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Consider the following statements:
1. Biocides, polychlorinated biphenyls (PCBs) and heavy metals directly eliminate sensitive aquatic organisms.
2. Hot waters discharged from industries, when added to water bodies, lowers its DO content.
Which of these statements is/are not correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements:1. Biocides, polychlorinated biphen...
- Polluted water reduces Dissolved Oxygen (DO) content, thereby, eliminates sensitive organisms like plankton, molluscs and fish etc.
- Biocides, polychlorinated biphenyls (PCBs) and heavy metals directly eliminate sensitive aquatic organisms. Hot waters discharged from industries, when added to water bodies, lowers its DO content.
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Community Answer
Consider the following statements:1. Biocides, polychlorinated biphen...
Statement 1: Biocides, polychlorinated biphenyls (PCBs), and heavy metals directly eliminate sensitive aquatic organisms.
Explanation:
Biocides, PCBs, and heavy metals are all toxic substances that can have harmful effects on aquatic organisms. These substances can be introduced into water bodies through various sources such as industrial discharges, agricultural runoff, and improper waste disposal. When present in water, they can directly eliminate sensitive aquatic organisms by causing toxicity or even death. Biocides are specifically designed to kill or control the growth of organisms, while PCBs and heavy metals can have toxic effects on aquatic organisms at certain concentrations.
Statement 2: Hot waters discharged from industries, when added to water bodies, lowers its DO content.
Explanation:
When hot water is discharged from industries into water bodies, it can have several negative impacts on the aquatic ecosystem. One such impact is the reduction in dissolved oxygen (DO) content. Dissolved oxygen is essential for the survival of aquatic organisms as they rely on it for respiration. However, when hot water is added to water bodies, it can cause several changes that lead to a decrease in DO levels:
1. Increased water temperature: Hot water increases the temperature of the receiving water body. As water temperature rises, the solubility of oxygen decreases, leading to a decrease in DO levels.
2. Reduced oxygen diffusion: Higher water temperatures reduce the ability of oxygen to dissolve and diffuse into the water. This further contributes to a decrease in DO levels.
3. Increased metabolic rates: The introduction of hot water can increase the metabolic rates of aquatic organisms. This increased metabolic activity leads to higher oxygen consumption, further depleting DO levels.
Overall, the addition of hot water from industries to water bodies can result in a decrease in DO content, which can be detrimental to aquatic organisms that rely on oxygen for survival.
Conclusion:
Based on the explanations provided, both statements 1 and 2 are correct. Therefore, the correct answer is option 'D' - Neither 1 nor 2.
Explanation:
Biocides, PCBs, and heavy metals are all toxic substances that can have harmful effects on aquatic organisms. These substances can be introduced into water bodies through various sources such as industrial discharges, agricultural runoff, and improper waste disposal. When present in water, they can directly eliminate sensitive aquatic organisms by causing toxicity or even death. Biocides are specifically designed to kill or control the growth of organisms, while PCBs and heavy metals can have toxic effects on aquatic organisms at certain concentrations.
Statement 2: Hot waters discharged from industries, when added to water bodies, lowers its DO content.
Explanation:
When hot water is discharged from industries into water bodies, it can have several negative impacts on the aquatic ecosystem. One such impact is the reduction in dissolved oxygen (DO) content. Dissolved oxygen is essential for the survival of aquatic organisms as they rely on it for respiration. However, when hot water is added to water bodies, it can cause several changes that lead to a decrease in DO levels:
1. Increased water temperature: Hot water increases the temperature of the receiving water body. As water temperature rises, the solubility of oxygen decreases, leading to a decrease in DO levels.
2. Reduced oxygen diffusion: Higher water temperatures reduce the ability of oxygen to dissolve and diffuse into the water. This further contributes to a decrease in DO levels.
3. Increased metabolic rates: The introduction of hot water can increase the metabolic rates of aquatic organisms. This increased metabolic activity leads to higher oxygen consumption, further depleting DO levels.
Overall, the addition of hot water from industries to water bodies can result in a decrease in DO content, which can be detrimental to aquatic organisms that rely on oxygen for survival.
Conclusion:
Based on the explanations provided, both statements 1 and 2 are correct. Therefore, the correct answer is option 'D' - Neither 1 nor 2.
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Consider the following statements:1. Biocides, polychlorinated biphenyls (PCBs) and heavy metals directly eliminate sensitive aquatic organisms.2. Hot waters discharged from industries, when added to water bodies, lowers its DO content.Which of these statements is/are not correct?a) 1 onlyb) 2 onlyc) Both 1 and 2d) Neither 1 nor 2Correct answer is option 'D'. Can you explain this answer?
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