Water Resources, Chapter 3 Contemporary India II | NCERT - CBSE Guide Class 10, Geography - solved additional important questions


Class 10 NCERT Social (Geography) | CBSE Guide


Solved Additional Important Questions - CBSE Sample Questions Answers
Question: Suggest some measures to conserve water. OR
Write a short proposal on how you can conserve water. OR
How water can be conserved?
Answer: Although water is a renewable resource but fresh water is the most precious substance on this earth. Various measures of water conservation are:
1. Rain water harvesting and water shed development.
2. Preventing wastage of water by ensuring that there are no leakages in the water tanks, canals are properly lined etc.
3. Using appropriate methods of irrigation like - drip system, sprinkler system etc.
4. By controlled use of agricultural chemicals like - fertilizers, pesticides etc.
5. Treatment of industrial effluents and sewage water before they are released into a river.
6. By construction of river valley projects.
7. By inter-basin transfer of water.
8. By using water judiciously in the houses and at public facilities.

Question: Give examples to show that water harvesting was practiced in ancient times also.
Answer: There are many examples which show that water harvesting in ancient times also:
1. In the 1st century B.C, Sringaverapura near Allahabad had sophisticated water harvesting system for flood water of river Ganga.
2. Dams, lakes, and irrigation systems were built during the time of Chandragupta Maurya.
3. In the 14th century a tank in Hauz Khas, Delhi was built by Iltutmish to supply water to Siri Fort area.    

Question: Give some objectives of rain water harvesting.
Answer: The main objectives of rain water harvesting are -
1. To meet increasing demand of water or as a solution of water scarcity.
2. To raise ground water level.
3. To reduce run-off and flooding of roads.
4. To save fresh water from getting polluted.
5. To minimize the dependability on existing water resources.    

Question: Which is the only state in India where all the houses have rooftop rain water harvesting system?
Answer: Tamil Nadu, where government has made it compulsory for all the houses to have rain water harvesting structures.

Question: Name some of the states in India where rain water harvesting is practiced.
Answer: These states are Meghalaya, Tamil Nadu, Rajasthan, and Gujarat.

Question: What is the term used for rain water harvesting in Rajasthan?
Answer: In Rajasthan, rain water harvesting system is known as Johads.  

Question: What is a multipurpose river valley project?
Answer: A multipurpose river valley project is a scheme which is carried out to fulfill a number of purposes at the same time such as, irrigation, electricity generation, flood control, amusement, inland navigation, and fish breeding. For example, Bhakra Nangal Project on river Sutlej.

Question: Give the percentage of water that exists in oceans and as fresh water out of the total volume of the world’s water?
Answer: Out of the total volume of the world’s water –
(a) 96.5% exists in oceans.
(b) 2.5% exists as fresh water.

Question: Give the distribution of fresh water on the earth’s surface.  
(a) Nearly 7% of fresh water occurs as ice sheets and glaciers in Antarctica, Greenland and the mountainous regions of the world.
(b) Less than 30% is stored as ground water in world’s aquifers. 

Question: What is the Bamboo Drip Irrigation system? In which state of India do we find this type of irrigation?
Answer: Bamboo Drip Irrigation system is a 200 tear old system of tapping stream and spring water by using bamboo pipes. This water gets transported over hundreds of meters and finally releases the water in drops at the site of the plant.
Bamboo Drip Irrigation system can be seen in Meghalaya. 
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