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प्रश्न
Explain water cycle in detail.
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उत्तर
It represents the exchange of water between air, land and sea and between the living organisms and the environment.
Two overlapping water cycles are operating in nature:
(i) Global water cycle-
Water evaporates from the hydrosphere (oceans, lakes, rivers seas, ponds) by the heat of the sun and forms clouds. Clouds are carried over to the land by winds. After getting cooled, water in the clouds falls on the earth in the form of rain, sleet and hail. This water again evaporates in the atmosphere and completes the global water cycle.
(ii) Biological water cycle-
Here, the living organisms, i.e., plants and animals, consume water from the global water cycle and return it back. Plants release water in the form of water vapours by the process of transpiration. Animals return water to the air as vapours by the process of respiration and to the soil in the form of fluid by the process of excretion.
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संबंधित प्रश्न
Mention two main functions of water for living organisms.
Why does the water split on the floor disappear after some time?
Name two processes responsible for the formation of clouds.
Is water cycle important for farming? _______
The ice sheets from the north and south poles and the icecaps on the mountains, get converted into water vapour through the process of ______.
Water evaporates into air from oceans, rivers, and lakes but not from the soil.
Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a droplets of water around it. Why?
There is mass mortality of fishes in a pond. What may be the reasons?
Most of the water that falls on the land as rain and snow, sooner or later goes back to a sea or an ocean. Explain how it happens?
Match the following:
| Water cycle | Application of fertilizers |
| Nitrogen cycle | Sunlight |
| Carbon cycle | Deforestation |
| Abiotic factor | Volcanic activities |
