Water: A Natural Resource

Q.

Why water is necessary for living organisms ? Explain.

Q. _____ covers 75% of the Earth's surface.

1. Air
2. Water
3. Soil
4. Rocks

Q.

Why water should be used judiciously ?

Q. Most of the fresh water on Earth surface is found in:

1. underground
2. oceans
3. glaciers
4. rivers

Q. About 97% of water on earth's surface is found in .

1. rivers
2. oceans
3. glacier
4. lakes

Q.

Water is essential for all life processes. True or false

1. False

2. True

Q.

The air blanket surrounding the Earth is called hydrosphere.

1. True

2. False

Q.

Why Do Some Rivers Change Their Course?

Q. Question 21
Total earth’s surface covered by water is

(a) 75%
(b) 60%
(c) 85%
(d) 50%

Q.

The percentage of the Earth's surface covered by water is approximately:

1. 75%
2. 85%
3. 60%
4. 50%

Q. Which factors affect the biodiversity of a particular region?

1. The amount of water
2. Temperature
3. Nature of soil
4. All the above

Q.

State the importance of Hydrosphere as one of the domains of the Earth?

Q.

The process of changing water vapour into water is called _________________.

Q.

Draw a diagram to show how sea water reaches a lake or pond.

Q.

Water is essential for all life processes.

1. True

2. False

Q.

Question 21
Total Earth’s surface covered by water is

(a) 75%
(b) 60%
(c) 85%
(d) 50%

Q.

Mention two functions of multipurpose dams.

Q. Question 3
How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?

Q.

The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene per person per day is a minimum of

1. $5$ litres

2. $15$ litres

3. $30$ litres

4. $50$ litres

Q.

What is the major source of fresh water in the city/town where you live?

Q.

Name two fresh water sources which provide fresh water for human use.

Q. In very low temperatures, precipitation generally occurs in the form of ____, ____ or _____.

1. rain
2. snow
3. sleet
4. hail

Q.

Identify the incorrect statement.

1. In our body, all cellular processes take place in a water medium

2. All the reactions that take place within our body and within the cells occur between substances that are dissolved in water

3. In our body, substances are transported from one part to the other in a dissolved form

4. Our body does not need to maintain the level of water within their bodies

Q.

Most of the fresh water lakes are located in which mountain range?

Q.

24. Explain, with examples, why water is essential for all living things.

Q. Most of the fresh water on Earth surface is found in:

1. underground
2. oceans
3. glaciers
4. rivers

Q. Match the following columns and select the correct option.

$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{a. Itai-itai idsease}& \text{(i) Arsenic}\\ \text{b. Minamata disease}& \text{(ii) Lead}\\ \text{c. Plumbism}& \text{(iii) Cadmium}\\ \text{d. Black foot disease}& \text{(iv) Mercury}\end{array}$

1. a(iv), b(ii), c(i), d(iii)
2. a(i), b(iv), c(iii), d(ii)
3. a(iii), b(iv), c(ii), d(i)
4. a(ii), b(i), c(iii), d(iv)

Q.

Why do organisms need water? [1 MARK]

Q.

Give one word for :

Repeated evaporation and condensation of water take place in nature.

Q. Water is essential to maintain body temperature for terrestrial organisms.

1. False
2. True