Indicator of water pollution:
1.  E. Coli
2.  Chlorella
3.  Beggiatoa
4.  Ulothrix

If $C{O}_2$ is absent in the atmosphere of the earth, then:
1.  Temperature will decrease
2.  Temperature will increase
3.  Plants will flourish well
4.  No effect

Besides CH₄ and CO₂, another green house gas is:
1.   SO₂
2.   NH₃
3.   N₂O
4.   CFC 

Temperature variation in Pacific ocean in present time is called:
1.  Cyclone effect
2.  El Nino effect
3.  Greenhouse effect
4.  Gaudikov's effect

Sewage purification is performed by:
1.  Microbes
2.  Fertilisers
3.  Antibiotics
4.  Antiseptics

Most stable pesticides:
1.  Organophosphates
2.  Organochlorines
3.  Bordeaux mixture
4.  Azaderectnin

Best economic method to harvest solar energy:
1.  Solar cell
2.  Energy plantation
3.  Cultivation of sugar cane then energy obtain by burning it
4.  Solar cooker

Bhopal gas tragedy is related to:
1.  Methane
2.  Carbon monoxide
3.  Methyl Isocyanate (MIC)
4.  $S{O}_2$

Concentration of DDT is highest in:
1.  Primary consumer
2.  Producers
3.  Top consumer
4.  Decomposers

Which of the following is a secondary pollutant:
1. PAN
2. CO
3. $N{O}_2$
4. $S{O}_2$