Science 3 Marks Question

	Source of water	Form of water
Clouds	Land	Liquid form (Dropled of water)
Plants	Soil	Liquid form
Mountain tops	Atmosphere	Solid form
Aquifer	Rain	Underground water
Aimals	Waterbodies	Liquid

For maintaining the garden, we can take following steps to minimize the use of water:

1. We can employ drip irrigation to water the garden. Drip irrigation is a technique of watering plants by making use of narrow tubings which deliver water directly at the base of the plant.
2. We should water the plants in garden in early morning hours. If you are unable to water early in the morning, late afternoon is the next best, this is after the sun's heat has lost its harshness but before the chill in the air begins to set in.
3. We should avoid using a sprinkler during windy weather, as the water will blow away and evaporate, wasting the water.

1. Harvesting of rainwater.
2. Directing water from surplus areas to regions of scarcity.
3. Controlling floods by interlinking of rivers.

Water drawn from underground water gets replenished by seepage of rainwater. The water table does not get affected as long as we draw the same amount of water as is replenished by natural resources like rain. However, there are number of factors which cause depletion of water table at a very fast rate which is really a matter of concern for everyone of us. Increase in population, industrial and agricultural activities are some common factors affecting water table. Scanty rainfall, deforestation and decrease in the effective area for seepage of water may also deplete the water table.

Water below the water table where water is found between particles of soil and between rocks is called groundwater. Water table is the upper level of water under the ground which occupies all the spaces in the soil and rocks. The ground water provide water to wells, bawris, tube wells, hand pumps.

In nature, water exists in three forms:

1. As a solid, it exists as icecaps at the poles, snow covered mountains and glaciers.
2. As a liquid, it is in the form of water in oceans, lakes and rivers, and underground water.
3. Its gaseous form is the water vapour in the air around us.

1. Minimum wastage of water is called water management.
2. We should save water to prevent water crisis.
3. Shishir is sincere, responsible and has capability of applying knowledge practically.

Rain water and the water from water bodies on earth’s surface pass through the soil by the process of infiltration. The infiltrated water then gets accumulated in the aquifer deep under the ground. There are some layers of impermeable rocks which prevent the water in the aquifer from seeping down further. In this way, the ground water is recharged.

Rajasthan is a hot and dry place. The challenge of natural scarcity of water was met by a successful experiment. A band of social workers had transformed a dry area into a green place. They have revived five dried-up rivers by constructing water harvesting structures.

Large scale deforestation has occurred to accommodate the growing population, to grow food for them and to provide space for industries. Vegetation slows down the flow of rainwater on land and increases the absorption of water by the soil. Cutting down of trees and destroying vegetation, therefore interferes with the natural process by which seeping takes place and the groundwater is recharged. It finally results in the depletion of the water table.

The number of problems that can be faced due to shortage of water are as follows.

1. Less amount of pure drinking water will be available.
2. Lack of equal distribution of water.
3. Drought.

Water conservation is process of preventing wastage of water, using water carefully and recharging ground water.Water conservation can be done by:

1. Repairing leaking pipes and taps.
2. Not wasting water during brushing teeth, shaving, bathing, washing clothes and during other activities.
3. Rainwater harvesting.
4. By drip irrigation of plants.

Water is used for various activities such as agriculture, industries, cooking, cleaning utensils, bathing, washing clothes, and, most importantly, for drinking. Water is a precious source because all our daily activities are carried out with the help of water only. Water is found everywhere but not everywhere it is drinkable/ usable. Though the seas have no lack of water but still we can't drink or use it anywhere. Water helps in nourishment of animals and plants. We can't live without water and because it is scarce, that’s why water is precious. Plants need water to absorb nutrients from the soil and make their food. Without water, plants would die, and greenery would be lost. This, in turn, would mean the end of all life on the earth, because without plants, there would be no food, oxygen or rainfall. There would also be many other problems.

Increasing population creates demand for construction of houses, shops, offices, roads and pavements. This decreases the open areas like parks, and playgrounds. This, in turn, decreases the seepage of rainwater into the ground. A cemented floor does not allow water to seep in easily, while in a grass lawn water seeps through in no time. Moreover a huge amount of water is required for construction work. Often groundwater is used for this purpose. So, on the one hand we are consuming more groundwater, and on the other we are allowing lesser water to seep into the ground. This results in depletion of water table. In fact, the water table in some parts of many cities has gone down to alarmingly low levels

The three causes of water scarcity in our country are.

1. Rapid urbanisation.
2. Increased number of industries.
3. Population explosion.

The main causes of water scarcity in our country are:

1. Rapid urbanisation.
2. Increased number of industries.
3. Population explosion.

To maintain a garden, water is necessary. Therefore, to minimize the use of water, we can apply the drip irrigation method. In this method, water is supplied directly to the base of the plants using narrow pipes, thereby reducing the loss of water.

1. Solid.
2. Gaseous.
3. Well.
4. Lake.
5. Ice.