ultraviolet radiations (especially
ultraviolet B (UVB) will reach the earths surface.

Effect on plants:- will affect crop yield and forest productivity.

Effect on animals:- will cause damage to fish larvae and other small

Effect on human health:- Results in non-melanoma skin cancer and
melanoma, acute erythem a (sun burn), ocular abnormalities, cataract, affect
immune responses.

The general effect of ozone depletion is summed up in the following chart (Effect of Ozone depletions)

Preventing ozone depletion:

1. CFC’s (Chloro Fluro Carbons) should be replaced by HCFC’s (Hydro
Chloro Fluro Carbons). (If over used could damage ozone), HFC’s (Hydro
Flouro Carbons), Hydrocarbons such as butane and propane. (but flammable
and poisonous), Ammonia (must be handled carefully), Water and

2. Production, use and emission of ozone – depleting chemicals should be

3. Recycling of these chemicals should be increased.

4. Servicing of refrigerators and air-conditioners should be regulated.

5. Refrigirants should be recaptured and used.

6. Adopt protection measures from sun’s radiation. (Effect of Ozone depletions)

Monitoring Ozone depletion

In early eighties scientists reported a large hole in the ozone
layers over Antarctica, where ozone level dropped by 30 percent. CFC
was the prime suspect for causing ozone depletion.
· Subsequently a similar hole was discovered over the thickly
populated northern hemispheres(North Europe and USA).
· An international agreement made in 1987 at Montreal organized
by 34 countries (Montreal Protocol) called for reduction in the
usage of CFC up to 50% by the end of the century.
· In June 1992 Japanese scientists announced that the ozone
hole was 13 times wider in 1991, than it had been in 1981.
· In 1990, at London conference the developed countries agreed
to 100 percent ban of CFCs by 2000 A.D.
· In 1991-1992, Scientists working in European Arctic stratosphere
Ozone experiment in Sweden sent 39 balloons with payload up to
500 kg and 800 ozone probes. Their findings revealed that ozone layer
was reduced by 15-20 percent. Chlorine was also found in active form in
the atmosphere. (Effect of Ozone depletions)

Related Topics in Zoology:

Bio Zoology All Important Topics

  1. Human population and explosion

  2. Population Explosion

  3. Growing Population and Environmental impacts

  4. Global warming – Green house effect

  5. Ozone layer depletion

  6. Prevention and Effect of Ozone depletions

  7. Waste management – Classification

  8. Management of hazardous wastes

  9. Management of non hazardous wastes

  10. Waste water treatment and management

  11. Biodiversity

  12. Conservation of Biodiversity

  13. Characteristics of a Bioreserve

  14. Energy crisis and its environmental impact

  15. Steps to be taken to resolve energy crisis

  16. Environmental impacts of Power Sources

  17. Poverty and environment

  18. Fresh water crisis and management

Unit 6. APPLIED BIOLOGY Topic List Zoology

  1. Livestock and Management

  2. Important cattle breeds and their characteristics

  3. Milch breeds (or) Dairy breeds

  4. Dual purpose breeds & Draught breeds

  5. Exotic breeds of cattle

  6. Common diseases and control in Cattle – Contagious diseases

  7. Non-contagious diseases – Cattle

  8. Techniques adopted in cattle breeding

  9. Poultry Breeds

  10. Farming methods

  11. Poultry byproducts

  12. Fish Pond

  13. Edible Fishes Of Tamilnadu

  14. Medical Lab Techniques – Stethoscope

  15. Sphygmomanometer

  16. Haemocytometer

  17. Urine Sugar analysis

  18. ECG Electrocardiogram

  19. Computed Tomography CT

  20. Endoscopy (Laproscopy) techniques , Artificial Pacemaker

  21. Autoanalyser

Leave a Reply

Your email address will not be published. Required fields are marked *