Importance of Water

Q.

Mention three ways in which we can conserve water. [3 MARKS]

Q.

We use water in our daily lives for activities like bathing, washing clothes and utensils, drinking, etc. Mention two other uses of water. [2 MARKS]

Q.

How do we use thermodynamics in everyday life?

Q.

Do all organisms need water?

Q.

List some activities for which you need water on a daily basis.

Q.

Give any three important uses of water.

Q.

What is the importance of water in the life process of animals and plants?

Q.

4. If we do not drink enough water, what will happen to our body ?

Q. Explain the physical properties of water

Q.

No rainfall for a year or more may lead to _________________ in that region.

Q. Iron oxide has formula $F{e}_{0.96}{O}_{1.00}$. What fraction of Fe exists as $F{e}^{+2}\text{and}F{e}^{+3}$ ions?

Q. Why is water useful for life on the earth?
(i) It maintains ecological balance.
(ii) It sustains life.
(iii) It is necessary for respiration in aquatic organisms.

1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. (i), (ii) and (iii)

Q. Which amongst the following food items is rich in water content?

1. 
2. 
3. 
4. 

Q. In which activity will you use less water than the other?

1. Taking a shower
2. Mopping the floor
3. Washing clothes
4. Brushing teeth

Q.

Rainwater seeps down through the soil and gets collected to form__________.

1. Surface water

2. Runoff water

3. Groundwater

4. Freshwater

Q.

Write a short note on the different sources of water on Earth.

Q.

Why is the cultivation of crops favourable along river banks?

1. More sun is available along the river banks.

2. Water along river banks is pure.

3. Crops get a good supply of water throughout the year for their growth.

4. None of these.

Q.

Water helps in maintaining the body temperature.

1. True
2. False

Q. Seventy percent of the human body is made up of .

1. flesh
2. blood
3. water
4. bones

Q. When water is converted to ice, its volume ___ and density ____.

1. decreases, increases
2. increases, decreases
3. decreases, decreases
4. increases, increases

Q.

Why is water hyacinth harmful to fish?

Q. Potable water is fit for human consumption.

1. False
2. True

Q.

Give any three important uses of water.

Q. Out of our total body weight, about two-thirds is made up of water and it is important to have a regular intake of water. This is because:

1. water has lots of vitamins and proteins
2. water conducts heat very fast and thereby maintains the body temperature
3. water can dissolve a lot of substances
4. water is stored as energy in our body

Q. The water is used:

1. for drinking
2. for cooking
3. maintaining proper hygiene
4. all of the above

Q. A solid popsicle changes into liquid by the process of

1. melting
2. condensation
3. evaporation
4. boiling

Q.

Why is water useful to life on the earth?
(i) It maintains ecological balance.
(ii) It sustains life.
(iii) It is necessary for respiration in aquatic organisms.

1. Only (i) and (ii)

2. Only (ii) and (iii)

3. Only (i) and (iii)

4. (i) , (ii) and (iii)

Q.

Select the activities that require the use of freshwater.

1. Brushing teeth
2. Bathing
3. Washing clothes
4. Watching television

1. 
   2 and 3
2. 
   1, 2, 3, and 4
3. 
   1, 2, and 3
4. 
   1 and 2

Q. Water provides energy to all living organisms.

1. True
2. False

Q. Sea water contains dissolved oxygen which is utilized by animals and plants for respiration.

1. True
2. False