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प्रश्न
What’s the solution?
Rivers and lakes are filled with water hyacinth.
उत्तर
If organic substances mix with water, there is the growth of water plants like water hyacinth. But when they grow excessively, it causes problems for other aquatic organisms. During the daytime, water hyacinth releases oxygen but at night they too require oxygen. This causes depletion of dissolved oxygen in the water and hence many other organisms die due to lack of oxygen. Their dead remains act as fertilizers and they help the hyacinth grow more. Such a body gets filled with water hyacinth. In order to save the environment of such a water body, first of all, the water hyacinth should be removed. This is also called eutrophication. Care should be taken that no organic pollutants enter this body. Bund may be constructed around a lake or a river so that the land pollutants will not be let out in them. This will arrest the growth of water hyacinth.
संबंधित प्रश्न
The Biological/technical term for The process causing an undesirable change in the environment
Following is a statement about pollution. Which type of pollution does it express?
Many times, vomiting and dysentery occurs after eating 'pani puri'
Match the pairs from 'A' and 'B' columns and explain the effect of pollution on human health.
| Column 'A' | Column 'B' |
| 1. Water containing cobalt | a. Mental retardedness |
| 2. Methane gas | b. Paralysis |
| 3. Water containing lead | c. Inflammation of lungs. |
| 4. Sulphur dioxide | d. Skin cancer |
| 5. Nitrogen dixoide | e. Irritation of eyes |
What is pollution?
Construct two slogans each on air, water and soil pollution.
True or False:
Indoor pollution is 10 times more toxic than outdoor pollution.
What is noise pollution? What harm does noise pollution do to human beings?
Explain with examples the difference between the primary and secondary pollutants.
What is noise pollution? How is it caused?
Name the following:
The undesirable change in the environment leading to its deterioration.
