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प्रश्न
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.
उत्तर
a) Cause - Algal blooms are caused by the increased nutrient availability in the waterbodies. This high availability of phosphorus and nitrogen is in turn caused by the chemicals present in fertilisers that get dissolved in the soil and eventually get washed away to the water bodies.
Affect - These algal blooms may shade out plants that would normally live lower in the water column resulting in a loss of biodiversity. Eutrophication can also result in the development of hypoxic conditions. This oxygen deficiency may cause the death of aquatic animals. They ultimately degrade the quality of water.
b) Farmers in areas that are affected by algal blooms need to find alternative ways to fertilize the soil like using manures and techniques such as vermicomposting. Also, people must use cleaning agents and detergents that are biodegradable and that do not contain phosphates. To further reduce the amount of nutrients that are causing an overgrowth of algae in lakes and streams, laws need to be created that regulate the dumping of waste water.
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संबंधित प्रश्न
List the events that reduce the Biochemical Oxygen Demand (BOD) of a primary effluent during sewage treatment.
Two types of aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilisers.
Answer the questions based on the facts given above:
(i) Name the organisms depicting the patterns A and B.
(ii) State the reason for the growth pattern seen in A.
(iii) Write the effects of the growth patterns seen above.
Write critical notes on Eutrophication
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.
The expanded form of DDT is ______.
The loudness of a sound that a person can withstand without discomfort is about ______.
Which one of the following diseases is not caused due to contamination of water?
Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of ______.
Match the items in column I and column II and choose the correct option:
| Column I | Column II |
| A. UV | i. Biomagnification |
| B. Biodegradable Organic matter | ii. Eutrophication |
| C. DDT | iii. Snow blindness |
| D. Phosphates | iv. BOD |
The correct match is:
It is a common practice to undertake desilting of the overhead water tanks. What is the possible source of silt that gets deposited in the water tanks?
