Water Extra Questions Chapter 5 Class 7 Geography
Chapter 5 Water Extra Questions for Class 7 Geography will be useful in knowing how questions can be framed in the examinations and prepare accordingly. Class 7 Extra Questions will guide students to act in a better way an frame better answers in the exams.
Chapter 5 Water Very Short Answer Questions (VSAQs):
1. Which day is celebrated as world water day?
Answer
22nd march.
2. Why is the ocean water saline?
Answer
The ocean water is saline as it contains large amount of dissolved salts.
3. _____ is the southernmost point of India.
Answer
Indira Point.
4. Salinity is the amount of salt in grams present in _____ grams of water.
Answer
1000.
5. Rapid withdrawal of water from the coastal region gives the warning of ______.
Answer
Tsunami.
6. _____ are formed when gentle winds scraps across the ocean surface.
Answer
Tsunami.
7. The ______ of earth surface is covered by water.
Answer
Three-Fourth.
8. How is ocean water different from waters of ponds and lakes?
Answer
Water of ponds and lakes is calm and still but ocean water keeps moving continuously.
9. What do you mean by the term 'salinity'?
Answer
The amount of salts present in the sea or ocean water is called salinity.
10. What is water cycle?
Answer
The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.
11. An artificial enclosure for keeping small house plants is called ______.
Answer
Terrarium.
12. Which ocean is the deepest of all oceans?
Answer
The Pacific Ocean is the deepest of all oceans.
13. What is flood tide and ebb tide?
Answer
The rise of sea level is called the flood tide and fall is called the ebb tide.
14. What is ocean wave?
Answer
When the water on the surface of the ocean rises and falls alternatively they are called waves.
15. What is an ocean current?
Answer
Ocean currents are stream of water flowing constantly on the ocean surface in definite direction.
16. Why ocean bodies and sea contain salty water?
Answer
Because it contains the large amount of dissolved salts. Most of the salt is sodium chloride.
Chapter 5 Water Short Answer Questions (SAQs):
1. Distinguish between high tide and low tide.
Answer
• The rise in the water level is called the high tide while the fall in the water level is called the low tide.
• In high tide, water covers much of the shore by rising to its highest level. In low tide, water falls to its lowest level and recedes from the shore.
2. Define vertical distribution of sea water.
Answer
When surface water gets heated by sun, water evaporates and increases the concentration of salts. Surface water becomes denser sinks and sub surface water rises up. Thus, salinity of sea water causes vertical circulation.
3. Name the two types of ocean current and its movement on earth.
Answer
Two types of ocean currents are warm and cold currents. The warm currents flow from low latitudes in tropical zones towards the high latitudes in the temperate and sub polar zones. The cold current flow from high latitudes to low latitudes.
4. Why is the quality of water deteriorating day by day?
Answer
The quality of water is deteriorating due to:
• We often get water from polluted sources. The Ganga is an example of a very polluted river which provides water to millions.
• Water is often recycled. It means sewage is treated and released into a water body. The same water is used again.
• Many factories release untreated wastes into rivers. This is a major concern.
5. How tides are formed?
Answer
Tides are periodic rise and fall in the level of water in seas and ocean caused by the attraction of the moon and the sun. Twice a day, about every 12 hours and 26 minutes, the sea level rise and it falls.
6. Our unique planet earth is covered by different categories of water. Give the distribution of water in percentage.
Answer
The three fourth of the earth surface is covered by water. Water plays a major role on the earth surface for the survival of different modes of life. The different categories of the water according to their catchment area are Ocean 97%, ice caps 02.0%, ground water 0.68%, fresh water 0.009%, Inland seas and salt lakes 0.009%, atmosphere 0.0019%, rivers 0.0001%.
7. Suggest some some measures through which water can be conserved.
Answer
• By turning off the tap when you brush your teeth.
• Placing a cistern displacement device in your toilet cistern to reduce the volume of water used in each flush.
• Taking a shorter shower.
• Watering garden with a watering can rather than a hosepipe.
8. How ae high tides helpful in navigation and fishing?
Answer
High tides help in navigation. They raise the water level close to the shores. This helps the ships to arrive at the harbour more easily. The high tides also help in fishing. Many more fish come closer to the shore during the high tides. This enables fishermen to get a plentiful catch.
Chapter 5 Water Long Answer Questions (LAQs):
1. The movement of ocean water takes place in three different. Explain them.
Answer
The movement of ocean water takes place in three different ways. These are:
• Waves: When the water on the surface of the ocean rises and falls alternately, they are called waves. Waves are formed in the seas and oceans when wind blows across the water surface. The shape and size of the wave depend on the speed of the winds. The stronger the wind blows, the bigger the wave becomes. During a storm, the winds blowing at very high speed from huge waves may cause tremendous destruction.
• Tides: The continual rise and fall of ocean water is called a tide. The rise in the water level is high tide, when water falls to its lowest level and recedes from the shore it is called low tide. Tides help in fishing, navigation and trade. The rise and fall of water due to tides is being used to generate electricity in some places.
• Ocean currents: These are streams of water flowing constantly on the ocean surface in definite directions. There are two types of ocean currents- warm and cold. The warm ocean currents originate near the equator and move towards the poles. For example, the Gulf stream. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. For example, the Labrador Ocean Current.