Green house effect is due to</h2></div>

Which of the following would happen in the absence of greenhouse effect in the atmosphere?</h2></div>

What is the reason for the increase in the BOD?

Which of the following problem occurs due to the use of nuclear energy?

UV radiations bring about</h2></div>

Main cause of extinction of species from tropical areas is</h2></div>

What are the sources of water pollution? What steps could be taken to prevent water pollution?</h2></div>

Plants control the humidity in air by</h2></div>