Chapter 12- “ Our Water Wealth”

11.12.2015 Chapter 12- “ Our Water Wealth”

Q1. Why cannot sea water be used for drinking or irrigation?

Ans1. Sea water cannot be used for drinking or irrigation as it contains salt.

Q2. What problems occur in India because of rains occuring only in the monsoon months?

Ans2. Rivers are full of water during the monsoon months. Therefore, there are often floods during these months. The extra water simply flows into the sea and is not stored. On the other hand, many rivers dry up during the summer months because of shortage of water.

Q3. What is hydroelectricity?

Ans3. Electricity generated from the force of water is called HYDROELECTRICITY.

Chapter 11- “ Forests of India”

7.12.2015 Chapter 11- “ Forests of India”

Q1. What do you mean by 'natural vegetation' of an area?

Ans1. The kinds of trees and other plants that grow naturally in a region depending on the climate and soil of the place are called the natural vegetation of an area.

Q2. Name four useful products we get from forests.

Ans2. We get firewood, wood pulp, rubber and medicines from the forest.

Q3. Other than providing useful products, list three other ways in which forests are useful to us.

Ans3. Forests are useful to us in many ways:-

a) They provide shelter to wild animals.

b) They prevent soil erosion.

c)They supply oxygen to air.

Q4. What was Chipko movement?

Ans4. In 1974, villagers in the hills of Uttrakhand took steps to prevent deforestation in a unique way. They prevented cutting down of trees by putting their arms around the trees and refusing to move. This was known as the Chipko Movement.