19267.In an area where DDT had been used extensively, the population of birds declined significantly because
Cobras were feeding exclusively on birds
Many of the birds eggs laid, did not hatch
Birds stopped laying eggs
Earthworms in the area got eradicated
19268.Biochemical Oxygen Demand (BOD) in a river water
Increases when sewage gets mixed with river water
Remains unchanged when algal bloom occurs
Has no relationship with concentration of oxygen in the water
Gives a measure of salmonella in the water
19269.Montreal Protocol aims at
Control of CO2 emission
Reduction of ozone depleting substances
Biodiversity conservation
Control of water pollution
19270.dB is a standard abbreviation used for the quantitative expression of
The dominant Bacillus in a culture
The density of bacteria in a medium
A certain pesticide
A particular pollutant
19271.Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of :
Calmodulin
Mg ATPase
Ca ATPase
None of these