41.
Which of the following appeared to be with a significant potential for accumulation through food chains ?

42.
Higher concentration of nitrogen dioxide in atmosphere air causes

43.
Which of the following in automobile exhaust can cause cancer?

44.
White lung cancer is caused by

45.
Which of the following is a man-made source of air pollution ?

46.
Oxide of sulphur present in the atmosphere are washed down by rains to cause :

47.
Supersonic jet causes pollution by thinning of

48.
The pollutant responsible for ozone holes is ________

49.
Major gaseous pollutant of the thermal power station is

50.
The gas causing acid rain in an industrial area is