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SEBA Class 8 Social Science Chapter 5 The Oceans and Seas
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The Oceans and Seas
| Exercise |
1. Write answers:
(a) What are the causes of ocean current?
Ans: The rotation of the earth, wind, water temperature, salinity and differences of pressure of the coastline etc. are the factors responsible for ocean currents.
(b) What do you mean by warm water current?
Ans: The warm ocean water of the equatorial region flows to the colder region as surface current. This is called the warm water current.
(c) What are the types of sea lives? On what basis are they classified?
Ans: Sea plants and animals are divided into three categories depending on their movement and habitats. These are plankton, benthos and nekton.
(d) Which are the suitable places for developing fishing grounds near the oceans?
Ans: The places where warm and cold ocean currents meet are considered as valuable fishing grounds.
2. Give reasons:
(a) The neap tide is not stronger than spring tide.
Ans: When the sun and the moon are in quadrature i.e. both of them are in rectangular position, the attraction of the moon as well as the sun is reduced. The tides produced in it are lower than that of ordinary tides. This is known as Neap Tide.
(b) Now sea fishes are available everywhere for purchase.
Ans: Now days computerised technology have been used in the ships for finding out the location of fishing grounds, fishing activities, conservation of fishes, packaging and supplying etc. Now fishes packed in tins are available everywhere.
(c) Japan has experiences of frequent Tsunami.
Ans: The entire Japan is situated in the Ring of Fire belt of the pacific. This is one of the most earthquake prone areas of the world. Hence Japan is experiencing frequent earthquake and Tsunami.
(d) Ship transportation is the best system for international trade.
Ans: Water transport is an easy and cheap transportation system. Since the waterways are natural, no expenditure is spent for it and the ships and cargos can easily carry huge quantity of goods and passengers. The cost of fuel is comparatively less here. Therefore water transport is very suitable regarding international trade.
(e) The tidal power of the sun is less though it is bigger in size.
Ans: Though the size of the sun is bigger than that of the earth and the moon, its distance from the earth is very high. Therefore the tidal power of the sun is less than the moon.
3. (i) Choose the correct one:
(a) Polar region.
(b) Equatorial region.
(c) None.
Ans: (b) Equatorial region.
(ii) The rising and falling of ocean water twice daily is known as-
(a) Ocean current.
(b) Tide.
(c) Wave.
Ans: (b) Tide.
(iii) Tsamami means-
(a) Earthquake.
(b) Waves.
(c) Ports.
Ans: (c) Ports.
(iv) The creatures of the ocean which can swim are –
(a) nekton.
(b) benthos.
(c) plankton.
Ans: (a) nekton.
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SEBA Class 8 Social Science Textual [New Edition Updated]
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