[PPSC Deputy Director, 2020]
36. The excessive growth of the micro and macro planktons in the water body interrupts the growth of other components of the ecosystem.
Which of the following processes has such features?
Succession
Eutrophication
Interruption
None of the above
37. Global agreement in specific control strategies to reduce the release of ozone depleting substance
Rio de Janeiro conference
Montreal Protocol
Kyoto Protocol
Vienna Convention
38. Some possible properties of modern insecticides are listed below. When these insecticides are used, which property helps to keep environmental pollution at the lowestn level ?
Accumulates in the bodies of Predators
Broken down by soil bacteria
Easily washed into lakes and rivers
Taken up by the plants roots
39. Acid rain is formed due to contribution from the following pairs of gases
Methane and Ozone
Oxygen and Nitrous oxide
Methane and Sulphur dioxide
Nitrogen oxides and Sulphur dioxide
40. Which one of the following is not used to disinfect treated waste water ready to be released in natural waterways ?
Chlorine gas
Ammonia
Ultraviolet light
Ozone