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Question
With the help of a flow-chart exhibit the events of eutrophication.
Solution
The events in eutrophication are as follows:
The excessive use of fertilizers (nutrients) are washed out with rainwater.
They flow from the fields into the nearby water bodies.
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The profuse growth of algae leads to algal bloom.
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Algae consume an excessive quantity of oxygen.
This causes depletion of oxygen in water for other organisms.
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Algae often release toxins.
These inhibit the growth of other algae and aquatic animals (fishes).
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This leads to nutrient enrichment of water and loss of species diversity
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Such a condition is called eutrophication.
RELATED QUESTIONS
State the cause of accelerated eutrophication
How does algal bloom destroy the quality of a fresh water body? Explain.
Name the two different categories of microbes naturally occurring in sewage water.
List the events that lead to biogas production from waste water whose BOD has been reduced significantly.
"Determination of Biological Oxygen Demand (BOD) can help in suggesting the quality of a water body." Explain.
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
Write critical notes Biological magnification
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.
As a student of biology, do you agree with their delight? Give reasons in support of your answer.
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.
Which one of the following diseases is not caused due to contamination of water?
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:
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 |
