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Effect of Sewage on Water Bodies

The prime con...

Question

The prime contaminants in the lakes undergone eutrophication by sewage and agricultural wastes are

A

Sulphates and phosphates

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B

Nitrates and sulphates

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C

Nitrates and phosphates

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D

Nitrates and carbonates

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Solution

The correct option is C Nitrates and phosphates
Nitrogen and phosphorus are the main constituents of fertilizers. The indiscriminate use of fertilizers harms the environment in various ways. When nitrogen in the form of nitrates and phosphorus in the form of phosphates wipe out from the agriculture field through excessive irrigation or rain and even from the sewage, mixed with lake and causes eutrophication by supporting the algal bloom.
So, the correct answer is 'Nitrates and phosphates'.

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Q. Assertion :Cultural eutrophication is nutrient enrichment of water bodies due to human activities like passage of sewage, industrial effluents, etc. Reason: The prime contaminants from sewage and industrial effluents are nitrates and phosphates, which act as plant nutrients and overstimulate the growth of algae.

Q. What minerals are found in the runoff from agricultural land and untreated sewage effluents that are responsible for eutrophication of water bodies?

Q. Differentiate between :
Eutrophic lakes and oligotrophic lakes

Choose the correct statement(s):

(1) Sewage can be used with gobar and agricultural waste to produce bio gas in biogas plant.

(2) The largest composition in biofuel is of methane.

Q. Read the following statements related to eutrophication and select the correct option stating true (T) and false (F).

A. It is the process of aging of water bodies due to the excessive growth of algae, plants and other aquatic organisms.
B. It can be natural or accelerated.
C. Accelerated eutrophication occurs at a slow rate which cannot be predicted.
D. The prime contaminants for this phenomenon are nitrates and phosphates.

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