In which of the following industries is animal protein produced as waste?

$A$ farmer is using pesticides in his field. He uses the produce from his field as food for fish. He is told that the fish are not fit for human consumption because large amounts of pesticides were found in the fish cells. How is this possible? Explain.

Which of the following belongs to secondary air pollutants?

Assertion : Photochemical smog is produced by nitrogen oxides.
Reason : Vehicular pollution is a major source of nitrogen oxides.

Write a short note on the effect of Global warming and Greenhouse effect on environment.

How does the greenhouse effect contribute to global warming? Explain.