DAV Class 3 Science Chapter 10 Question Answer Water

DAV Class 3 Science Chapter 10 Water solutions from DAV textbook My Living World. Here you will find clear answers on natural sources of water (rain, snow, rivers), groundwater, dams, hydroelectricity, water bodies of India, and original textbook photos.

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Chapter Overview: Water (Class 3 Science)

Water is essential for the survival of all living beings. Plants need water to make food, while animals and humans need water for drinking, bathing, cooking, cleaning, and farming. Nature provides water through rain and snow melting from high mountain peaks.

A. Fill in the blanks.

1. Rain and snow are the main sources of water in nature.
Explanation: Rain refills rivers and lakes, while melting mountain snow feeds perennial rivers.

2. Rivers flow into a sea or an ocean.
Explanation: Rivers carry freshwater downstream across plains and empty into seas.

3. India is surrounded by Bay of Bengal on the east side.
Explanation: India is bounded by the Bay of Bengal in the east, the Arabian Sea in the west, and the Indian Ocean in the south.

4. A dam stores river water which is used to generate electricity.
Explanation: Massive concrete barriers built across rivers store reservoir water to drive hydro turbines.

5. Water in canals is used for irrigating the fields.
Explanation: Canals are man-made waterways constructed to divert river water to agricultural farms.

B. Write True or False for the following statements.

1. Snow is a natural source of water. — True
Reason: Mountain snow melts during sunny summer months and fills rivers like Ganga and Yamuna.

2. People draw water from a river using a hand pump. — False
Reason: Hand pumps are used to draw groundwater from underground water tables, not directly from rivers.

3. River water is purified for drinking purposes. — True
Reason: Water treatment plants filter, clean, and chlorinate river water before supplying it through city taps.

4. India is surrounded by Arabian Sea on the west side. — True
Reason: The Arabian Sea borders the western coastline of India.

5. Groundwater is used by plants for their growth. — True
Reason: Deep plant roots absorb underground soil moisture to nourish leaves and stems.

C. Tick the correct option.

1. Water present under the surface of the earth is called—
(a) tap water
(b) sea water
(c) ground water
(d) lake water
Answer: (c) ground water
Explanation: Rainwater that seeps deep into soil layers accumulates as underground water.

2. One of the main rivers of South India is—
(a) Ganga
(b) Yamuna
(c) Cauvery (or Godavari / Krishna)
(d) Indus
Answer: (c) Cauvery
Explanation: Cauvery, Godavari, and Krishna are major rivers flowing through South India.

3. On the southern side, India is surrounded by—
(a) Arabian Sea
(b) Bay of Bengal
(c) Indian Ocean
(d) Pacific Ocean
Answer: (c) Indian Ocean
Explanation: The mighty Indian Ocean borders India’s southern tip at Kanyakumari.

4. It dances in the rain.
(a) crow
(b) peacock
(c) parrot
(d) eagle
Answer: (b) peacock
Explanation: Peacocks spread their magnificent feathers and dance with joy when dark monsoon rainclouds gather.

5. Rivers get water mainly from—
(a) wells
(b) hand pumps
(c) rain and melting snow
(d) taps
Answer: (c) rain and melting snow
Explanation: Natural rainfall and melting Himalayan snowdrifts are the ultimate source of all river flow.

D. Answer the following questions in brief.

Question 1: Name two main natural sources of water.
Answer: Rain and Snow.

Question 2: Name any three inland water bodies.
Answer: Ponds, Lakes, and Rivers.

Question 3: Write one use of water in the canals.
Answer: Canal water is used for irrigating agricultural fields and farms, helping farmers grow food crops in areas with less rainfall.

Question 4: Name two main rivers of North India.
Answer: Ganga and Yamuna (also Indus and Brahmaputra).

Question 5: State two methods of drawing ground water.
Answer: Ground water can be drawn using:

Hand pumps and tube-wells
Open water wells (using a rope and bucket)

E. Answer the following questions.

Question 1: How is snow a source of water?
Answer: High mountain ranges receive heavy snowfall during winter, which covers mountain peaks with thick snowpacks. During warm summer months, the heat of the sun melts this snow into freshwater streams. These streams join together to form perennial rivers that flow throughout the year across the plains.

Question 2: How is a dam useful for generating electricity?
Answer: A dam is a massive wall built across a flowing river to hold back and store large volumes of water in an artificial reservoir. When this water is released from a great height through special gates, it falls with tremendous force onto big machines called water turbines. The spinning turbines drive electric generators to produce clean electricity, known as hydroelectricity.

Question 3: Why do plants look greener after rain?
Answer: Plants look remarkably greener and fresher after rainfall because:

Raindrops wash away the layer of dry dust, smoke, and dirt settled on the surface of green leaves.
The pure rainwater hydrates the leaves directly, allowing them to absorb clean sunlight and carry out photosynthesis vigorously.

Question 4: How is ground water useful?
Answer: Ground water is extremely useful because:

It serves as the cleanest natural source of sweet drinking water for millions of families through tube-wells and hand pumps.
It provides essential moisture to the roots of trees, crops, and wild vegetation during dry weather.

Question 5: Why are picnic spots often developed around or near lakes?
Answer: Lakes have calm, sparkling water, cool and soothing breezes, lush green gardens, and beautiful natural scenery. People love visiting lakes for relaxation, photography, fresh air, and enjoyable boating with family, making lakes ideal scenic picnic spots.