What is algal bloom?</h2></div>

Biochemical oxygen demand measures</h2></div>

Which of the following element is most hazardous to humans?

Is deforestation associated with global warming? Explain. </h2></div>

Who enhances the degradation of ozone?

Which of the following cause green house effect?<br> (i) Deforestation<br> (ii) Emission of gases from facto…

Which of the following is the most dangerous environment hazard to mankind? </h2></div>

Why are catalytic converters used in automobiles?</h2></div>