Water dissolves the chemicals from agricultural fields and takes them to nearby waterbodies. Suggest how does this affect the aquatic life and other organisms?
Rainfall patterns are decided by the prevailing wind patterns. Comment.
The chemicals like fertilisers and pesticides from agricultural fields run off with water and get added to waterbodies present nearby. The polluted water can affect the aquatic and land organisms in many ways such as
Death of flora and fauna of waterbodies As the amount of organic wastes increases in water, bacteria and other organisms multiply very fast by using the dissolved oxygen present in the water thus, making the waterbody deficient in oxygen. This lack of oxygen inturn kills the fishes and other aquatic animals.
Increased level of toxic chemicals The phenomenon of increase in the concentration of harmful chemicals in the body of living organisms at successive trophic level is called biomagnification. This increasing toxicity kills the organisms by accumulating in them over long period of time.
Rainfall patterns are decided by the prevailing wind patterns, because in large parts of our country, rains are mostly brought by the South-West or North-East monsoon. In some areas, these are caused by the depression in the Bay of Bengal.