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Eutrophication causes...

Eutrophication causes

A

Desert

B

Freshwater lakes

C

Ocean

D

Mountains

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The correct Answer is:
B
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Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Eutrophication causes reduction in

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Assertion: Eutrophication shows increase in productivity in water. Reason: With increasing eutrophication, the diversity of the phytoplankton increases

Eutrophication leads to death of fish due to

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Which of the following statements regarding eutrophication are correct ? (i) Eutrophication is the natural ageing of a lake by nutrient enrichment of its water. (ii) Pollutants from human activities like effluents from the industries and homes can radically accelerate the aging process of a lake. This phenomenon is called as cultural or accelerated eutrophication. (iii) The plant nutrients responsible for eutrophication are nitrates and phosphates. (iv) These phosphates and nitrates accelerate the growth of algae, which utilise oxygen and may deoxygenate the water to kill the fish and other aquatic animals.

ICSE-ENVIRONMENTAL ISSUES-COMPETITION CORNER (OBJECTIVE TYPE QUESTIONS)
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  4. What is the function of ozone in the upper atmosphere ?

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  5. Given pie-diagram represents the relative contribution of various GHGs...

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  6. Increase in concentration of the toxicant at successive trophic levels...

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  7. Eutrophicated lake has BOD

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  8. ESP is to arrest

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  9. If a water body is contaminated with a toxicant, its biomagnifi...

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  10. Which one of the following disease is related to cadmium pollution?

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  11. Lichens are

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  12. The natural ageing of a lake is called biomagnification.

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  13. Eutrophication causes

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  14. Which of the following is mainly produced by the activity of anaerobic...

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  15. Which one of the following statement is wrong in case of Bhopal traged...

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  16. High value of BOD (Biochemical Oxygen Demand) indicates that

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  17. Rachel Carson's famous book 'Silent Spring' is related to

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  18. The UN conference of Parties on climate change in the year 2012 was he...

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  19. Depletion of which gas in the atmosphe~e can lead to an increased inci...

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  20. A river with an inflow of domestic sewage rich in organic waste may re...

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