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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?
विकल्प
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
Mention two main functions of water for living organisms.
Water becoming water vapour on heating is called evaporation.
Evaporation is the _______ stage of the water cycle.
Which of the following processes add water vapour to the atmosphere?
- Transpiration
- Precipitation
- Condensation
- Evaporation
Water present in rivers, lakes, and ponds is unfit for use by human beings.
The process of water changing into its vapour, is called evaporation.
Water from oceans, lakes, ponds, and rivers evaporates due to the heat of ______.
Which of the following are not the liquid forms of water?
- Snow
- Lake water
- River water
- Water vapour
- Ice
Choose the correct combination from the options below.
Explain the three stages of the water cycle.
Name three Biogeochemical cycles.
