What will happen if fresh water lake gets contaminated by addition of polluted water with high BOD?

When a freshwater lake gets contaminated by the addition of organic pollutants, the amount of dissolved oxygen in the lake will decrease. Biological oxygen demand (BOD) is a measure of the amount of oxygen required by microorganisms to decompose organic matter in the water. As the microorganisms decompose organic pollutants, they consume more dissolved oxygen from the water, leading to a decrease in the overall
oxygen levels. This decrease in dissolved oxygen can have detrimental effects on the ecosystem of the lake, impacting the survival of aquatic organisms.
(2) The addition of polluted water with high BOD will have consequences on the lake’s ecosystem, particularly the oxygen levels and the organisms living within it.
(3) The addition of polluted water is more likely to harm submerged aquatic plants rather than increase their numbers.
(4) The addition of polluted water with high BOD can lead to a decrease in dissolved oxygen, making it diffi cult
for aquatic animals to survive. The contaminated water may also contain toxic substances that can harm or kill
aquatic animals.