Decomposition of organic wastes in water causes </h2></div>

<b>Define electronic waste and list at least six items which come under this category.</b><br> </h2…

Ozone layer of upper atmosphere is being destroyed by</h2></div>

A lake receiving nutrients would be</h2></div>

Bio-agents such as culture of blue green algae are used in preparation of</h2></div>

 The polluting strength of sewage is usually characterized by its</h2></div>

What is Ozone layer? Explain the effects of the depletion of ozone layer.</h2></div>

Protective layer of ozone in the atmosphere exists in which layer?</h2></div>