Question

In a pond ecosystem,the BOD increases due to which reason

Answer 1

A high standard of living involves a high demand for water and, at the same time, causes much greater pollution of this essential element for life. The resultant interference in the natural cycle can often overwhelm natural processes of recovery, so that, in addition to products arising from the decomposition of natural substances (e.g., proteins, greases, carbohydrates) there is a build-up of anthropogenous additives such as pesticides, effluents and garbage, which contaminate drinking water supplies with their toxic or hormonal effects. They may also consume such large quantities of oxygen that water resources become fouled. 

To prevent the threat of possible danger to health, or the very existence of certain species, it is essential to determine the quality of a water source before water is drawn off for consumption. 

Answer 2

BOD means bological oxygen demand in an ecosystem. BOD is an indicator of the organic polutant increase in the ecosystem. Less BOD is an indicator of good water that is having enough dissolved oxygen for the survival of the organisms present in the pond ecosystem. BOD increase means the deficiency of dissolved oxygen in the pond ecosystem.

It indicates the increase in bacteria decomposing organic wastes in the pond like sewage and organic wastes.