Lesson: Water: A Precious Resource

Type 1 $–$ Very Short Answer Questions (6 Q.)

Question: 1

Which process is responsible for the maintenance of water on Earth?

Solution:

Water cycle

Question: 2

What is Bawri?

Solution:

Bawri is a traditional way of collecting ground water.

Question: 3

Name one economical method of irrigation.

Solution:

Drip irrigation

Question: 4

Name two sources of water that can help in seepage of water under the ground, other than rainwater.

Solution:

Rivers & Ponds

Question: 5

What is water table?

Solution:

The upper layer of ground water is called water table.

Question: 6

In a construction site, which source of water is generally used?

Solution:

Underground water through ‘boring’

Type 2 $–$ Short Answer Questions (6 Q.)

Question: 1

“Water circulates in all three forms in water cycle”. State whether it is true or false, if true write three forms of water.

Solution:

Yes, it is true.

Water circulates in three forms in the water cycle, these are: Solid (ice, glaciers), Liquid (water) and Gas (water vapour).

Question: 2

Explain drip irrigation.

Solution:

Drip irrigation is a method of irrigation that uses narrow tubes to deliver water directly to the base of plant. This reduces wastage of water and therefore is an economical method of irrigation.

Question: 3

What is rainwater harvesting?

Solution:

Rainwater harvesting is a process in which rainwater is collected and stored to increase the level of ground water and to make water available during scarcity of water.

Question: 4

Why is water necessary for plant life?

Solution:

Plants absorb nutrients from soil with the help of water. They prepare their own food in the presence of water. Hence, water is very important for the survival of plants.

Question: 5

Why ocean water is not fit for human consumption?

Solution:

Ocean water is not fit for domestic and agricultural purposes because ocean water is salty, although we can use that water after treatment and purification, but that is an expensive process. Hence, ocean water cannot be used for domestic purposes.

Question: 6

What do you understand by mismanagement of water?

Solution:

Mismanagement of water implies wastage of water. It is one of the reasons for scarcity of water. If water sources are managed wisely then the available water can be used for some more time. Leaking taps, brushing teeth with running tap are some example of mismanagement of water.

Type 3 -Long Answer Questions (6 Q.)

Question: 1

What will the impact if no water is available to all the plants throughout the world?

Solution:

Plants get nutrients from the soil through water. Plants need nutrients to prepare their own food.

In the absence of water, plant will not be able to make its own food. Plants are primary source of energy for all living beings. If plants do not get food for very long time, it will result in non- availability of food and oxygen. This will result in end of life on earth.

Question: 2

Explain water cycle in detail.

Solution:

Water cycle is a cyclic movement of water starting from evaporation and ending at precipitation. This process is explained below.

i.         The water present on earth surface changes into water vapour by the process of evaporation.

ii.         The water vapour converts into gaseous state by the process of condensation to form clouds.

iii.         This clouds release water to earth through rain i.e. the process of precipitation.

iv.         Rain gets soaked in as ground water and also flows out into rivers, seas and oceans.

v.         This water on the surface of Earth follows the same cyclic process.

Question: 3

State the reasons for diminishing underground water.

Solution:

i.            Increase in population: Increase in population increases demands on water usage, which in turn creates pressure on our existing underground water sources. Therefore, it leads to scarcity of water.

ii.            Increase in industries: Increase in industries lead to increase in usage of water for many purposes. Most industries use ground water, leading to depletion of ground water and ultimately resulting scarcity of water.

iii.            Increase in Agricultural activities: Increase in agricultural activities forces the farmers to be more dependent upon ground water. This leads to excessive use to ground water, resulting in diminishing water table.

Question: 4

Your family members clean home every day by washing the floor of your house that results in wastage of water. Suggest a method to avoid wastage of water.

Solution:

I will suggest my family members to mop the floor instead of washing it every day and if it is necessary, then washing should be done once a month. If my family members refuse my suggestion then I will give them a brief knowledge about scarcity of water and its consequence on the life on earth.

Question: 5

How does increase in population affect our daily life?

Solution:

Due to increase in population, the following impacts are observed:

i.         Increase in population leads to increased demand for houses.

ii.         It also creates demands to increase availability of shops and offices.

iii.         It also leads to increase in demands for more roads and transportation facilities.

iv.         It creates a population pressure on agriculture.

v.         Increase in population pressure results in increased demands on industries for more goods.

Question: 6

List some activities to conserve water at an individual level.

Solution:

i.         Mopping floor instead of washing it.

ii.         Repairing leaking taps and tanks immediately.

iii.         Turning off taps while brushing or shaving.

iv.         Using a bucket of water for bathing instead of shower.