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Importance of Algae

The overgrowt...

Question

The overgrowth of algae due to phosphate can take up the oxygen in water and kill other aquatic life. This is called ________.

A

Biodegradation

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B

Biomagnification

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C

BOD

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D

Eutrophication

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Solution

The correct option is D Eutrophication
D. Eutrophication
Solution : Eutrophication is the killing of aquatic life due to overgrowth of algae from fertilizers washed up into the ponds and lakes from nearby farmlands. Algae use up the dissolved oxygen from the water and thus the aquatic life dies due to oxygen starvation.
So the correct answer is "Eutrophication".

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Q. Abundance of phosphate, causing algal overgrowth, resulting in depletion of oxygen and killing other aquatic life is known as

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. 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.

Q. Phosphates and nitrates entering a lake cause an explosive growth of algae, this is called

Q. The excessive use of phosphates as water softeners leads to aquatic pollution. This process is called:

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