Which one of the following statements is correct?

1. Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

2. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants

3. Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil

4. At present, it is not possible to grow maize without chemical fertilizers

Which one of the following is being utilized as a source of bio- diesel in the Indian

countryside?

1. Euphorbia

2. Beetroot

3. Sugarcane

4. Pongamia

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S),

distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been

arranged in ascending order ?

1. SE < S < PE < DE

2. SE < PE < S < DE

3. PE < S < SE < DE

4. S< DE < PE < SE

In a coal fired power plant electrostatic precipitators are installed to control emission of:-

1. SO₂ 

2. NO_x

3. SPM

4. CO

Which one of the following is not a bioindicator of water pollution?

1. Sludge-worms

2. Blood-worms

3. Stone flies

4. Sewage fungus

The "blue baby' syndrome results from

1. excess of chloride

2. methaemoglobin

3. excess of dissolved oxygen

4. excess of TDS (Total Dissolved Solids)

Montreal protocol which calls for appropriate action to protect the ozone layer from

human activities was passed in the year:

1. 1986

2. 1987

3. 1988

4. 1985

Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial

and municipal waste water into natural surface water, is

1. < 3.0 ppm

2. < 10 ppm

3. < 100 ppm

4. < 30 ppm

Checking of re-radiating heat by atmospheric CO₂ methane, ozone, dust is known as 

1. green house effect

2. radioactive effect

3. ozone layer

4. solar effect.

Chronic exposure to arsenic causes ?

1. blue-baby syndrome

2. foot and mouth disease

3. dropsy

4. itai-itai disease