Which of the following is used in organic farming?</h2></div>

Who utilizes the maximum amount of oxygen in the upstream of sewage discharge?

What Air pollution?<br> </h2></div>

Radioactive substances can cause</h2></div>

Decrease in species diversity in tropical countries is mainly due to<br> </h2></div>

Which of the following defines the effect of deforestation on the next generation?</h2></div>

What is a small glasshouse used for growing plants especially during winter called?

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