Eutrophication of water body results from –

Which one of the following is the main reason of acid rains?

Methemoglobinemia is caused by the drinking of water contaminated with

Mercury is a toxic substance that severely contaminates land, water, air and the food chain. Which among the following is source of mercury pollution?

Which one of the following statements is true with regard to a greenhouse?

In the environment, plastics will not be decomposed by the action of