The substance that pollute the water are called _________.</h2></div>

Maximum damage to forest cover is caused by</h2></div>

Which  one of the following is not a reason for shortage of usable water?</h2></div>

Given pie-diagram represents the relative contribution of various <span class="katex"><span class=&qu…

BOD (biological oxygen demand) is</h2></div>

If we uncover half of the forest, covering of the earth, what crisis will be produced at most and at first?<br> &l…

How pesticides, herbicides and fungicides are affecting the ecosystems? Explain about bioaccumulation and biomagnificati…

Which of the following are the colloidal materials present in domestic sewage?