NCERT Class VII Science Solutions: Chapter 16-Water: A Precious Resource Part 3

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Question 13:

What is the source of water in each of the following?

  1. Wells

  2. Ground

  3. Atmosphere

Answer:

  1. From ground water

  2. Rain

  3. Evaporation

Question 14:

State whether the following statements are true or false. If false, give the correct statement.

  1. The process of seeping of water into ground is called filtration.

  2. 51% of the earth’s surface is covered with water.

  3. Year 2003 was observed as the International Year of Freshwater.

  4. Snow and ice both are solid forms of water.

Answer:

The process of seeping of water into ground is called filtration. (False)

Hint: It is called infiltration.

Image of what is infiltration.

What is Infiltration.

Image of what is infiltration.

  1. 51% of the earth’s surface is covered with water. (False)

    Hint: It is not

  2. Year 2003 was observed as the International Year of Freshwater. (True)

  3. Snow and ice both are solid forms of water. (True)

SHORT ANSWER QUESTIONS

Question 15:

Fill in the blanks in the given passage.

The rainwater and _______________ from other sources such as rivers and ponds seeps through the ____________ and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called ___________.

Answer:

The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called infiltration.

Question 16:

Fill in the blanks and complete the story selecting words from the box given here.

Cold, demand, leaders, dry, hot, scarcity, workers, wet, oceans, harvesting, and rivers

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

Answer:

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.

Question 17:

Place the following statements in a proper order to form a meaningful paragraph.

  1. Which in turn decreases the seepage of rain water into the ground?

  2. This decreases the open areas like park, and playgrounds.

  3. Increasing population create demand for construction of houses, shops, offices, roads and pavements.

  4. This results in depletion of water table and creates scarcity of more water.

Answer:

Question 18:

How can you observe the three forms of water in (i) nature and (ii) at home?

Answer:

  1. Nature - Snow, water, water vapour

  2. Home - Ice, water, steam