Question

a group of 20 students of class XII went to a nearby village they observed that there is a lot of difference in the the environment of rural and urban area.In urban area,there is a lot of popultion.people are suffering from cough, typhoid and skin diseases but in rural area people are healthy .There are a large number of trees in rural area therefore evironment is clean.
i) what are the main reasons of air pollutants?
ii) what are primary and secondary pollutents?
iii) name two water borne diseases.
iv) what is global warning?
V) why is it advisable to switch off engine of vehicale at red light ?
vi) what is photochemical smog?

Answer 1

A. the main reasons of air pollution is throwing of waste which spoils and makes a very poor and unacceptable smell which causes diseases.
B. A primary pollutant is an air pollutant emitted directly from a source.

A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.

C. Cholera, typhoid and dysentery.
D. Global warming is a long-term rise in the average temperature of the Earth's climate system.
E. Because it could help in our sustainable development for fuel.
F. Photochemical smog is a type of smog produced when ultraviolet light from the sun reacts with nitrogen oxides in the atmosphere. It is visible as a brown haze, and is most prominent during the morning and afternoon, especially in densely populated, warm cities.