How much amount of dissolved oxygen does gravely polluted water consists of?

Which of the following is the consequence of deforestation?

The major source of BOD in the river Ganga is </h2></div>

Mark the correct statement about biomedical wastes.</h2></div>

Which of the following process does maximum destruction of ozone?</h2></div>

Solid waste increases with an increase in<span><br> </span></h2></div>

Write any one ill-effect of deforestation.</h2></div>

The enhanced growth of water hyacinth in lakes can be due to</h2></div>