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Byju's Answer
Standard IX
Biology
Steps Involved in the Nitrogen Cycle
High concentr...
Question

High concentration of nutrients especially nitrates and phosphates in water can accelerate which of the following phenomena?


A

Algal bloom

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B

Eutrophication

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C

Biomagnification

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D
(a) and (b) above.
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Solution

The correct option is D (a) and (b) above.

When the water bodies get enriched with nutrients which provide an ideal environment for the excessive growth of plants and algae. It results in eutrophication, which means that the excessive growth of algae, which gives a particular color to the water, is called algal bloom.


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Q. High concentration of nutrients in water, especially nitrates and phosphates, can accelerate which of the following phenomena?

(i) Algal Bloom
(ii) Eutrophication
(iii) Biomagnification

Q. 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.
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.

Which of the following statements about eutrophication are correct?

(i) It can be a naturally occurring process.

(ii) It commonly occurs in stagnant rather than running water.

(iii) It does not affect oxygen level of water bodies.

(iv) It is commonly associated with high levels of phosphates and nitrates.


Q. Release of phosphates and nitrates in water bodies (rivers and lakes) leads to
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