List any four factors which determine the amount of dissolved oxygen in water. Explain in brief the harmful effects of n…

__________ is a biomedical waste.<br> </h2></div>

What are the effects of ultraviolet radiations on humans?<br> </h2></div>

Ozone hole over Antarctica appear during</h2></div>

Which of the following does not contributes to greenhouse effect?</h2></div>

Explain the following.<br> (i) Salination <br> (ii) Ozone hole <br> (iii) Pollution<br> (iv) Sec…

<span>Chernobyl explosion occurred in</span></h2></div>

Which one of the following ways can be used to control global warming?