Pollutants from man's activities like effluents from the industries and homes can radically accelerate the ageing process known as :
(a) Biomagnification
(b) BOD
(c) Accelerated Eutrophication
(d) COD
Pollutants from man's activities like effluents from the industries and homes can radically accelerate the ageing process known as :
(a) Biomagnification
(b) BOD
(c) Accelerated Eutrophication
(d) COD
(a) Biomagnification
(b) BOD
(c) Accelerated Eutrophication
(d) COD
A
Biomagnification
B
BoD
C
Accelerated Eutrophication
D
COD
Text Solution
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The correct Answer is:
To solve the question regarding pollutants from human activities that can accelerate the aging process, we need to analyze the options provided:
1. **Understanding the question**: The question states that pollutants from human activities, such as effluents from industries and homes, can accelerate a certain aging process. We need to identify which of the given options relates to this phenomenon.
2. **Analyzing the options**:
- **(a) Biomagnification**: This refers to the increasing concentration of toxic substances in the tissues of organisms at each successive level of the food chain. It is not directly related to aging processes.
- **(b) BOD (Biochemical Oxygen Demand)**: This measures the amount of oxygen that microorganisms will consume while decomposing organic matter in water. It is not related to aging.
- **(c) Accelerated Eutrophication**: Eutrophication is the process by which water bodies become overly enriched with nutrients, leading to excessive growth of algae (algal blooms). This process can lead to the aging of aquatic ecosystems. When accelerated by human activities (like nutrient runoff from fertilizers), it can significantly impact water quality and aquatic life.
- **(d) COD (Chemical Oxygen Demand)**: Similar to BOD, COD measures the amount of oxygen required to chemically oxidize organic and inorganic matter in water. It does not relate to aging processes.
3. **Identifying the correct answer**: Based on the analysis, option (c) Accelerated Eutrophication is the correct answer. This process is indeed linked to the aging of aquatic ecosystems due to nutrient enrichment caused by human activities.
### Final Answer:
(c) Accelerated Eutrophication
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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.
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.
Given below are the steps involved in sewage treatment. Arrange them in proper sequence and select the correct option. A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air. B. Passage of secondary effluent and formation of activated sludge. C. Physical removal of particles through filtration and sedimentation D. Release of effluent from the secondary treatment plant into natural water bodies. E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.
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