What phenomenon occurs due to the accumulation of certain pollutants that increase in concentration along the food chain…

BOD of wastewater is amount of</h2></div>

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

Increasing skin cancer and high mutation rate are the result of _______________.</h2></div>

Incinerator is ________.<br> </h2></div>

Which of the following is a cyclic and zero waste procedure?

If BOD of river is high, it means that the river </h2></div>

Which of the following element is most hazardous to humans?