Enjoy with Social Life-4 [74-105] - School Books Publishers India

5. What are the Sunderbans? How do they get their name?Ans. In the delta of the Ganga these forests are called Sunderbans which arenamed after Sundari trees.6. Why are deciduous forests also called monsoon forests?Ans. Deciduous forests are also known as Monsoon forests because theyshed their leaves during the dry season and become green at the arrivalof monsoon.7. Why are tropical forests also called evergreen forests?Ans. The trees of tropical forests always remain green throughout the year.They do not shed their leaves at the same time. So these forests arecalled evergreen forests.Project/Activity :F. 1. Draw the pictures of different trees found in different type of forests.Ans. Do yourself.2. Make a list of trees found in these forests under each heading.Ans. Do yourself.9. Our Water ResourcesExerciseA. Fill in the blanks :1. The biggest canal in India is Indira Gandhi Canal.2. Wells and tubewells are the oldest means of irrigation in India.3. We draw water from a well using rope and pulley.4. Dams are built across rivers to regulate the water.5. About 70% of the earth's surface is covered with water.B. Write True or False :1. Water is the most important gift of nature. True2. Canals are natural waterways. False3. A dam is a barrier to control the flow of water. True4. The word hydro means 'water'. True5. We should not conserve our water resources. TrueC. Match the following :1. Canal (a) Electricity from water2. Tank (b) A dam which serve many purposes3. Well (c) A barrier to control the flow of a river4. Multi-purposeproject(d) Underground water5. Dam (e) Artificial waterways6. Hydro-electricity (f) Large reservoirsD. Answer the following questions :1. What is the main source of water?Ans. Rain is the main source of water.2. What are the various means of irrigation?Ans. Various means of irrigation are tubewells, rivers, canals, dams, tanksand wells.85Bookman India Enjoy with Social Life [1-5]