UPSC Environment questions with explantions
Q. The most common substance responsible for pollution is
(a) Smoke
(b) Carbon dioxide
(c) Sulphur dioxide
(d) Carbon monoxide
Correct Answer: (a) Smoke
Explanation
Smoke is one of the most common substances responsible for air pollution. It consists of a mixture of gases and fine particles released mainly from the burning of fuels such as coal, wood, oil, and other organic materials.
Q. Which one of the following is a fast growing tree ?
(a) Teak
(b) Eucalyptus
(c) Banyan
(d) Coconut
Correct answer: (b) Eucalyptus
Explanation (Short):
Eucalyptus trees are known for their very rapid growth rate. They can grow much faster compared to trees like Teak, Banyan, or Coconut.