Assam SCERT Class 8 Geography and Economics Chapter 5 The Oceans and Seas Question Answer Solutions
Assam SCERT Board Class 8 Geography and Economics Chapter 5 The Oceans and Seas all Question’s easy Solutions by expert teachers.
Board |
Assam SCERT |
Class |
8 |
Book |
Geography and Economics |
Topic |
Question answer |
EXERCISE
1.) Write answers-
a.) What are the causes of ocean current?
Ans. The rotation of the earth,wind,water temperature, salinity, differences of pressure of the coastline etc are the different causes of the ocean current.
b.) What do you mean by warm water current?
Ans. The ocean water of equatorial region gets heated easily and expands. These currents flow from the Equator towards the poles are warmer than the surrounding water and are called as Warm Currents.
c.) What are the types of sea lives? On what basis are they classified?
Ans.The oceans are dwelling place of a wide range of lives from microorganisms to big animals. The sea plants and animals are categorized into three broad divisions according to their movement and habitats which are plank benthos and nekton. Plankton are divided into two types: Plant Plankton and animal plankton or Zoo plankton.
d.) Which are the suitable places for developing fishing grounds near the oceans?
Ans.The suitable places for developing fishing grounds near the oceans are the areas where the warm and cold current meet.The sea beds are filled with pebbles and sediments from the iceberg and resulting in the decrease in the level of sea bed. The sea beds are filled with plankton and suitable for the fishes and fishing ground.
2.) Give reasons-
a.) The neap tide is stronger than spring tide.
b.) Now Sea fishes are available everywhere for purchase.
c.) Japan has experiences of frequent Tsunami.
d.) Ship transportation is the best system for international trade.
e.) The tidal power of the sun is less though it is bigger in size.
3.) Choose the correct one-
i.) The rising and falling of ocean water twice daily is known as- Tide
a.) ocean current b. tide c. wave
ii.) Tsunami means – Waves
a). earthquake b. waves c. ports
iii.) The creatures of the ocean which can swim are- nekton
a.) nekton b. benthos c. plankton
4.) Match the following left side items with the right side-
a) Diatom is
b) In the equatorial region c) Common Salt d) In quadrature e) Fishing grounds
|
a) develop where planktons are available
b) neap tides occur. c) a kind of plant plankton. d) dissolved in ocean water e) density of water is less. |
Ans- a) Diatom is-a kind of plant plankton
b) In the equatorial region- density of water is less
c) Common Salt- dissolved in water
d) In quadrature- neap tides occur
e) fishing grounds- develop where planktons are available
EXTRA QUESTIONS:
1.) Why is earth called the ‘Blue Planet’?
Ans. The earth is mostly covered with water which is why it is called the ‘Blue Planet’.
2.) Why is the ocean water is saline?
Ans. The ocean water is saline as there are various minerals are dissolved inside it.
3.) How many oceans are there on the earth’s surface?
There are five oceans on the earth’s surface which are the Pacific, the Atlantic, the Indian Ocean, North seas and South seas.
4.) What is the direction of ocean currents?
Ans. The ocean currents always make upward and downward motion.
5.) What are the factors affecting the tide?
Ans The factors which affect the formation of tide are the gravitational force of the moon and the sun over the earth and the centrifugal force coming out from the earth’s rotation.
6.) What is the distance of the earth from the sun?
Ans. The distance of the earth from the sun is 14,96,00,000 km.
7.) Which technology is being used in the ships for finding the location of the fishing grounds?
Ans. The computerized technology is being used in the ships for finding the location of the fishing grounds.
8.) What is water transportation?
Ans. The seas and oceans provide transportation facilities which is known as Water transportation. It is easy and less costly mode of transportation.
9.) Fill in the blanks:
a.) Almost 71% of the earth’s surface of the earth is covered with water.
b.) 97% of the water of the hydrosphere is found in oceans and seas.
c.) The world famous ‘National Geographic’ has included the fifth ocean named the Southern Ocean.
d.) The Bay of Bengal touches the borders of India.
e.) The rise of the water due to the gravitational force of the moon is known as Primary tide.
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