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Online NCERT Solutions for Class 7 Science – Water and Water Cycle

Online NCERT solutions for Class 7 Science - Water and water cycle

CBSE NCERT Solutions for Class 7 Science- Water and water cycle

Class 7 ScienceWe at Takshila Learning always to do best to keep our students ahead in terms of learning and preparation. We offer animated videos, recorded lectures with detailed explanation, sample papers with solutions, objective and subjective study material, NCERT solutions for Class 7 for all subjects. We post articles and blogs for students related to important topics, notifications, and information related to exams. In this article, we explained ‘Scope of Water’ from CBSE Class 7 Science.

Class 7 Science – Water and water cycle

Around 70% of the Earth is wrapped in water in the form of ice, seas, oceans, rivers, lakes, ground water and moisture in the surrounding. But large amounts of water is not suitable for man consumption. Only fresh water is fit for human consumption. Means 0.006% of the water is only available for use.

Water exists in three forms – Solid, Liquid and gaseous form.

  • As a solid form, it resides as glaciers, snow mountains and ice caps at the poles.
  • As a Liquid form, it exists in oceans, seas, rivers, lakes and ground water.
  • As a gaseous form, water vapors in the air.

Water Cycle

The continuous process of evaporation, condensation, precipitation, infiltration of water in nature keeps the level of water on the earth constant is called the water cycle.  Now understand

Evaporation is the process of conversion of water molecules into vapor.Water vapor accumulates in the sky in the form of clouds.

Condensation is the process of conversion of water vapor into water by cooling.

Precipitation occurs when water falls from the sky in the form of rain, snow, hail, or sleet.

Infiltration is the process of seeping of water into the ground.

Sometimes, ground water stores between layers of hard rock. This is known as an aquifer. Water in aquifers can be drawn with tube wells and hand pumps.

Watch interesting videos on water cycle of online classes for Class 7 Science

Water table – water seeps into the ground and moves downward, the level below which the ground  is saturated with water,  is called the water table.

Ground water – Ground water is the water drive below the water table.

Depletion of water table
As long as the water drawn from the ground is restored by infiltration of rain water, the water table remains unaffected. The problem begins when we take more water from the ground than is stored by natural means. as the water table reduces, and it is said to have been depleted.

Reasons for depletion of the water table

  • Demand for water increases with the increasing population
  • Further wells are dug and water is hatched from them
  • Increasing demand of water for industrial activities. Example: Construction industry uses tube-wells
  • Increase in agricultural activities, as lakes and streams are not available everywhere, ground water is used for
  • insufficient rainfall is one of the reason for depletion of the water table.
  • Deforestation

Water management

Water management is the continuous process for the matching of water resources with the water requirements of a place.
Water management generally involves activities that identify sources of water, prevent wastage of water, and implement recycling of water.
Treatment of water to make it suitable for human consumption. Examples: Water leaking from pipes, Fixing Leaking taps, Water over-flowing from buckets while the clothes are being washed alongside, Using water wisely while brushing the teeth, shaving, bathing, washing and during many other activities, practicing rainwater harvesting.

Conservation of water

Rather letting the rainwater run-off into the sea or ocean, it can be used to revitalize ground water. This is called rainwater harvesting.
Rainwater harvesting can be used to elevate the water table in arid areas. It can also be used to create water storage areas.
Farming, which typically requires huge quantities of water, can also benefit from good water management. Bawris and drip irrigation are used for rainwater harvesting.

Effects of water scarcity

Plants use water to absorb nutrients from the soil and make their food. Plants would die without water and. It would mean the end of all life on the earth because, without plants, there would be no food, oxygen or rainfall. We have to face many other problems.

NCERT solutions and detailed explanations for each topic to help the students enjoy the learning process and eventually get good marks. 

For more information, NCERT Solutions class 7 science, Online CBSE class 7th science, Study material 7th class science, login with Takshila Learning.

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September 10, 2017

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