Ozone can be destroyed by a number of free radical catalysts; the most important are:
I. OH^-
II. NO^-
III. Cl^-
IV. Br^-

Of these, human activity has drastically increased the levels of:
1. Only III
2. Only III and IV
3. Only I and II
4. I, II, III and IV

Limit of BOD prescribed by Central Pollution Control Board for discharge of industrial and municipalwaste waters into natural surface waters is
1. < 3.0 ppm
2. < 10 ppm
3. < 30 ppm
4. < 100 ppm

“Greenpeace” is a non-governmental environmental organization with headquarters in:
1. Geneva, Switzerland
2. Paris, France
3. Amsterdam, Netherlands
4. Nuuk, Greenland

A water body has low DO content. An organism that is likely to flourish here will be:
1. Gonyaulax, an annelid
2. Gonyaulax, a nematode
3. Tubifex, an annelid
4. Tubifex, a nematode

In which one of the following the BOD (Biochemical oxygen demand) of sewage (s), distellary effluent(DE), paper mill effluent (PE) and sugarmill effluent (SE) have been arranged in ascending order.
1. SE < PE < S < DE
2. PE < S < SE < DE
3. S < DE < PE < SE
4. SE < S < PE < DE

A painful bone condition is produced when the drinking water is contaminated with:
1. Lead
2. Mercury
3. Cadmium
4. Arsenic

The COP 26 is scheduled to be held in:
1. Brazil
2. Chile
3. Spain
4. United Kingdom

Rachel Carson's famous book "Silent Spring" is related to :
1. Noise pollution
2. Population explosion
3. Ecosystem management
4. Pesticide pollution

Bhopal gas tragedy of 1984 took place because methyl isocyanate reacted with
1. DDT
2. Ammonia
3. ${\mathrm{CO}}_2$
4. Water

Identify the incorrectly matched pair: