Assertion: The prime contaminants of the eutrophic water body are nitrates and phosphates which acts as plant nutrients.
Reason: They overstimulate the growth of algae, fishes and other aquatic animals and robbing the water of dissolved oxygen.

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.

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.

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.

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.

Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. Reason : It is due to biomagnifications

Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. Reason : It is due to biomagnifications

Assertion : The process in which nutrient rich water bodies develop plant population is called eutrophication. , Reason : Eutrophication helps in enhancement of plants and animals population by providing them oxygen.

Assertion : The process in which nutrient rich water bodies develop plant population is called eutrophication. , Reason : Eutrophication helps in enhancement of plants and animals population by providing them oxygen.

A water body characterized by nutrient rich water supports abundant growth of phytoplanktons and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less. There is an extremely low level of dissolved oxygen in a eutrophicated water body because:

A water body characterized by nutrient rich water supports abundant growth of phytoplanktons and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less. In eutrophicated water body, growth rate of phytoplankton is high because of: