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प्रश्न
The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?
पर्याय
The addition of undesirable substances to water-bodies
The removal of desirable substances from water-bodies
A change in pressure of the water bodies
A change in temperature of the water bodies
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उत्तर
A change in pressure of the water bodies
Explanation:
Water pollution can be defined as an undesirable change in the physical, biological or chemical qualities of water that adversely affects aquatic life and makes water unfit for use. Water pollution is caused due to addition of undesirable substances (pollutants) to the water bodies. Polluted water may be devoid of certain desirable substances like oxygen, essential nutrients, optimum pH etc. Thermal pollution, i.e., changes in the temperature of water bodies can adversely affect aquatic organisms and cause their death.
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संबंधित प्रश्न
Describe biological water cycles.
Why is water cycle important to human?
Water cycle controls Earth‛s temperature.
Describe the processes involved in the water cycle.
What are balls of ice?
Analogy:
Evaporation: Sea:: ______: Trees.
Fill in the blanks in the given passage.
The rainwater and ______ from other sources such as rivers and ponds seeps through the ______ and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called ______.
Biological oxidation is the method is used in ______.
The cyclic flow of nutrients between non-living and living factors of the environment is termed as ______ cycle.
Match the following:
| Water cycle | Application of fertilizers |
| Nitrogen cycle | Sunlight |
| Carbon cycle | Deforestation |
| Abiotic factor | Volcanic activities |
