Which of the following set represents greenhouse gases?</h2></div>

What is air pollution ? What are the harmful effects of sulphur dioxide, nitrogen dioxide and hydrogen sulphide present …

Which of the following is a secondary treatment for water pollution?

What amount of noise may damage eardrums thus permanently impairing hearing ability?

Select the correct option among the following.<br> </h2></div>

How are the wild animals affected by cutting of forest?</h2></div>

.................. has destructive effects on the entire ecosystem.</h2></div>

Name the radiations from the Sun that are absorbed by ozone layer. Mention one harmful effect caused by them.</h2>…