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प्रश्न
How does algal bloom destroy the quality of a fresh water body? Explain.
उत्तर
An algal bloom is the phenomenon of excessive growth of planktonic forms in a nutrient rich water body. As the planktonic species multiply on the surface they from a layer that eventually covers the entire surface of the water body. They block sunlight, which does not reach submerged aquatic plants that may have a role in supplying necessary nutrients to other aquatic life forms and keeping the water clean.
Excretory substances released by planktons build up in concentration and pollute the water. Some algal species even release substances that are toxic for other life forms in the water body. Also, due to the high respiratory needs of such a huge concentration of biomass on the surface, the biological oxygen demand (BOD) of the water body increases, causing many of the life forms to die. Their carcasses further contribute to the deterioration of the quality of the water content.
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संबंधित प्रश्न
List the events that reduce the Biochemical Oxygen Demand (BOD) of a primary effluent during sewage treatment.
"Determination of Biological Oxygen Demand (BOD) can help in suggesting the quality of a water body." Explain.
Write critical notes Biological magnification
Write critical notes Groundwater depletion and ways for its replenishment
Plenty of algal bloom is observed in a pond in your locality.
(a) Write what has caused this bloom and how does it affect the quality of water.
(b) Suggest a preventive measure.
Explain the role of microbes in cleaning sewage water into usable water.
Answer the following question:
While on a visit to a pond in the city-neighborhood, the visitors were delighted to find a large expanse of water covered with colorful algal mass.
Explain the cause of such algal growth.
Match the following and choose the correct option:
| Column I | Column II |
| A. Environment Protection Act | i. 1974 |
| B. Air Prevention & Control of Pollution Act | ii. 1987 |
| C. Water Act | iii. 1986 |
| D. Amendment of Air Act to include noise as an air pollutant | iv. 1981 |
The correct matches are:
Which of the following water samples in the table given below, will have a higher concentration of organic matter?
Match the following and choose the correct option:
| Column I | Column II |
| A. Environment Protection Act | i. 1974 |
| B. Air Prevention & Control of Pollution Act | ii. 1987 |
| C. Water Act | iii. 1986 |
| D. Amendment of Air Act to include noise as an air pollutant | iv. 1981 |
