Question

Define pollution. With reference to water pollution, explain biochemical oxygen demand, algal bloom biomagnification and eutrophication.

Answer 1

Hint: The pollutants introduce the contaminants into the natural atmosphere that cause adversative change. It can take the form of chemical materials or energy, such as sound, heat, or light. The components of pollution can be in any form of foreign substances or energies. They can be either or logically happening contaminants. The abbreviated form of Biological Oxygen Demand is BOD.

Complete answer:
- The addition of the objectionable quantities of wastes and pollutants in the earth, marine bodies, air, or any other properties which result in the degradation of the quality of the resource is called Pollution.
- It can be defined as the quantity of oxygen pre required by microorganisms to break down the biological matter extant in a certain volume of a sample of water.
- From time to time, the streams drain into the marine bodies to introduce nutrients such as nitrogen and phosphorus. This encourages the growth of aquatic organisms in those places. The algal bloom occurs wherever the fertility of the lake increases.
- The accumulation of cumulation of bioconcentration of lipophilic pesticides in the top associates of the food chain is known to be the process is known to be the Biomagnification. The concentration of pesticides goes on increasing according to the food chain during the biomagnification.
- The aging of a water body due to nutrient enrichment of its water is known as Accelerated eutrophication. We can say that this condition is due to the activities of the chemicals comprising the compounds of nitrates and phosphates in the water system.

Note: The quantity of BOD in the water is a measure of the amount of organic material in the water. The rate of BOD is high as it contains a large number of organisms in polluted water. We can say that the deterioration of water quality and fish mortality and dead remains is caused by algal bloom. It causes the beginning to be deposited on the lake bottom.