1. What products result from imperfect combustion, how do they affect people? 2. In which two ways can exhaust from automobiles be treated to minimise air pollution? 3. How does excessive use of...

1. What products result from imperfect combustion, how do they affect people?

2. In which two ways can exhaust from automobiles be treated to minimise air pollution?

3. How does excessive use of fertilisers pollute water and make it unfit for use?

4. In what way does oil as a pollutant harmfully affect the environment?

5. How does toxicity due to lead present in potable water occur?