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Practice each question, then open the answer or worked solution.
What is an algal bloom?
Ans: An algal bloom is a rapid increase in the population of algae in freshwater or marine water systems which can occur due to various reasons. Some algal blooms are the result of excess nutrients in the water accumulated over time or by human action, mainly nitrates and phosphates. This increases the growth of algae and green plants in water bodies and leads to eutrophication.
What do you understand by biomagnification?
Ans: The increase in the concentration of toxins in the body of living organisms at each trophic level of a food chain is termed biomagnification. It is known as the increase in concentration of pollutants as we move from one trophic level to the next.
What are the three major kinds of impurities in domestic wastewater?
Ans: There are three major kinds of impurities in domestic water which are:
a) Suspended impurities like sand, silt, clay.
b) Colloidal materials like fecal matter, bacteria, cloth, paper, etc.
c) Dissolved materials like nutrients (nitrate, ammonia, phosphates).
What is reforestation?
Ans: Reforestation is a natural or artificial restocking of existing forests and woodlands that have been depleted due to manmade or natural action. It is regenerating, replanting forest areas that were destroyed for the benefit of mankind for building industries, houses, or any other projects. This allows the forests to be reestablished and includes planting trees in the areas that have been deforested.
What is the best solution for the treatment of electronic wastes?
Ans: The best solution yet found for the treatment of electronic wastes is recycling the waste products. Electronic waste recycling facilities have advanced considerably over the years and now they can be recycled by 95-98% by weight.