Causes of Pollution Biology Multiple Choice Questions (MCQ) PDF Download

MCQ : Lives of organisms in ecosystem become threatened due to

1. urbanization
2. industrialization
3. introduction of toxics in ecosystem
4. rapid housing

MCQ 1: Reaction between oxides of nitrogen (N₂) and oxygen (O₂) results in

1. formation of nitric acid only
2. acid rains only
3. alkali rain
4. formation of nitric acid and acid rains

MCQ 2: Incomplete burning of fuel causes

1. decrease in annual rain fall
2. decay of fossil fuels
3. rapid sheet erosion
4. pollution

MCQ 3: Process by which harmful substances are added to environment is called as

1. Silting
2. Pollution
3. Desertification
4. Flooding

MCQ 4: Reaction between sulfur dioxide and oxygen results in

1. sulfuric acid only
2. acid rain only
3. alkali rain
4. sulfuric acid and acid rain