Which one of the following statement pertaining to pollutants is correct?
(1) DDT is a non-biodegradable pollutant.

(2) Excess fluoride in drinking water causes osteoporosis.

(3) Excess cadmium in drinking water causes black foot disease.

(4) Methylmercury in water may cause "Itai Itai" disease.

Pollution from animal excreta and organic waste from kitchen can be most profitably minimized
(1) storing them in underground storage tanks

(2) using them for producing biogas

(3) vermiculture

(4) using them directly as biofertilizers

Which one of the following is an enviroment related disorder with the correct main cause?
(1) Black lung disease (pneumoconiosis) found mainly in workers in stone quarries and crushers.

(2) Blue baby disease (methaemoglobinaemia) due to heavy use of nitrogenous fertilizers in the area.

(3) Skin cancer mainly in people exposed to benzene and methane.

(4) Both a and b 

The Montreal Protocol refers to
(1) persistent organic pollutants

(2) global warming and climate change

(3) substances that deplete the ozone layer

(4) biosafety of genetically modified organisms.

Ozone in stratosphere extends
(a) 10-20 km

(b) 20-25 km

(c) 15-30 km

(d) 25-40 km.

Rain is called acid-rain when its pH is below
(1) 7

(2) 6.5

(3) 6

(4) 5.6.

In vehicles, catalytic converters are used

(1) to increase mileage of vehicles

(2) to convert CO₂ into carbonates

(3) to increase the efficiency of lead mixed petrol

(4) to convert CO to CO₂.

Which of the following statements is correct ?
(1) Electrostatic precipitator can separate particulate matter of diameter less than 2.5 micrometers.

(2) Histones are acidic in nature that forms core for DNA packaging

(3) Lactobacillus is not present in dough used in idli formation.

(4) Template with polarity 5' $\to$3' has continuous DNA replication.

Cattle ranches are known to causes acute green house effect. This is due to
(1) mechanized milking practices

(2) methanogenic bacteria in rumen

(3) decomposition of left over fodder

(4) decomposition of organic remains in faeces.

Select the correct statement.

(1) Particulate matter of size 10 μm can create severe damage to the lungs.

(2) Particulate matter of size greater than 2.5 $\mathrm{\mu }$m can get trapped in lungs and cause problems.

(3) Particulate matter of size less than 2.5 μm penetrate deep into lungs.

(4) None of the above.