Which of the following shows a modern technology measure used to preserve and conserve the environment?</h2></d…

Which of the following is not correct regarding the primary treatment of waste-water?

Azolla gives a good biofertilizer when mixed with</h2></div>

Chlorination of treated waste water is required for<span><br> </span></h2></div>

Which of the following is not true for a biogas plant?

Select the correct statement from the following </h2></div>

Describe any two uses of bacteria in industry.</h2></div>

Which of the following, grows symbiotically in the leaves of water fern?</h2></div>